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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html lang="EN" xmlns="http://www.w3.org/1999/xhtml"><head><meta content="text/html; charset=utf-8" http-equiv="Content-Type"/><title>XML Schema Part 2: Datatypes Second Edition</title><style type="text/css">
code           { font-family: monospace; }

div.constraint,
div.issue,
div.note,
div.notice     { margin-left: 2em; }

ol.enumar      { list-style-type: decimal; }
ol.enumla      { list-style-type: lower-alpha; }
ol.enumlr      { list-style-type: lower-roman; }
ol.enumua      { list-style-type: upper-alpha; }
ol.enumur      { list-style-type: upper-roman; }


div.exampleInner pre { margin-left: 1em;
                       margin-top: 0em; margin-bottom: 0em}
div.exampleOuter {border: 4px double gray;
                  margin: 0em; padding: 0em}
div.exampleInner { background-color: #d5dee3;
                   border-top-width: 4px;
                   border-top-style: double;
                   border-top-color: #d3d3d3;
                   border-bottom-width: 4px;
                   border-bottom-style: double;
                   border-bottom-color: #d3d3d3;
                   padding: 4px; margin: 0em }
div.exampleWrapper { margin: 4px }
div.exampleHeader { font-weight: bold;
                    margin: 4px}

   img { color: white; border: none }
   span.nav { float: right}
   span.arrow { font-style: normal; font-weight: bold }
   code { font-family: monospace; font-size: 100%}
   span.propdef { font-weight: bold; font-family: monospace }
   span.termdef {color: #850021}
   a.termref:visited, a.termref:link {font-family: sans-serif;
	     font-style: normal;
	     color: black;
	     text-decoration: none }
   a.eltref:visited, a.eltref:link { font-family: sans-serif;
	     color: black;
	     text-decoration: none }
   a.propref:visited, a.xpropref:visited, a.propref:link, a.xpropref:link { color: black; text-decoration: none;
			  font-family: sans-serif }
   dl.props, dl.psvi {margin-bottom: .5em; margin-top: 0em}
   div.toc1 {margin-left: 5ex}
   div.toc2 {margin-left: 2ex}
   div.tocLine{margin: 0em; text-indent: -6ex}
   h3.withToc {margin-bottom: 0em}
   div.constraintnote { margin-top: 1em }
   div.constraint {
     margin-left: 1em; }
   
   div.constraintlist {
     margin-left: 1em; margin-bottom: 0em
   }
   div.clnumber {
     text-indent: -1em;
     margin-top: 0em; margin-bottom: 0em }
   
   div.schemaComp { border: 4px double gray;
		    margin: 0em 1em; padding: 0em }
   div.compHeader { margin: 4px;
		   font-weight: bold }
   span.schemaComp { color: #A52A2A }
   div.compBody {
		 border-top-width: 4px;
		 border-top-style: double;
		 border-top-color: #d3d3d3;
		 padding: 4px ; margin: 0em}
   
   div.psviDef { border: 4px double gray;
		    margin: 1em 1em; padding: 0em }
   div.psviHeader { margin: 4px;
		   font-weight: bold }
   span.psviDef { color: #A52A2A }
   div.psviBody { border-top-width: 4px;
		 border-top-style: double;
		 border-top-color: #d3d3d3;
		 padding: 4px ; margin: 0em}
   
   div.reprdef { border: 4px double gray;
		    margin: 0em 1em; padding: 0em }
   div.reprHeader { margin: 4px;
		   font-weight: bold }
   span.reprdef { color: #A52A2A }
   div.reprBody, div.reprcomp, div.reprdep {
		 border-top-width: 4px;
		 border-top-style: double;
		 border-top-color: #d3d3d3;
		 padding: 4px ; margin: 0em}
   table.reprcomp { margin-bottom: -.5em}
   p.element-syntax-1 { font-family: monospace;
		       margin-top: 0em; margin-bottom: .5em }
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		 border-top-width: 1px;
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<h1><a id="title" name="title"/>XML Schema Part 2: Datatypes Second Edition</h1>
<h2><a id="w3c-doctype" name="w3c-doctype"/>W3C Recommendation 28 October 2004</h2>
<!--* 
<h2><a id="w3c-doctype" name="w3c-doctype"/>W3C Recommendation 2 May 2001, Second Edition 28 October 2004</h2>
*-->
<dl><dt>This version:</dt><dd> <a href="http://www.w3.org/TR/2004/REC-xmlschema-2-20041028/">http://www.w3.org/TR/2004/REC-xmlschema-2-20041028/</a> </dd><dt>Latest version:</dt><dd>
	<a href="http://www.w3.org/TR/xmlschema-2/">
		http://www.w3.org/TR/xmlschema-2/
	</a>
</dd><dt>Previous version:</dt><dd>
	<a href="http://www.w3.org/TR/2004/PER-xmlschema-2-20040318/">http://www.w3.org/TR/2004/PER-xmlschema-2-20040318/</a>
</dd><dt>Editors:</dt>
<dd>Paul V. Biron, Kaiser Permanente, for Health Level Seven <a href="mailto:Paul.V.Biron@kp.org">&lt;Paul.V.Biron@kp.org&gt;</a></dd>
<dd>Ashok Malhotra, Microsoft (formerly of IBM) 
<a href="mailto:ashokma@microsoft.com">&lt;ashokma@microsoft.com&gt;</a> 
</dd>
</dl>
<p>Please refer to the <a href="http://www.w3.org/2004/03/xmlschema-errata"
><strong>errata</strong></a> 
for this document, which may include some normative corrections.</p>
<p>This document is also available in these non-normative formats: <a href="http://www.w3.org/TR/2004/REC-xmlschema-2-20041028/datatypes.xml">XML</a>, <a href="http://www.w3.org/TR/2004/REC-xmlschema-2-20041028/datatypes-with-errata.html">XHTML with visible change markup</a>, <a href="http://www.w3.org/2001/XMLSchema.xsd">Independent copy of the schema for schema documents</a>, <a href="http://www.w3.org/2001/XMLSchema-datatypes.xsd">A schema for built-in datatypes only, in a separate namespace</a>, and&#xa0;<a href="http://www.w3.org/2001/XMLSchema.dtd">Independent copy of the DTD for schema documents</a>.
See also <a
href="http://www.w3.org/2003/03/Translations/byTechnology?technology=xmlschema"
><strong>translations</strong></a>.</p>
<p class="copyright"><a href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a>&#xa0;&#xa9;&#xa0;2004&#xa0;<a href="http://www.w3.org/"><acronym title="World Wide Web Consortium">W3C</acronym></a><sup>&#xae;</sup> (<a href="http://www.csail.mit.edu/"><acronym title="Massachusetts Institute of Technology">MIT</acronym></a>, <a href="http://www.ercim.org/"><acronym title="European Research Consortium for Informatics and Mathematics">ERCIM</acronym></a>, <a href="http://www.keio.ac.jp/">Keio</a>), All Rights Reserved. W3C <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>, <a href="http://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a> and <a href="http://www.w3.org/Consortium/Legal/copyright-documents">document use</a> 
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rules apply.</p></div><hr/><div>
<h2><a id="abstract" name="abstract"/>Abstract</h2><p>
<em>XML Schema: Datatypes</em> is part 2 of the specification of the XML
Schema language. It defines facilities for defining datatypes to be used
in XML Schemas as well as other XML specifications.
The datatype language, which is itself represented in
XML 1.0, provides a superset of the capabilities found in XML 1.0
document type definitions (DTDs) for specifying datatypes on elements
and attributes.
</p></div><div>
<h2><a id="status" name="status"/>Status of this Document</h2><p><em>This section describes the status of this document at the
time of its publication. Other documents may supersede this document.
A list of current W3C publications and the latest
revision of this technical report can be found in the <a href="http://www.w3.org/TR/">W3C technical reports index</a> at
http://www.w3.org/TR/.</em></p><p>This is a <a href="http://www.w3.org/2004/02/Process-20040205/tr.html#RecsW3C">W3C
Recommendation</a>, which forms part of the Second Edition of XML
Schema. This document has been reviewed by W3C Members and
other interested parties and has been endorsed by the Director as a
W3C Recommendation. It is a stable document and may be used as
reference material or cited as a normative reference 
from another document. 
W3C's role in making the Recommendation is to draw attention
to the specification and to promote its widespread deployment. This
enhances the functionality and interoperability of the Web. 
</p><p>
This document has been produced by the <a href="http://www.w3.org/XML/Schema">W3C XML Schema Working Group</a>
as part of the W3C <a href="http://www.w3.org/XML/Activity">XML
Activity</a>. The goals of the XML Schema language are discussed in
the <a href="http://www.w3.org/TR/NOTE-xml-schema-req">XML Schema
Requirements</a> document. The authors of this document are the
members of the XML Schema Working Group.  Different parts of this
specification have different editors.
</p><p>
This document was produced under the <a href="http://www.w3.org/TR/2002/NOTE-patent-practice-20020124">24
January 2002 Current Patent Practice (CPP)</a> as amended by the <a href="http://www.w3.org/2004/02/05-pp-transition">W3C Patent Policy
Transition Procedure</a>. The Working Group maintains a <a href="http://www.w3.org/2002/11/xml-schema-IPR-statements.html">public
list of patent disclosures</a> relevant to this document;
that page also includes instructions for disclosing a patent. 
An individual who
has actual knowledge of a patent which the individual believes
contains Essential Claim(s) with respect to this specification should
disclose the information in accordance with <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#sec-Disclosure">section 
6 of the W3C Patent Policy</a>.
</p><p>The English version of this specification is the only normative
version. Information about translations of this document is available
at <a href="http://www.w3.org/2001/05/xmlschema-translations">http://www.w3.org/2001/05/xmlschema-translations</a>.</p><p>This second edition is <em>not</em> a new version,
it merely incorporates the changes dictated by the corrections to
errors found in the <a href="http://www.w3.org/TR/2001/REC-xmlschema-2-20010502/">first
edition</a> as agreed by the XML Schema Working Group, as a
convenience to readers.  A separate list of all such corrections is
available at <a href="http://www.w3.org/2001/05/xmlschema-errata">http://www.w3.org/2001/05/xmlschema-errata</a>. 
</p><p>The errata list for this second edition is available at <a href="http://www.w3.org/2004/03/xmlschema-errata">http://www.w3.org/2004/03/xmlschema-errata</a>.</p><p>
Please report errors in this document to <a href="mailto:www-xml-schema-comments@w3.org">www-xml-schema-comments@w3.org</a> 
(<a href="http://lists.w3.org/Archives/Public/www-xml-schema-comments/">archive</a>).
</p>
<div class="note"><b>Note:&#xa0;</b>Ashok Malhotra's 
affiliation has changed since the completion of
editorial work on this second edition. He is now at Oracle, and can be
contacted at <a href="mailto:ashok.malhotra@oracle.com"
>&lt;ashok.malhotra@oracle.com&gt;</a>.
</div>
</div><div class="toc">
<h2><a id="contents" name="contents"/>Table of Contents</h2><p class="toc">1 <a href="#Intro">Introduction</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;1.1 <a href="#purpose">Purpose</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;1.2 <a href="#requirements">Requirements</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;1.3 <a href="#scope">Scope</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;1.4 <a href="#terminology">Terminology</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;1.5 <a href="#constraints-and-contributions">Constraints and Contributions</a><br/>
2 <a href="#typesystem">Type System</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;2.1 <a href="#datatype">Datatype</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;2.2 <a href="#value-space">Value space</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;2.3 <a href="#lexical-space">Lexical space</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;2.4 <a href="#facets">Facets</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;2.5 <a href="#datatype-dichotomies">Datatype dichotomies</a><br/>
3 <a href="#built-in-datatypes">Built-in datatypes</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;3.1 <a href="#namespaces">Namespace considerations</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;3.2 <a href="#built-in-primitive-datatypes">Primitive datatypes</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;3.3 <a href="#built-in-derived">Derived datatypes</a><br/>
4 <a href="#datatype-components">Datatype components</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;4.1 <a href="#rf-defn">Simple Type Definition</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;4.2 <a href="#rf-fund-facets">Fundamental Facets</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;4.3 <a href="#rf-facets">Constraining Facets</a><br/>
5 <a href="#conformance">Conformance</a><br/>
</p>
<h3><a id="appendices" name="appendices"/>Appendices</h3><p class="toc">A <a href="#schema">Schema for Datatype Definitions (normative)</a><br/>
B <a href="#dtd-for-datatypeDefs">DTD for Datatype Definitions (non-normative)</a><br/>
C <a href="#d0e11239">Datatypes and Facets</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;C.1 <a href="#app-fundamental-facets">Fundamental Facets</a><br/>
D <a href="#isoformats">ISO 8601 Date and Time Formats</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;D.1 <a href="#formatdetails">ISO 8601 Conventions</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;D.2 <a href="#truncatedformats">Truncated and Reduced Formats</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;D.3 <a href="#deviantformats">Deviations from ISO 8601 Formats</a><br/>
E <a href="#adding-durations-to-dateTimes">Adding durations to dateTimes</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;E.1 <a href="#d0e11648">Algorithm</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;E.2 <a href="#adding-durations-to-instants-commutativity-associativity">Commutativity and Associativity</a><br/>
F <a href="#regexs">Regular Expressions</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;F.1 <a href="#charcter-classes">Character Classes</a><br/>
G <a href="#normative-glossary">Glossary (non-normative)</a><br/>
H <a href="#biblio">References</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;H.1 <a href="#normative-biblio">Normative</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;H.2 <a href="#non-normative-biblio">Non-normative</a><br/>
I <a href="#acknowledgments">Acknowledgements (non-normative)</a><br/>
</p></div><hr/><div class="body"><div class="div1">
<h2><a id="Intro" name="Intro"/>1 Introduction</h2><div class="div2">
<h3><span class="nav"> <a class="nav" href="#requirements"><img src="next.jpg" alt="next sub-section"/></a></span><a id="purpose" name="purpose"/>1.1 Purpose</h3><p>
The <a href="#XML">[XML 1.0 (Second Edition)]</a> specification defines limited
facilities for applying datatypes to document content in that documents
may contain or refer to DTDs that assign types to elements and attributes.
However, document authors, including authors of traditional
<em>documents</em> and those transporting <em>data</em> in XML,
often require a higher degree of type checking to ensure robustness in
document understanding and data interchange.
</p><p>
The table below offers two typical examples of XML instances
in which datatypes are implicit: the instance on the left
represents a billing invoice, the instance on the
right a memo or perhaps an email message in XML.
</p><table border="1" class="dtdemo"><thead><tr><th>Data oriented</th><th>Document oriented</th></tr></thead><tbody><tr><td>
<pre>&lt;invoice&gt;
  &lt;orderDate&gt;1999-01-21&lt;/orderDate&gt;
  &lt;shipDate&gt;1999-01-25&lt;/shipDate&gt;
  &lt;billingAddress&gt;
   &lt;name&gt;Ashok Malhotra&lt;/name&gt;
   &lt;street&gt;123 Microsoft Ave.&lt;/street&gt;
   &lt;city&gt;Hawthorne&lt;/city&gt;
   &lt;state&gt;NY&lt;/state&gt;
   &lt;zip&gt;10532-0000&lt;/zip&gt;
  &lt;/billingAddress&gt;
  &lt;voice&gt;555-1234&lt;/voice&gt;
  &lt;fax&gt;555-4321&lt;/fax&gt;
&lt;/invoice&gt;</pre>
</td><td>
<pre>&lt;memo importance='high'
      date='1999-03-23'&gt;
  &lt;from&gt;Paul V. Biron&lt;/from&gt;
  &lt;to&gt;Ashok Malhotra&lt;/to&gt;
  &lt;subject&gt;Latest draft&lt;/subject&gt;
  &lt;body&gt;
    We need to discuss the latest
    draft &lt;emph&gt;immediately&lt;/emph&gt;.
    Either email me at &lt;email&gt;
    mailto:paul.v.biron@kp.org&lt;/email&gt;
    or call &lt;phone&gt;555-9876&lt;/phone&gt;
  &lt;/body&gt;
&lt;/memo&gt;</pre>
</td></tr></tbody></table><p>
The invoice contains several dates and telephone numbers, the postal
abbreviation for a state
(which comes from an enumerated list of sanctioned values), and a ZIP code
(which takes a definable regular form).  The memo contains many
of the same types of information: a date, telephone number, email address
and an &quot;importance&quot; value (from an enumerated
list, such as &quot;low&quot;, &quot;medium&quot; or &quot;high&quot;).  Applications which process
invoices and memos need to raise exceptions if something that was
supposed to be a date or telephone number does not conform to the rules
for valid dates or telephone numbers.
</p><p>
In both cases, validity constraints exist on the content of the
instances that are not expressible in XML DTDs.  The limited datatyping
facilities in XML have prevented validating XML processors from supplying
the rigorous type checking required in these situations.  The result
has been that individual applications writers have had to implement type
checking in an ad hoc manner.  This specification addresses
the need of both document authors and applications writers for a robust,
extensible datatype system for XML which could be incorporated into
XML processors.  As discussed below, these datatypes could be used in other
XML-related standards as well.
</p></div><div class="div2">
<h3><span class="nav"><a class="nav" href="#purpose"><img src="previous.jpg" alt="previous sub-section"/></a> <a class="nav" href="#scope"><img src="next.jpg" alt="next sub-section"/></a></span><a id="requirements" name="requirements"/>1.2 Requirements</h3><p>
The <a href="#schema-requirements">[XML Schema Requirements]</a> document spells out
concrete requirements to be fulfilled by this specification,
which state that the XML Schema Language must:
</p><ol class="enumar"><li>
provide for primitive data typing, including byte, date,
integer, sequence, SQL and Java primitive datatypes, etc.;
</li><li>
define a type system that is adequate for import/export
from database systems (e.g., relational, object, OLAP);
</li><li>
distinguish requirements relating to lexical data representation
vs. those governing an underlying information set;
</li><li>
allow creation of user-defined datatypes, such as
datatypes that are derived from existing datatypes and which
may constrain certain of its properties (e.g., range,
precision, length, format).
</li></ol></div><div class="div2">
<h3><span class="nav"><a class="nav" href="#requirements"><img src="previous.jpg" alt="previous sub-section"/></a> <a class="nav" href="#terminology"><img src="next.jpg" alt="next sub-section"/></a></span><a id="scope" name="scope"/>1.3 Scope</h3><p>
This portion of the XML Schema Language discusses datatypes that can be
used in an XML Schema.  These datatypes can be specified for element
content that would be specified as
<a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#dt-chardata">#PCDATA</a> and attribute
values of <a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#sec-attribute-types">various
types </a> in a DTD.  It is the intention of this specification
that it be usable outside of the context of XML Schemas for a wide range
of other XML-related activities such as <a href="#XSL">[XSL]</a> and
<a href="#RDFSchema">[RDF Schema]</a>.
</p></div><div class="div2">
<h3><span class="nav"><a class="nav" href="#scope"><img src="previous.jpg" alt="previous sub-section"/></a> <a class="nav" href="#constraints-and-contributions"><img src="next.jpg" alt="next sub-section"/></a></span><a id="terminology" name="terminology"/>1.4 Terminology</h3><p>
The terminology used to describe XML Schema Datatypes is defined in the
body of this specification. The terms defined in the following list are
used in building those definitions and in describing the actions of a
datatype processor:
</p><dl><dt class="label">
<span class="termdef"><a id="dt-compatibility" name="dt-compatibility">[Definition:]&#xa0;&#xa0;</a>
for compatibility</span>
</dt><dd>
A feature of this specification included solely to ensure that schemas
which use this feature remain compatible with <a href="#XML">[XML 1.0 (Second Edition)]</a>
</dd><dt class="label">
<span class="termdef"><a id="dt-may" name="dt-may">[Definition:]&#xa0;&#xa0;</a><b>may</b></span>
</dt><dd>
Conforming documents and processors are permitted to but need
not behave as described.
</dd><dt class="label">
<span class="termdef"><a id="dt-match" name="dt-match">[Definition:]&#xa0;&#xa0;</a><b>match</b></span>
</dt><dd>
(Of strings or names:) Two strings or names being compared must be
identical. Characters with multiple possible representations in ISO/IEC 10646 (e.g.
characters with both precomposed and base+diacritic forms) match only if they have
the same representation in both strings. No case folding is performed. (Of strings and
rules in the grammar:) A string matches a grammatical production if it belongs to the
language generated by that production.
</dd><dt class="label">
 <span class="termdef"><a id="dt-must" name="dt-must">[Definition:]&#xa0;&#xa0;</a><b>must</b></span>
</dt><dd>
Conforming documents and processors are required to behave as
described; otherwise they are in <a class="termref" href="#dt-error"><span class="arrow">&#xb7;</span>error<span class="arrow">&#xb7;</span></a>.
</dd><dt class="label">
<span class="termdef"><a id="dt-error" name="dt-error">[Definition:]&#xa0;&#xa0;</a><b>error</b></span>
</dt><dd>
A violation of the rules of this specification; results are undefined.
Conforming software <a class="termref" href="#dt-may"><span class="arrow">&#xb7;</span>may<span class="arrow">&#xb7;</span></a> detect and report an
<b>error</b> and <a class="termref" href="#dt-may"><span class="arrow">&#xb7;</span>may<span class="arrow">&#xb7;</span></a> recover from it.
</dd></dl></div><div class="div2">
<h3><span class="nav"><a class="nav" href="#terminology"><img src="previous.jpg" alt="previous sub-section"/></a> </span><a id="constraints-and-contributions" name="constraints-and-contributions"/>1.5 Constraints and Contributions</h3><p>
This specification provides three different kinds of normative
statements about schema components, their representations in XML and
their contribution to the schema-validation of information items:
</p><dl><dt class="label">
<span class="termdef"><a id="dt-cos" name="dt-cos">[Definition:]&#xa0;&#xa0;</a>
<b>Constraint on Schemas</b>
</span>
</dt><dd>
Constraints on the schema components themselves, i.e. conditions
components <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> satisfy to be components at all.
Largely to be found in <a href="#datatype-components">Datatype components (&#xa7;4)</a>.
</dd><dt class="label">
<span class="termdef"><a id="dt-src" name="dt-src">[Definition:]&#xa0;&#xa0;</a>
<b>Schema Representation Constraint</b>
</span>
</dt><dd>
Constraints on the representation of schema components in XML.  Some but
not all of these are expressed in <a href="#schema">Schema for Datatype Definitions (normative) (&#xa7;A)</a> and
<a href="#dtd-for-datatypeDefs">DTD for Datatype Definitions (non-normative) (&#xa7;B)</a>.
</dd><dt class="label">
<span class="termdef"><a id="dt-cvc" name="dt-cvc">[Definition:]&#xa0;&#xa0;</a>
<b>Validation Rule</b>
</span>
</dt><dd>
Constraints expressed by schema components which information
items <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> satisfy to be schema-valid.  Largely
to be found in <a href="#datatype-components">Datatype components (&#xa7;4)</a>.
</dd></dl></div></div><div class="div1">
<h2><a id="typesystem" name="typesystem"/>2 Type System</h2><p>
This section describes the conceptual framework behind the type system
defined in this specification.  The framework has been influenced by the
<a href="#ISO11404">[ISO 11404]</a> standard on language-independent datatypes as
well as the datatypes for <a href="#SQL">[SQL]</a> and for programming
languages such as Java.
</p><p>
The datatypes discussed in this specification are computer
representations of well known abstract concepts such as
<em>integer</em> and <em>date</em>. It is not the place of this
specification to define these abstract concepts; many other publications
provide excellent definitions.
</p><div class="div2">
<h3><span class="nav"> <a class="nav" href="#value-space"><img src="next.jpg" alt="next sub-section"/></a></span><a id="datatype" name="datatype"/>2.1 Datatype</h3><p>
<span class="termdef"><a id="dt-datatype" name="dt-datatype">[Definition:]&#xa0;&#xa0;</a>In this specification,
a <b>datatype</b> is a 3-tuple, consisting of
a) a set of distinct values, called its <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>,
b) a set of lexical representations, called its
<a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a>, and c) a set of <a class="termref" href="#dt-facet"><span class="arrow">&#xb7;</span>facet<span class="arrow">&#xb7;</span></a>s
that characterize properties of the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>,
individual values or lexical items.
</span>
</p></div><div class="div2">
<h3><span class="nav"><a class="nav" href="#datatype"><img src="previous.jpg" alt="previous sub-section"/></a> <a class="nav" href="#lexical-space"><img src="next.jpg" alt="next sub-section"/></a></span><a id="value-space" name="value-space"/>2.2 Value space</h3><p>
<span class="termdef"><a id="dt-value-space" name="dt-value-space">[Definition:]&#xa0;&#xa0;</a>A <b>value
space</b> is the set of values for a given datatype.
Each value in the <b>value space</b> of a datatype is denoted by
one or more literals in its <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a>.
</span>
</p><p>
The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of a given datatype can
be defined in one of the following ways:
</p><ul><li>
defined axiomatically from fundamental notions (intensional definition)
[see <a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a>]
</li><li>
enumerated outright (extensional definition)
[see <a class="termref" href="#dt-enumeration"><span class="arrow">&#xb7;</span>enumeration<span class="arrow">&#xb7;</span></a>]
</li><li>
defined by restricting the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of
an already defined datatype to a particular subset with a given set
of properties [see <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>]
</li><li>
defined as a combination of values from one or more already defined
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>(s) by a specific construction procedure
[see <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> and <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a>]
</li></ul><p>
</p><p>
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>s have certain properties.  For example,
they always have the property of <a class="termref" href="#dt-cardinality"><span class="arrow">&#xb7;</span>cardinality<span class="arrow">&#xb7;</span></a>,
some definition of <em>equality</em>
and might be <a class="termref" href="#dt-ordered"><span class="arrow">&#xb7;</span>ordered<span class="arrow">&#xb7;</span></a>, by which individual
values within the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> can be compared to
one another.  The properties of <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>s that
are recognized by this specification are defined in
<a href="#fundamental-facets">Fundamental facets (&#xa7;2.4.1)</a>.
</p></div><div class="div2">
<h3 class="withToc"><span class="nav"><a class="nav" href="#value-space"><img src="previous.jpg" alt="previous sub-section"/></a> <a class="nav" href="#facets"><img src="next.jpg" alt="next sub-section"/></a></span><a id="lexical-space" name="lexical-space"/>2.3 Lexical space</h3><p>
In addition to its <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>, each datatype also
has a lexical space.
</p><p>
<span class="termdef"><a id="dt-lexical-space" name="dt-lexical-space">[Definition:]&#xa0;&#xa0;</a>A
<b>lexical space</b> is the set of valid <em>literals</em>
for a datatype.
</span>
</p><p>
For example, &quot;100&quot; and &quot;1.0E2&quot; are two different literals from the
<a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of <a href="#float">float</a> which both
denote the same value. The type system defined in this specification
provides a mechanism for schema designers to control the set of values
and the corresponding set of acceptable literals of those values for
a datatype.
</p><div class="note"><b>Note:&#xa0;</b>
The literals in the <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a>s defined in this specification
have the following characteristics:
<dl><dt class="label">
Interoperability:
</dt><dd>
The number of literals for each value has been kept small; for many
datatypes there is a one-to-one mapping between literals and values.
This makes it easy to exchange the values between different systems.
In many cases, conversion from locale-dependent representations will
be required on both the originator and the recipient side, both for
computer processing and for interaction with humans.
</dd><dt class="label">
Basic readability:
</dt><dd>
Textual, rather than binary, literals are used.
This makes hand editing, debugging, and similar activities possible.
</dd><dt class="label">
Ease of parsing and serializing:
</dt><dd>
Where possible, literals correspond to those found in common
programming languages and libraries.
</dd></dl></div><div class="div3">
<h4><a id="canonical-lexical-representation" name="canonical-lexical-representation"/>2.3.1 Canonical Lexical Representation</h4><p>
While the datatypes defined in this specification have, for the most part,
a single lexical representation i.e. each value in the datatype's
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> is denoted by a single literal in its
<a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a>, this is not always the case.  The
example in the previous section showed two literals for the datatype
<a href="#float">float</a> which denote the same value.  Similarly, there
<a class="termref" href="#dt-may"><span class="arrow">&#xb7;</span>may<span class="arrow">&#xb7;</span></a> be
several literals for one of the date or time datatypes that denote the
same value using different timezone indicators.
</p><p>
<span class="termdef"><a id="dt-canonical-representation" name="dt-canonical-representation">[Definition:]&#xa0;&#xa0;</a>A <b>canonical lexical representation</b>
is a set of literals from among the valid set of literals
for a datatype such that there is a one-to-one mapping between literals
in the <b>canonical lexical representation</b> and
values in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>.
</span>
</p></div></div><div class="div2">
<h3 class="withToc"><span class="nav"><a class="nav" href="#lexical-space"><img src="previous.jpg" alt="previous sub-section"/></a> <a class="nav" href="#datatype-dichotomies"><img src="next.jpg" alt="next sub-section"/></a></span><a id="facets" name="facets"/>2.4 Facets</h3><div class="localToc">&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;2.4.1 <a href="#fundamental-facets">Fundamental facets</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;2.4.2 <a href="#non-fundamental">Constraining or Non-fundamental facets</a><br/>
</div><p>
<span class="termdef"><a id="dt-facet" name="dt-facet">[Definition:]&#xa0;&#xa0;</a>A <b>facet</b> is a single
defining aspect of a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>.  Generally
speaking, each facet characterizes a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
along independent axes or dimensions.</span>
</p><p>
The facets of a datatype serve to distinguish those aspects of
one datatype which <em>differ</em> from other datatypes.
Rather than being defined solely in terms of a prose description
the datatypes in this specification are defined in terms of
the <em>synthesis</em> of facet values which together determine the
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> and properties of the datatype.
</p><p>
Facets are of two types: <em>fundamental</em> facets that define
the datatype and <em>non-fundamental</em> or <em>constraining
</em> facets that constrain the permitted values of a datatype.
</p><div class="div3">
<h4><a id="fundamental-facets" name="fundamental-facets"/>2.4.1 Fundamental facets</h4><p>
<span class="termdef"><a id="dt-fundamental-facet" name="dt-fundamental-facet">[Definition:]&#xa0;&#xa0;</a>
A <b>fundamental facet</b> is an abstract property which
serves to semantically characterize the values in a
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>.
</span>
</p><p>
All <b>fundamental facets</b> are fully described in
<a href="#rf-fund-facets">Fundamental Facets (&#xa7;4.2)</a>.
</p></div><div class="div3">
<h4><a id="non-fundamental" name="non-fundamental"/>2.4.2 Constraining or Non-fundamental facets</h4><p>
<span class="termdef"><a id="dt-constraining-facet" name="dt-constraining-facet">[Definition:]&#xa0;&#xa0;</a>A
<b>constraining facet</b> is an optional property that can be
applied to a datatype to constrain its <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>.
</span>
</p><p>
Constraining the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> consequently constrains
the <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a>.  Adding
<a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facet<span class="arrow">&#xb7;</span></a>s to a <a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a>
is described in <a href="#derivation-by-restriction">Derivation by restriction (&#xa7;4.1.2.1)</a>.
</p><p>
All <b>constraining facets</b> are fully described in
<a href="#rf-facets">Constraining Facets (&#xa7;4.3)</a>.
</p></div></div><div class="div2">
<h3 class="withToc"><span class="nav"><a class="nav" href="#facets"><img src="previous.jpg" alt="previous sub-section"/></a> </span><a id="datatype-dichotomies" name="datatype-dichotomies"/>2.5 Datatype dichotomies</h3><div class="localToc">&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;2.5.1 <a href="#atomic-vs-list">Atomic vs. list vs. union datatypes</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;2.5.2 <a href="#primitive-vs-derived">Primitive vs. derived datatypes</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;2.5.3 <a href="#built-in-vs-user-derived">Built-in vs. user-derived datatypes</a><br/>
</div><p>
It is useful to categorize the datatypes defined in this specification
along various dimensions, forming a set of characterization dichotomies.
</p><div class="div3">
<h4><a id="atomic-vs-list" name="atomic-vs-list"/>2.5.1 Atomic vs. list vs. union datatypes</h4><p>
The first distinction to be made is that between
<a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a>, <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> and <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a>
datatypes.
</p><ul><li>
<span class="termdef"><a id="dt-atomic" name="dt-atomic">[Definition:]&#xa0;&#xa0;</a><b>Atomic</b> datatypes
are those having values which are regarded by this specification as
being indivisible.
</span>
</li><li>
<span class="termdef"><a id="dt-list" name="dt-list">[Definition:]&#xa0;&#xa0;</a><b>List</b>
datatypes are those having values each of which consists of a
finite-length (possibly empty) sequence of values of an
<a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a> datatype.
</span>
</li><li>
<span class="termdef"><a id="dt-union" name="dt-union">[Definition:]&#xa0;&#xa0;</a><b>Union</b>
datatypes are those whose <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>s and
<a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a>s are the union of
the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>s and
<a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a>s of one or more other datatypes.
</span>
</li></ul><p>
For example, a single token which <a class="termref" href="#dt-match"><span class="arrow">&#xb7;</span>match<span class="arrow">&#xb7;</span></a>es
<a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#NT-Nmtoken">Nmtoken</a> from
<a href="#XML">[XML 1.0 (Second Edition)]</a> could be the value of an <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a>
datatype (<a href="#NMTOKEN">NMTOKEN</a>); while a sequence of such tokens
could be the value of a <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> datatype
(<a href="#NMTOKENS">NMTOKENS</a>).
</p><div class="div4">
<h5><a id="atomic" name="atomic"/>2.5.1.1 Atomic datatypes</h5><p>
<a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a> datatypes can be either
<a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a> or <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>.  The
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of an <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a> datatype
is a set of &quot;atomic&quot; values, which for the purposes of this specification,
are not further decomposable.  The <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of
an <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a> datatype is a set of <em>literals</em>
whose internal structure is specific to the datatype in question.
</p></div><div class="div4">
<h5><a id="list-datatypes" name="list-datatypes"/>2.5.1.2 List datatypes</h5><p>
Several type systems (such as the one described in
<a href="#ISO11404">[ISO 11404]</a>) treat <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> datatypes as
special cases of the more general notions of aggregate or collection
datatypes.
</p><p>
<a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> datatypes are always <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>.
The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of a <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a>
datatype is a set of finite-length sequences of <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a>
values. The <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of a
<a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> datatype is a set of literals whose internal
structure is a space-separated
sequence of literals of the
<a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a> datatype of the items in the
<a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a>.
</p><p>
<span class="termdef"><a id="dt-itemType" name="dt-itemType">[Definition:]&#xa0;&#xa0;</a>
The <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a> or <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a>
datatype that participates in the definition of a <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> datatype
is known as the <b>itemType</b> of that <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> datatype.
</span>
</p><div class="exampleOuter"><div class="exampleHeader">Example</div><div class="exampleInner"><pre>
&lt;simpleType name='sizes'&gt;
  &lt;list itemType='decimal'/&gt;
&lt;/simpleType&gt;
</pre><pre>
&lt;cerealSizes xsi:type='sizes'&gt; 8 10.5 12 &lt;/cerealSizes&gt;
</pre></div></div><p>
A <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> datatype can be <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>
from an <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a> datatype whose
<a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> allows space
(such as <a href="#string">string</a>
or <a href="#anyURI">anyURI</a>)or a
	<a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a> datatype any of whose <a class="propref" href="#defn-memberTypes">{member type definitions}</a>'s
	<a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> allows space.
In such a case, regardless of the input, list items
will be separated at space boundaries.
</p><div class="exampleOuter"><div class="exampleHeader">Example</div><div class="exampleInner"><pre>
&lt;simpleType name='listOfString'&gt;
  &lt;list itemType='string'/&gt;
&lt;/simpleType&gt;
</pre><pre>
&lt;someElement xsi:type='listOfString'&gt;
this is not list item 1
this is not list item 2
this is not list item 3
&lt;/someElement&gt;
</pre></div><div class="exampleWrapper">
In the above example, the value of the <em>someElement</em> element
is not a <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> of <a class="termref" href="#dt-length"><span class="arrow">&#xb7;</span>length<span class="arrow">&#xb7;</span></a> 3;
rather, it is a <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> of <a class="termref" href="#dt-length"><span class="arrow">&#xb7;</span>length<span class="arrow">&#xb7;</span></a>
18.
</div></div><p>
When a datatype is <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from a
<a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> datatype, the following
<a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facet<span class="arrow">&#xb7;</span></a>s apply:
</p><ul><li><a class="termref" href="#dt-length"><span class="arrow">&#xb7;</span>length<span class="arrow">&#xb7;</span></a></li><li><a class="termref" href="#dt-maxLength"><span class="arrow">&#xb7;</span>maxLength<span class="arrow">&#xb7;</span></a></li><li><a class="termref" href="#dt-minLength"><span class="arrow">&#xb7;</span>minLength<span class="arrow">&#xb7;</span></a></li><li><a class="termref" href="#dt-enumeration"><span class="arrow">&#xb7;</span>enumeration<span class="arrow">&#xb7;</span></a></li><li><a class="termref" href="#dt-pattern"><span class="arrow">&#xb7;</span>pattern<span class="arrow">&#xb7;</span></a></li><li><a class="termref" href="#dt-whiteSpace"><span class="arrow">&#xb7;</span>whiteSpace<span class="arrow">&#xb7;</span></a></li></ul><p>
For each of <a class="termref" href="#dt-length"><span class="arrow">&#xb7;</span>length<span class="arrow">&#xb7;</span></a>, <a class="termref" href="#dt-maxLength"><span class="arrow">&#xb7;</span>maxLength<span class="arrow">&#xb7;</span></a>
and <a class="termref" href="#dt-minLength"><span class="arrow">&#xb7;</span>minLength<span class="arrow">&#xb7;</span></a>, the <em>unit of length</em> is
measured in number of list items.  The value of <a class="termref" href="#dt-whiteSpace"><span class="arrow">&#xb7;</span>whiteSpace<span class="arrow">&#xb7;</span></a>
is fixed to the value <em>collapse</em>.
</p><p>

For <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> datatypes the <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a>

is composed of space-separated
literals of its <a class="termref" href="#dt-itemType"><span class="arrow">&#xb7;</span>itemType<span class="arrow">&#xb7;</span></a>.  Hence, any
<a class="termref" href="#dt-pattern"><span class="arrow">&#xb7;</span>pattern<span class="arrow">&#xb7;</span></a> specified when a new datatype is
<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from a <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> datatype is matched against
each literal of the <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> datatype and
not against the literals of the datatype that serves as its
<a class="termref" href="#dt-itemType"><span class="arrow">&#xb7;</span>itemType<span class="arrow">&#xb7;</span></a>.

</p><div class="exampleOuter"><div class="exampleHeader">Example</div><div class="exampleInner"><pre>
&lt;xs:simpleType name='myList'&gt;
	&lt;xs:list itemType='xs:integer'/&gt;
&lt;/xs:simpleType&gt;
&lt;xs:simpleType name='myRestrictedList'&gt;
	&lt;xs:restriction base='myList'&gt;
		&lt;xs:pattern value='123 (\d+\s)*456'/&gt;
	&lt;/xs:restriction&gt;
&lt;/xs:simpleType&gt;
&lt;someElement xsi:type='myRestrictedList'&gt;123 456&lt;/someElement&gt;
&lt;someElement xsi:type='myRestrictedList'&gt;123 987 456&lt;/someElement&gt;
&lt;someElement xsi:type='myRestrictedList'&gt;123 987 567 456&lt;/someElement&gt;

</pre></div></div><p>
The <a href="#canonical-lexical-representation">canonical-lexical-representation</a> for the
<a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> datatype is defined as the lexical form in which
each item in the <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> has the canonical lexical
representation of its  <a class="termref" href="#dt-itemType"><span class="arrow">&#xb7;</span>itemType<span class="arrow">&#xb7;</span></a>.
</p></div><div class="div4">
<h5><a id="union-datatypes" name="union-datatypes"/>2.5.1.3 Union datatypes</h5><p>
The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> and <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a>
of a <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a> datatype are the union of the
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>s and <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a>s of
its <a class="termref" href="#dt-memberTypes"><span class="arrow">&#xb7;</span>memberTypes<span class="arrow">&#xb7;</span></a>.
<a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a> datatypes are always <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>.
Currently, there are no <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>&#xa0;<a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a>
datatypes.
</p><div class="exampleOuter"><div class="exampleHeader">Example</div><div class="exampleWrapper">
A prototypical example of a <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a> type is the
<a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#p-max_occurs">maxOccurs attribute</a> on the
<a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-element">element element</a>
in XML Schema itself: it is a union of nonNegativeInteger
and an enumeration with the single member, the string &quot;unbounded&quot;, as shown below.
</div><div class="exampleInner"><pre>
  &lt;attributeGroup name=&quot;occurs&quot;&gt;
    &lt;attribute name=&quot;minOccurs&quot; type=&quot;nonNegativeInteger&quot;
    	use=&quot;optional&quot; default=&quot;1&quot;/&gt;
    &lt;attribute name=&quot;maxOccurs&quot;use=&quot;optional&quot; default=&quot;1&quot;&gt;
      &lt;simpleType&gt;
        &lt;union&gt;
          &lt;simpleType&gt;
            &lt;restriction base='nonNegativeInteger'/&gt;
          &lt;/simpleType&gt;
          &lt;simpleType&gt;
            &lt;restriction base='string'&gt;
              &lt;enumeration value='unbounded'/&gt;
            &lt;/restriction&gt;
          &lt;/simpleType&gt;
        &lt;/union&gt;
      &lt;/simpleType&gt;
    &lt;/attribute&gt;
  &lt;/attributeGroup&gt;
</pre></div></div><p>
Any number (greater than 1) of <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a> or <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a>
<a class="termref" href="#dt-datatype"><span class="arrow">&#xb7;</span>datatype<span class="arrow">&#xb7;</span></a>s can participate in a <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a> type.
</p><p>
<span class="termdef"><a id="dt-memberTypes" name="dt-memberTypes">[Definition:]&#xa0;&#xa0;</a>
The datatypes that participate in the
definition of a <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a> datatype are known as the
<b>memberTypes</b> of that <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a> datatype.
</span>
</p><p>
The order in which the <a class="termref" href="#dt-memberTypes"><span class="arrow">&#xb7;</span>memberTypes<span class="arrow">&#xb7;</span></a> are specified in the
definition (that is, the order of the &lt;simpleType&gt; children of the &lt;union&gt;
element, or the order of the <a href="#QName">QName</a>s in the <em>memberTypes</em>
attribute) is significant.
During validation, an element or attribute's value is validated against the
<a class="termref" href="#dt-memberTypes"><span class="arrow">&#xb7;</span>memberTypes<span class="arrow">&#xb7;</span></a> in the order in which they appear in the
definition until a match is found.  The evaluation order can be overridden
with the use of <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#xsi_type">xsi:type</a>.
</p><div class="exampleOuter"><div class="exampleHeader">Example</div><div class="exampleWrapper">
For example, given the definition below, the first instance of the &lt;size&gt; element
validates correctly as an <a href="#integer">integer (&#xa7;3.3.13)</a>, the second and third as
<a href="#string">string (&#xa7;3.2.1)</a>.
</div><div class="exampleInner"><pre>
  &lt;xsd:element name='size'&gt;
    &lt;xsd:simpleType&gt;
      &lt;xsd:union&gt;
        &lt;xsd:simpleType&gt;
          &lt;xsd:restriction base='integer'/&gt;
        &lt;/xsd:simpleType&gt;
        &lt;xsd:simpleType&gt;
          &lt;xsd:restriction base='string'/&gt;
        &lt;/xsd:simpleType&gt;
      &lt;/xsd:union&gt;
    &lt;/xsd:simpleType&gt;
  &lt;/xsd:element&gt;
</pre><pre>
  &lt;size&gt;1&lt;/size&gt;
  &lt;size&gt;large&lt;/size&gt;
  &lt;size xsi:type='xsd:string'&gt;1&lt;/size&gt;
</pre></div></div><p> The <a href="#canonical-lexical-representation">canonical-lexical-representation</a> for a
<a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a> datatype is defined as the lexical form in which
the values have the canonical lexical representation
of the appropriate  <a class="termref" href="#dt-memberTypes"><span class="arrow">&#xb7;</span>memberTypes<span class="arrow">&#xb7;</span></a>.</p><div class="note"><b>Note:&#xa0;</b>
A datatype which is <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a> in this specification
need not be an &quot;atomic&quot; datatype in any programming language used to
implement this specification.  Likewise, a datatype which is a
<a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> in this specification need not be a &quot;list&quot;
datatype in any programming language used to implement this specification.
Furthermore, a datatype which is a <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a> in this
specification need not be a &quot;union&quot; datatype in any programming
language used to implement this specification.
</div></div></div><div class="div3">
<h4><a id="primitive-vs-derived" name="primitive-vs-derived"/>2.5.2 Primitive vs. derived datatypes</h4><p>
Next, we distinguish between <a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a> and
<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> datatypes.
</p><ul><li>
<span class="termdef"><a id="dt-primitive" name="dt-primitive">[Definition:]&#xa0;&#xa0;</a><b>Primitive</b>
datatypes are those that are not defined in terms of other datatypes;
they exist <em>ab initio</em>.
</span>
</li><li>
<span class="termdef"><a id="dt-derived" name="dt-derived">[Definition:]&#xa0;&#xa0;</a><b>Derived</b>
datatypes are those that are defined in terms of other datatypes.
</span>
</li></ul><p>
For example, in this specification, <a href="#float">float</a> is a well-defined
mathematical

concept that cannot be defined in terms of other datatypes, while
a <a href="#integer">integer</a> is a special case of the more general datatype
<a href="#decimal">decimal</a>.
</p><p>
<span class="termdef"><a id="dt-anySimpleType" name="dt-anySimpleType">[Definition:]&#xa0;&#xa0;</a>

The simple ur-type definition is a special restriction of the
<a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-urType">ur-type definition</a>
whose name is <b>anySimpleType</b> in the XML Schema namespace.
<b>anySimpleType</b> can be
considered as the <a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a> of all <a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a>
datatypes.
<b>anySimpleType</b> is considered to have an unconstrained lexical space and a
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> consisting of the union of the
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>s of all the
<a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a>
datatypes and the set of all lists of all members of the
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>s of all the
<a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a> datatypes.


</span>
</p><p>
The datatypes defined by this specification fall into both
the <a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a> and <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>
categories.  It is felt that a judiciously chosen set of
<a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a> datatypes will serve the widest
possible audience by providing a set of convenient datatypes that
can be used as is, as well as providing a rich enough base from
which the variety of datatypes needed by schema designers can be
<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>.
</p><p>
In the example above, <a href="#integer">integer</a> is <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>
from <a href="#decimal">decimal</a>.
</p><div class="note"><b>Note:&#xa0;</b>
A datatype which is <a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a> in this specification
need not be a &quot;primitive&quot; datatype in any programming language used to
implement this specification.  Likewise, a datatype which is
<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> in this specification need not be a
&quot;derived&quot; datatype in any programming language used to implement
this specification.
</div><p>
As described in more detail in <a href="#xr-defn">XML Representation of Simple Type Definition Schema Components (&#xa7;4.1.2)</a>,
each <a class="termref" href="#dt-user-derived"><span class="arrow">&#xb7;</span>user-derived<span class="arrow">&#xb7;</span></a> datatype <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a>
be defined in terms of another datatype in one of three ways: 1) by assigning
<a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facet<span class="arrow">&#xb7;</span></a>s which serve to <em>restrict</em> the
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of the <a class="termref" href="#dt-user-derived"><span class="arrow">&#xb7;</span>user-derived<span class="arrow">&#xb7;</span></a>
datatype to a subset of that of the <a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a>; 2) by creating
a <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> datatype whose <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
consists of finite-length sequences of values of its
<a class="termref" href="#dt-itemType"><span class="arrow">&#xb7;</span>itemType<span class="arrow">&#xb7;</span></a>; or 3) by creating a <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a>
datatype whose <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> consists of the union of the
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>s of its <a class="termref" href="#dt-memberTypes"><span class="arrow">&#xb7;</span>memberTypes<span class="arrow">&#xb7;</span></a>.
</p><div class="div4">
<h5><a id="restriction" name="restriction"/>2.5.2.1 Derived by restriction</h5><p>

<span class="termdef"><a id="dt-restriction" name="dt-restriction">[Definition:]&#xa0;&#xa0;</a>A datatype is said to be
<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> by <b>restriction</b> from another datatype
when values for zero or more <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facet<span class="arrow">&#xb7;</span></a>s are specified
that serve to constrain its <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> and/or its
<a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> to a subset of those of its
<a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a>.
</span>
</p><p>
<span class="termdef"><a id="dt-basetype" name="dt-basetype">[Definition:]&#xa0;&#xa0;</a>Every
datatype that is <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> by <b>restriction</b>
is defined in terms of an existing datatype, referred to as its
<b>base type</b>. <b>base type</b>s can be either
<a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a> or <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>.
</span>
</p></div><div class="div4">
<h5><a id="list" name="list"/>2.5.2.2 Derived by list</h5><p>
A <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> datatype can be <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>
from another datatype (its <a class="termref" href="#dt-itemType"><span class="arrow">&#xb7;</span>itemType<span class="arrow">&#xb7;</span></a>) by creating
a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> that consists of a finite-length sequence
of values of its <a class="termref" href="#dt-itemType"><span class="arrow">&#xb7;</span>itemType<span class="arrow">&#xb7;</span></a>.
</p></div><div class="div4">
<h5><a id="union" name="union"/>2.5.2.3 Derived by union</h5><p>
One datatype can be <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from one or more
datatypes by <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a>ing their <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>s
and, consequently, their <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a>s.
</p></div></div><div class="div3">
<h4><a id="built-in-vs-user-derived" name="built-in-vs-user-derived"/>2.5.3 Built-in vs. user-derived datatypes</h4><ul><li>
<span class="termdef"><a id="dt-built-in" name="dt-built-in">[Definition:]&#xa0;&#xa0;</a><b>Built-in</b>
datatypes are those which are defined in this specification,
and can be either <a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a> or
<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>;
</span>
</li><li>
<span class="termdef"><a id="dt-user-derived" name="dt-user-derived">[Definition:]&#xa0;&#xa0;</a>
<b>User-derived</b> datatypes are those <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>
datatypes that are defined by individual schema designers.
</span>
</li></ul><p>
Conceptually there is no difference between the
<a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>&#xa0;<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> datatypes
included in this specification and the <a class="termref" href="#dt-user-derived"><span class="arrow">&#xb7;</span>user-derived<span class="arrow">&#xb7;</span></a>
datatypes which will be created by individual schema designers.
The <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>&#xa0;<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> datatypes
are those which are believed to be so common that if they were not
defined in this specification many schema designers would end up
&quot;reinventing&quot; them.  Furthermore, including these
<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> datatypes in this specification serves to
demonstrate the mechanics and utility of the datatype generation
facilities of this specification.
</p><div class="note"><b>Note:&#xa0;</b>
A datatype which is <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a> in this specification
need not be a &quot;built-in&quot; datatype in any programming language used
to implement this specification.  Likewise, a datatype which is
<a class="termref" href="#dt-user-derived"><span class="arrow">&#xb7;</span>user-derived<span class="arrow">&#xb7;</span></a> in this specification need not
be a &quot;user-derived&quot; datatype in any programming language used to
implement this specification.
</div></div></div></div><div class="div1">
<h2><a id="built-in-datatypes" name="built-in-datatypes"/>3 Built-in datatypes</h2><img border="0" usemap="#typeImage" alt="Diagram of built-in type hierarchy" src="type-hierarchy.gif"/><map id="typeImage" name="typeImage"><area title="anyType" href="http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/#key-urType" coords="283,1,349,21" alt="anyType" shape="rect"/><area title="anySimpleType" href="#dt-anySimpleType" coords="257,62,374,82" alt="anySimpleType" shape="rect"/><area title="duration" href="#duration" coords="51,133,124,154" alt="duration" shape="rect"/><area title="dateTime" href="#dateTime" coords="130,133,202,154" alt="dateTime" shape="rect"/><area title="time" href="#time" coords="207,133,246,154" alt="time" shape="rect"/><area title="date" href="#date" coords="251,133,291,154" alt="date" shape="rect"/><area title="gYearMonth" href="#gYearMonth" coords="296,133,386,154" alt="gYearMonth" shape="rect"/><area title="gYear" href="#gYear" coords="391,133,438,154" alt="gYear" shape="rect"/><area title="gMonthDay" href="#gMonthDay" coords="443,133,523,154" alt="gMonthDay" shape="rect"/><area title="gDay" href="#gDay" coords="528,133,567,154" alt="gDay" shape="rect"/><area title="gMonth" href="#gMonth" coords="572,133,627,154" alt="gMonth" shape="rect"/><area title="boolean" href="#boolean" coords="37,193,103,214" alt="boolean" shape="rect"/><area title="base64Binary" href="#base64Binary" coords="108,193,215,214" alt="base64Binary" shape="rect"/><area title="hexBinary" href="#hexBinary" coords="220,193,301,214" alt="hexBinary" shape="rect"/><area title="float" href="#float" coords="306,193,355,214" alt="float" shape="rect"/><area title="double" href="#double" coords="375,193,431,214" alt="double" shape="rect"/><area title="anyURI" href="#anyURI" coords="437,193,492,214" alt="anyURI" shape="rect"/><area title="QName" href="#QName" coords="498,193,547,214" alt="QName" shape="rect"/><area title="NOTATION" href="#NOTATION" coords="554,193,627,214" alt="NOTATION" shape="rect"/><area title="string" href="#string" coords="2,234,58,254" alt="string" shape="rect"/><area title="decimal" href="#decimal" coords="337,234,393,254" alt="decimal" shape="rect"/><area title="normalizedString" href="#normalizedString" coords="2,274,142,295" alt="normalizedString" shape="rect"/><area title="integer" href="#integer" coords="333,274,397,295" alt="integer" shape="rect"/><area title="token" href="#token" coords="2,336,49,356" alt="token" shape="rect"/><area title="nonPositiveInteger" href="#nonPositiveInteger" coords="182,336,340,356" alt="nonPositiveInteger" shape="rect"/><area title="long" href="#long" coords="345,336,384,356" alt="long" shape="rect"/><area title="nonNegativeInteger" href="#nonNegativeInteger" coords="389,336,546,356" alt="nonNegativeInteger" shape="rect"/><area title="language" href="#language" coords="2,397,74,417" alt="language" shape="rect"/><area title="Name" href="#Name" coords="80,397,119,417" alt="Name" shape="rect"/><area title="NMTOKEN" href="#NMTOKEN" coords="135,397,199,417" alt="NMTOKEN" shape="rect"/><area title="negativeInteger" href="#negativeInteger" coords="212,397,345,417" alt="negativeInteger" shape="rect"/><area title="int" href="#int" coords="350,397,380,417" alt="int" shape="rect"/><area title="unsignedLong" href="#unsignedLong" coords="385,397,492,417" alt="unsignedLong" shape="rect"/><area title="positiveInteger" href="#positiveInteger" coords="497,397,627,417" alt="positiveInteger" shape="rect"/><area title="NCName" href="#NCName" coords="72,437,127,458" alt="NCName" shape="rect"/><area title="NMTOKENS" href="#NMTOKENS" coords="132,437,205,458" alt="NMTOKENS" shape="rect"/><area title="short" href="#short" coords="342,437,389,458" alt="short" shape="rect"/><area title="unsignedInt" href="#unsignedInt" coords="399,437,496,458" alt="unsignedInt" shape="rect"/><area title="ID" href="#ID" coords="18,498,39,518" alt="ID" shape="rect"/><area title="IDREF" href="#IDREF" coords="76,498,123,518" alt="IDREF" shape="rect"/><area title="ENTITY" href="#ENTITY" coords="140,498,196,518" alt="ENTITY" shape="rect"/><area title="byte" href="#byte" coords="345,498,385,518" alt="byte" shape="rect"/><area title="unsignedShort" href="#unsignedShort" coords="390,498,504,518" alt="unsignedShort" shape="rect"/><area title="IDREFS" href="#IDREFS" coords="72,539,127,559" alt="IDREFS" shape="rect"/><area title="ENTITIES" href="#ENTITIES" coords="132,539,204,559" alt="ENTITIES" shape="rect"/><area title="unsignedByte" href="#unsignedByte" coords="394,539,500,559" alt="unsignedByte" shape="rect"/><area title="Built-in Datatypes" alt="Built-in Datatypes" nohref="nohref" shape="default"/></map><p>
      Each built-in datatype in this specification (both
      <a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a> and
      <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>) can be uniquely addressed via a
      URI Reference constructed as follows:
</p><ol class="enumar"><li>the base URI is the URI of the XML Schema namespace</li><li>the fragment identifier is the name of the datatype</li></ol><p>
      For example, to address the <a href="#int">int</a> datatype, the URI is:
</p><ul><li><code>http://www.w3.org/2001/XMLSchema#int</code></li></ul><p>
      Additionally, each facet definition element can be uniquely
      addressed via a URI constructed as follows:
</p><ol class="enumar"><li>the base URI is the URI of the XML Schema namespace</li><li>the fragment identifier is the name of the facet</li></ol><p>
      For example, to address the maxInclusive facet, the URI is:
</p><ul><li><code>http://www.w3.org/2001/XMLSchema#maxInclusive</code></li></ul><p>
      Additionally, each facet usage in a built-in datatype definition
      can be uniquely addressed via a URI constructed as follows:
</p><ol class="enumar"><li>the base URI is the URI of the XML Schema namespace</li><li>the fragment identifier is the name of the datatype, followed
	by a period (&quot;.&quot;) followed by the name of the facet</li></ol><p>
      For example, to address the usage of the maxInclusive facet in
      the definition of int, the URI is:
</p><ul><li><code>http://www.w3.org/2001/XMLSchema#int.maxInclusive</code></li></ul><div class="div2">
<h3><span class="nav"> <a class="nav" href="#built-in-primitive-datatypes"><img src="next.jpg" alt="next sub-section"/></a></span><a id="namespaces" name="namespaces"/>3.1 Namespace considerations</h3><p>
The <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a> datatypes defined by this specification
are designed to be used with the XML Schema definition language as well as other
XML specifications.
To facilitate usage within the XML Schema definition language, the <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>
datatypes in this specification have the namespace name:
</p><ul><li>http://www.w3.org/2001/XMLSchema</li></ul><p>
To facilitate usage in specifications other than the XML Schema definition language,
such as those that do not want to know anything about aspects of the
XML Schema definition language other than the datatypes, each <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>
datatype is also defined in the namespace whose URI is:
</p><ul><li>http://www.w3.org/2001/XMLSchema-datatypes</li></ul><p>
This applies to both
<a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>&#xa0;<a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a> and
<a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>&#xa0;<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> datatypes.
</p><p>
Each <a class="termref" href="#dt-user-derived"><span class="arrow">&#xb7;</span>user-derived<span class="arrow">&#xb7;</span></a> datatype is also associated with a
unique namespace.  However, <a class="termref" href="#dt-user-derived"><span class="arrow">&#xb7;</span>user-derived<span class="arrow">&#xb7;</span></a> datatypes
do not come from the namespace defined by this specification; rather,
they come from the namespace of the schema in which they are defined
(see <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#declare-schema">XML Representation of
Schemas</a> in <a href="#structural-schemas">[XML Schema Part 1: Structures]</a>).
</p></div><div class="div2">
<h3 class="withToc"><span class="nav"><a class="nav" href="#namespaces"><img src="previous.jpg" alt="previous sub-section"/></a> <a class="nav" href="#built-in-derived"><img src="next.jpg" alt="next sub-section"/></a></span><a id="built-in-primitive-datatypes" name="built-in-primitive-datatypes"/>3.2 Primitive datatypes</h3><div class="localToc">&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.2.1 <a href="#string">string</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.2.2 <a href="#boolean">boolean</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.2.3 <a href="#decimal">decimal</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.2.4 <a href="#float">float</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.2.5 <a href="#double">double</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.2.6 <a href="#duration">duration</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.2.7 <a href="#dateTime">dateTime</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.2.8 <a href="#time">time</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.2.9 <a href="#date">date</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.2.10 <a href="#gYearMonth">gYearMonth</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.2.11 <a href="#gYear">gYear</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.2.12 <a href="#gMonthDay">gMonthDay</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.2.13 <a href="#gDay">gDay</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.2.14 <a href="#gMonth">gMonth</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.2.15 <a href="#hexBinary">hexBinary</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.2.16 <a href="#base64Binary">base64Binary</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.2.17 <a href="#anyURI">anyURI</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.2.18 <a href="#QName">QName</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.2.19 <a href="#NOTATION">NOTATION</a><br/>
</div><p>
The <a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a> datatypes defined by this specification
are described below.  For each datatype, the
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> and <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a>
are defined, <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facet<span class="arrow">&#xb7;</span></a>s which apply
to the datatype are listed and any datatypes <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>
from this datatype are specified.
</p><p>
<a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a> datatypes can only be added by revisions
to this specification.
</p><div class="div3">
<h4><a id="string" name="string"/>3.2.1 string</h4><p>
<span class="termdef"><a id="dt-string" name="dt-string">[Definition:]&#xa0;&#xa0;</a>The <b>string</b> datatype
represents character strings in XML.  The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
of <b>string</b> is the set of finite-length sequences of
<a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#dt-character">character</a>s (as defined in
<a href="#XML">[XML 1.0 (Second Edition)]</a>) that <a class="termref" href="#dt-match"><span class="arrow">&#xb7;</span>match<span class="arrow">&#xb7;</span></a> the
<a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#NT-Char">Char</a> production from <a href="#XML">[XML 1.0 (Second Edition)]</a>.
A <a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#dt-character">character</a> is an atomic unit of
communication; it is not further specified except to note that every
<a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#dt-character">character</a> has a corresponding
Universal Character Set code point, which is an integer.
</span>
</p><div class="note"><b>Note:&#xa0;</b>
Many human languages have writing systems that require
child elements for control of aspects such as bidirectional formating or
ruby annotation (see <a href="#ruby">[Ruby]</a> and Section 8.2.4
<a href="http://www.w3.org/TR/1999/REC-html401-19991224/struct/dirlang.html#h-8.2.4">Overriding the
bidirectional algorithm: the BDO element</a> of <a href="#html4">[HTML 4.01]</a>).
Thus, <b>string</b>, as a simple type that can contain only
characters but not child elements, is often not suitable for representing text.
In such situations, a complex type that allows mixed content should be considered.
For more information, see Section 5.5
<a href="http://www.w3.org/TR/2001/REC-xmlschema-0-20010502/#textType">Any Element, Any Attribute</a>
of <a href="#schema-primer">[XML Schema Language: Part 0 Primer]</a>.
</div><div class="note"><b>Note:&#xa0;</b>
As noted in <a href="#dc-ordered">ordered</a>, the fact that this specification does
not specify an <a class="termref" href="#dt-order-relation"><span class="arrow">&#xb7;</span>order-relation<span class="arrow">&#xb7;</span></a> for <a class="termref" href="#dt-string"><span class="arrow">&#xb7;</span>string<span class="arrow">&#xb7;</span></a>
does not preclude other applications from treating strings as being ordered.
</div><div class="div4">
<h5><a id="string-facets" name="string-facets"/>3.2.1.1 Constraining facets</h5><p><strong>string</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-length">length</a></li><li><a href="#rf-minLength">minLength</a></li><li><a href="#rf-maxLength">maxLength</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li></ul></div><div class="div4">
<h5><a id="string-derived-types" name="string-derived-types"/>3.2.1.2 Derived datatypes</h5><p>
			The following <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>
			datatypes are <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
			<strong>string</strong>:
		</p><ul><li><a href="#normalizedString">normalizedString</a></li></ul></div></div><div class="div3">
<h4><a id="boolean" name="boolean"/>3.2.2 boolean</h4><p>
<span class="termdef"><a id="dt-boolean" name="dt-boolean">[Definition:]&#xa0;&#xa0;</a><b>boolean</b> has the
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> required to support the mathematical
concept of binary-valued logic: {true, false}.</span>
</p><div class="div4">
<h5><a id="boolean-lexical-representation" name="boolean-lexical-representation"/>3.2.2.1 Lexical representation</h5><p>
An instance of a datatype that is defined as <a class="termref" href="#dt-boolean"><span class="arrow">&#xb7;</span>boolean<span class="arrow">&#xb7;</span></a>
can have the following legal literals {true, false, 1, 0}.
</p></div><div class="div4">
<h5><a id="boolean-canonical-representation" name="boolean-canonical-representation"/>3.2.2.2 Canonical representation</h5><p>
The canonical representation for <b>boolean</b> is the set of
literals {true, false}.
</p></div><div class="div4">
<h5><a id="boolean-facets" name="boolean-facets"/>3.2.2.3 Constraining facets</h5><p><strong>boolean</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li></ul></div></div><div class="div3">
<h4><a id="decimal" name="decimal"/>3.2.3 decimal</h4><p>
<span class="termdef"><a id="dt-decimal" name="dt-decimal">[Definition:]&#xa0;&#xa0;</a><b>decimal</b>
represents a subset of the real numbers, which can be represented by decimal numerals.
The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <b>decimal</b>
is the set of 
numbers that can be obtained by multiplying an integer by a non-positive
power of ten, i.e., expressible as <em>i &#xd7; 10^-n</em>
where <em>i</em> and <em>n</em> are integers
and <em>n &gt;= 0</em>.
Precision is not reflected in this value space;
the number 2.0 is not distinct from the number 2.00.
The <a class="termref" href="#dt-order-relation"><span class="arrow">&#xb7;</span>order-relation<span class="arrow">&#xb7;</span></a> on <b>decimal</b>
is the order relation on real numbers, restricted
to this subset.
</span>
</p><p>

</p><p>

</p><div class="note"><b>Note:&#xa0;</b>
All <a class="termref" href="#dt-minimally-conforming"><span class="arrow">&#xb7;</span>minimally conforming<span class="arrow">&#xb7;</span></a> processors <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a>
support decimal numbers with a minimum of 18 decimal digits (i.e., with a
<a class="termref" href="#dt-totalDigits"><span class="arrow">&#xb7;</span>totalDigits<span class="arrow">&#xb7;</span></a> of 18).  However,
<a class="termref" href="#dt-minimally-conforming"><span class="arrow">&#xb7;</span>minimally conforming<span class="arrow">&#xb7;</span></a> processors <a class="termref" href="#dt-may"><span class="arrow">&#xb7;</span>may<span class="arrow">&#xb7;</span></a>
set an application-defined limit on the maximum number of decimal digits
they are prepared to support, in which case that application-defined
maximum number <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be clearly documented.
</div><div class="div4">
<h5><a id="decimal-lexical-representation" name="decimal-lexical-representation"/>3.2.3.1 Lexical representation</h5><p>
<b>decimal</b> has a lexical representation
consisting of a finite-length sequence of decimal digits (#x30-#x39) separated
by a period as a decimal indicator.

An optional leading sign is allowed.
If the sign is omitted, &quot;+&quot; is assumed.  Leading and trailing zeroes are optional.
If the fractional part is zero, the period and following zero(es) can
be omitted.
For example: <code>-1.23, 12678967.543233, +100000.00, 210</code>.
</p></div><div class="div4">
<h5><a id="decimal-canonical-representation" name="decimal-canonical-representation"/>3.2.3.2 Canonical representation</h5><p>
The canonical representation for <b>decimal</b> is defined by
prohibiting certain options from the
<a href="#decimal-lexical-representation">Lexical representation (&#xa7;3.2.3.1)</a>.  Specifically, the preceding
optional &quot;+&quot; sign is prohibited.  The decimal point is required. Leading and
trailing zeroes are prohibited subject to the following: there must be at least
one digit to the right and to the left of the decimal point which may be a zero.
</p></div><div class="div4">
<h5><a id="decimal-facets" name="decimal-facets"/>3.2.3.3 Constraining facets</h5><p><strong>decimal</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-totalDigits">totalDigits</a></li><li><a href="#rf-fractionDigits">fractionDigits</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-maxInclusive">maxInclusive</a></li><li><a href="#rf-maxExclusive">maxExclusive</a></li><li><a href="#rf-minInclusive">minInclusive</a></li><li><a href="#rf-minExclusive">minExclusive</a></li></ul></div><div class="div4">
<h5><a id="decimal-derived-types" name="decimal-derived-types"/>3.2.3.4 Derived datatypes</h5><p>
			The following <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>
			datatypes are <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
			<strong>decimal</strong>:
		</p><ul><li><a href="#integer">integer</a></li></ul></div></div><div class="div3">
<h4><a id="float" name="float"/>3.2.4 float</h4><p>
<span class="termdef"><a id="dt-float" name="dt-float">[Definition:]&#xa0;&#xa0;</a><b>float</b>
is patterned after the IEEE single-precision 32-bit floating point type
<a href="#ieee754">[IEEE 754-1985]</a>.  The basic <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of
<b>float</b> consists of the values
<em>m &#xd7; 2^e</em>, where <em>m</em>
is an integer whose absolute value is less than
<em>2^24</em>, and <em>e</em> is an integer
between -149 and 104, inclusive.  In addition to the basic
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> described above, the
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <b>float</b> also contains the
following
three
<em>special values</em>:

positive and negative infinity and not-a-number
(NaN).
The <a class="termref" href="#dt-order-relation"><span class="arrow">&#xb7;</span>order-relation<span class="arrow">&#xb7;</span></a> on <b>float</b>
is: <em>x &lt; y iff y - x</em> is positive
for x and y in the value space.
Positive infinity is greater than all other non-NaN values.
NaN equals itself but is <a class="termref" href="#dt-incomparable"><span class="arrow">&#xb7;</span>incomparable<span class="arrow">&#xb7;</span></a> with (neither greater than nor less than)
any other value in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>.

</span>
</p><div class="note"><b>Note:&#xa0;</b>

&quot;Equality&quot; in this Recommendation is defined to be &quot;identity&quot; (i.e., values that
are identical in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> are equal and vice versa).
Identity must be used for the few operations that are defined in this Recommendation.
Applications using any of the datatypes defined in this Recommendation may use different
definitions of equality for computational purposes; <a href="#ieee754">[IEEE 754-1985]</a>-based computation systems
are examples. Nothing in this Recommendation should be construed as requiring that
such applications use identity as their equality relationship when computing.

<p/>

Any value <a class="termref" href="#dt-incomparable"><span class="arrow">&#xb7;</span>incomparable<span class="arrow">&#xb7;</span></a> with the value used for the four bounding facets
(<a class="termref" href="#dt-minInclusive"><span class="arrow">&#xb7;</span>minInclusive<span class="arrow">&#xb7;</span></a>, <a class="termref" href="#dt-maxInclusive"><span class="arrow">&#xb7;</span>maxInclusive<span class="arrow">&#xb7;</span></a>,
<a class="termref" href="#dt-minExclusive"><span class="arrow">&#xb7;</span>minExclusive<span class="arrow">&#xb7;</span></a>, and <a class="termref" href="#dt-maxExclusive"><span class="arrow">&#xb7;</span>maxExclusive<span class="arrow">&#xb7;</span></a>) will be
excluded from the resulting restricted <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>. In particular,
when &quot;NaN&quot; is used as a facet value for a bounding facet, since no other
<b>float</b> values are <a class="termref" href="#dt-comparable"><span class="arrow">&#xb7;</span>comparable<span class="arrow">&#xb7;</span></a> with it, the result is a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
either having NaN as its only member (the inclusive cases) or that is empty
(the exclusive cases). If any other value is used for a bounding facet,
NaN will be excluded from the resulting restricted <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>;
to add NaN back in requires union with the NaN-only space.

<p/>

This datatype differs from that of <a href="#ieee754">[IEEE 754-1985]</a> in that there is only one
NaN and only one zero. This makes the equality and ordering of values in the data
space differ from that of <a href="#ieee754">[IEEE 754-1985]</a> only in that for schema purposes NaN = NaN.

</div><p>
A literal in the <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> representing a
decimal number <em>d</em> maps to the normalized value
in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <b>float</b> that is
closest to <em>d</em> in the sense defined by
<a href="#clinger1990">[Clinger, WD (1990)]</a>; if <em>d</em> is
exactly halfway between two such values then the even value is chosen.
</p><div class="div4">
<h5><a id="float-lexical-representation" name="float-lexical-representation"/>3.2.4.1 Lexical representation</h5><p>
<b>float</b> values have a lexical representation
consisting of a mantissa followed, optionally, by the character
&quot;E&quot; or &quot;e&quot;, followed by an exponent.  The exponent <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a>
be an <a href="#integer">integer</a>. The mantissa must be a  <a href="#decimal">decimal</a> number. The representations
for exponent and mantissa must follow the lexical rules for
<a href="#integer">integer</a> and <a href="#decimal">decimal</a>.  If the &quot;E&quot; or &quot;e&quot; and
the following exponent are omitted, an exponent value of 0 is assumed.
</p><p>
The <em>special values</em>

positive
and negative infinity and not-a-number have lexical representations

<code>INF</code>, <code>-INF</code> and
<code>NaN</code>, respectively.

Lexical representations for zero may take a positive or negative sign.

</p><p>
For example, <code>-1E4, 1267.43233E12, 12.78e-2, 12</code>
<code>, -0, 0</code>
and <code>INF</code> are all legal literals for <b>float</b>.
</p></div><div class="div4">
<h5><a id="float-canonical-representation" name="float-canonical-representation"/>3.2.4.2 Canonical representation</h5><p>
The canonical representation for <b>float</b> is defined by
prohibiting certain options from the
<a href="#float-lexical-representation">Lexical representation (&#xa7;3.2.4.1)</a>.  Specifically, the exponent
must be indicated by &quot;E&quot;.  Leading zeroes and the preceding optional &quot;+&quot; sign
are prohibited in the exponent.

If the exponent is zero, it must be indicated by &quot;E0&quot;.

For the mantissa, the preceding optional &quot;+&quot; sign is prohibited
and the decimal point is required.

Leading and trailing zeroes are prohibited subject to the following:
number representations must
be normalized such that there is a single digit
which is non-zero
to the left of the decimal point and at least a single digit to the
right of the decimal point

unless the value being represented is zero. The canonical
representation for zero is 0.0E0.
</p></div><div class="div4">
<h5><a id="float-facets" name="float-facets"/>3.2.4.3 Constraining facets</h5><p><strong>float</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-maxInclusive">maxInclusive</a></li><li><a href="#rf-maxExclusive">maxExclusive</a></li><li><a href="#rf-minInclusive">minInclusive</a></li><li><a href="#rf-minExclusive">minExclusive</a></li></ul></div></div><div class="div3">
<h4><a id="double" name="double"/>3.2.5 double</h4><p>
<span class="termdef"><a id="dt-double" name="dt-double">[Definition:]&#xa0;&#xa0;</a>The <b>double</b>
datatype
is patterned after the

IEEE double-precision 64-bit floating point
type <a href="#ieee754">[IEEE 754-1985]</a>.  The basic <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
of <b>double</b> consists of the values
<em>m &#xd7; 2^e</em>, where <em>m</em>
is an integer whose absolute value is less than
<em>2^53</em>, and <em>e</em> is an
integer between -1075 and 970, inclusive.  In addition to the basic
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> described above, the
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <b>double</b> also contains
the following
three
<em>special values</em>:

positive and negative infinity and not-a-number
(NaN).
The <a class="termref" href="#dt-order-relation"><span class="arrow">&#xb7;</span>order-relation<span class="arrow">&#xb7;</span></a> on <b>double</b>
is: <em>x &lt; y iff y - x</em> is positive
for x and y in the value space.
Positive infinity is greater than all other non-NaN values.
NaN equals itself but is <a class="termref" href="#dt-incomparable"><span class="arrow">&#xb7;</span>incomparable<span class="arrow">&#xb7;</span></a> with (neither greater than nor less than)
any other value in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>.

</span>
</p><div class="note"><b>Note:&#xa0;</b>

&quot;Equality&quot; in this Recommendation is defined to be &quot;identity&quot; (i.e., values that
are identical in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> are equal and vice versa).
Identity must be used for the few operations that are defined in this Recommendation.
Applications using any of the datatypes defined in this Recommendation may use different
definitions of equality for computational purposes; <a href="#ieee754">[IEEE 754-1985]</a>-based computation systems
are examples. Nothing in this Recommendation should be construed as requiring that
such applications use identity as their equality relationship when computing.

<p/>

Any value <a class="termref" href="#dt-incomparable"><span class="arrow">&#xb7;</span>incomparable<span class="arrow">&#xb7;</span></a> with the value used for the four bounding facets
(<a class="termref" href="#dt-minInclusive"><span class="arrow">&#xb7;</span>minInclusive<span class="arrow">&#xb7;</span></a>, <a class="termref" href="#dt-maxInclusive"><span class="arrow">&#xb7;</span>maxInclusive<span class="arrow">&#xb7;</span></a>,
<a class="termref" href="#dt-minExclusive"><span class="arrow">&#xb7;</span>minExclusive<span class="arrow">&#xb7;</span></a>, and <a class="termref" href="#dt-maxExclusive"><span class="arrow">&#xb7;</span>maxExclusive<span class="arrow">&#xb7;</span></a>) will be
excluded from the resulting restricted <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>. In particular,
when &quot;NaN&quot; is used as a facet value for a bounding facet, since no other
<b>double</b> values are <a class="termref" href="#dt-comparable"><span class="arrow">&#xb7;</span>comparable<span class="arrow">&#xb7;</span></a> with it, the result is a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
either having NaN as its only member (the inclusive cases) or that is empty
(the exclusive cases). If any other value is used for a bounding facet,
NaN will be excluded from the resulting restricted <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>;
to add NaN back in requires union with the NaN-only space.

<p/>

This datatype differs from that of <a href="#ieee754">[IEEE 754-1985]</a> in that there is only one
NaN and only one zero. This makes the equality and ordering of values in the data
space differ from that of <a href="#ieee754">[IEEE 754-1985]</a> only in that for schema purposes NaN = NaN.

</div><p>
A literal in the <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> representing a
decimal number <em>d</em> maps to the normalized value
in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <b>double</b> that is
closest to <em>d</em>; if <em>d</em> is
exactly halfway between two such values then the even value is chosen.
This is the <em>best approximation</em> of <em>d</em>
(<a href="#clinger1990">[Clinger, WD (1990)]</a>, <a href="#gay1990">[Gay, DM (1990)]</a>), which is more
accurate than the mapping required by <a href="#ieee754">[IEEE 754-1985]</a>.
</p><div class="div4">
<h5><a id="double-lexical-representation" name="double-lexical-representation"/>3.2.5.1 Lexical representation</h5><p>
<b>double</b> values have a lexical representation
consisting of a mantissa followed, optionally, by the character &quot;E&quot; or
&quot;e&quot;, followed by an exponent.  The exponent <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be
an integer.  The mantissa must be a decimal number. The representations
for exponent and mantissa must follow the lexical rules for
<a href="#integer">integer</a> and <a href="#decimal">decimal</a>.  If the &quot;E&quot; or &quot;e&quot;
and the following exponent are omitted, an exponent value of 0 is assumed.
</p><p>
The <em>special values</em>

positive
and negative infinity and not-a-number have lexical representations

<code>INF</code>, <code>-INF</code> and
<code>NaN</code>, respectively.

Lexical representations for zero may take a positive or negative sign.

</p><p>
For example, <code>-1E4, 1267.43233E12, 12.78e-2, 12</code>
<code>, -0, 0</code>
and <code>INF</code>
are all legal literals for <b>double</b>.
</p></div><div class="div4">
<h5><a id="double-canonical-representation" name="double-canonical-representation"/>3.2.5.2 Canonical representation</h5><p>
The canonical representation for <b>double</b> is defined by
prohibiting certain options from the
<a href="#double-lexical-representation">Lexical representation (&#xa7;3.2.5.1)</a>.  Specifically, the exponent
must be indicated by &quot;E&quot;.  Leading zeroes and the preceding optional &quot;+&quot; sign
are prohibited in the exponent.

If the exponent is zero, it must be indicated by &quot;E0&quot;.

For the mantissa, the preceding optional &quot;+&quot; sign is prohibited
and the decimal point is required.

Leading and trailing zeroes are prohibited subject to the following:
number representations must
be normalized such that there is a single digit
which is non-zero
to the left of the decimal point and at least a single digit to the
right of the decimal point

unless the value being represented is zero. The canonical
representation for zero is 0.0E0.
</p></div><div class="div4">
<h5><a id="double-facets" name="double-facets"/>3.2.5.3 Constraining facets</h5><p><strong>double</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-maxInclusive">maxInclusive</a></li><li><a href="#rf-maxExclusive">maxExclusive</a></li><li><a href="#rf-minInclusive">minInclusive</a></li><li><a href="#rf-minExclusive">minExclusive</a></li></ul></div></div><div class="div3">
<h4><a id="duration" name="duration"/>3.2.6 duration</h4><p>
<span class="termdef"><a id="dt-duration" name="dt-duration">[Definition:]&#xa0;&#xa0;</a>
<b>duration</b> represents a duration of time.
The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <b>duration</b> is
a six-dimensional space where the coordinates
designate the Gregorian year, month, day, hour, minute, and second components defined in
&#xa7; 5.5.3.2 of <a href="#ISO8601">[ISO 8601]</a>,
respectively.  These components are ordered
in their significance by their order of appearance i.e. as year, month, day,
hour, minute, and second.
</span></p><div class="note"><a id="year-sec-conformance" name="year-sec-conformance"/><p class="prefix"><b>Note:</b></p>
All <a class="termref" href="#dt-minimally-conforming"><span class="arrow">&#xb7;</span>minimally conforming<span class="arrow">&#xb7;</span></a> processors <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a>
support year values with a minimum of 4 digits (i.e., <code>YYYY</code>) and a minimum fractional second precision of milliseconds or three decimal digits (i.e. <code>s.sss</code>).  However,
<a class="termref" href="#dt-minimally-conforming"><span class="arrow">&#xb7;</span>minimally conforming<span class="arrow">&#xb7;</span></a> processors <a class="termref" href="#dt-may"><span class="arrow">&#xb7;</span>may<span class="arrow">&#xb7;</span></a>
set an application-defined limit on the maximum number of digits
they are prepared to support in these two cases, in which case that application-defined
maximum number <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be clearly documented.
</div><div class="div4">
<h5><a id="duration-lexical-repr" name="duration-lexical-repr"/>3.2.6.1 Lexical representation</h5><p>
The lexical representation for <b>duration</b> is the
<a href="#ISO8601">[ISO 8601]</a> extended format P<em>n</em>Y<em>n</em>
M<em>n</em>DT<em>n</em>H <em>n</em>M<em>n</em>S, where
<em>n</em>Y represents the number of years, <em>n</em>M the
number of months, <em>n</em>D the number of days, 'T' is the
date/time separator, <em>n</em>H the number of hours,
<em>n</em>M the number of minutes and <em>n</em>S the
number of seconds.  The number of seconds can include decimal digits
to arbitrary precision.</p><p>
The values of the
Year, Month, Day, Hour and Minutes components are not restricted but
allow an arbitrary
unsigned integer, i.e., an integer that
conforms to the pattern <code>[0-9]+</code>..
Similarly, the value of the Seconds component
allows an arbitrary unsigned decimal.
Following <a href="#ISO8601">[ISO 8601]</a>, at least one digit must
follow the decimal point if it appears.  That is, the value of the Seconds component
must conform to the pattern <code>[0-9]+(\.[0-9]+)?</code>.
Thus, the lexical representation of
<b>duration</b> does not follow the alternative
format of &#xa7; 5.5.3.2.1 of <a href="#ISO8601">[ISO 8601]</a>.</p><p>
An optional preceding minus sign ('-') is
allowed, to indicate a negative duration.  If the sign is omitted a
positive duration is indicated. See also <a href="#isoformats">ISO 8601 Date and Time Formats (&#xa7;D)</a>.
</p><p>
For example, to indicate a duration of 1 year, 2 months, 3 days, 10
hours, and 30 minutes, one would write: <code>P1Y2M3DT10H30M</code>.
One could also indicate a duration of minus 120 days as:
<code>-P120D</code>.
</p><p>
Reduced precision and truncated representations of this format are allowed
provided they conform to the following:
</p><ul><li>
If the number of years, months, days, hours, minutes, or seconds in any
expression equals zero, the number and its corresponding designator <a class="termref" href="#dt-may"><span class="arrow">&#xb7;</span>may<span class="arrow">&#xb7;</span></a>
be omitted.  However, at least one number and its designator <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a>
be present.
</li><li>
The seconds part <a class="termref" href="#dt-may"><span class="arrow">&#xb7;</span>may<span class="arrow">&#xb7;</span></a> have a decimal fraction.
</li><li>
The designator 'T' must
be absent if and only if all of the time items are absent.
The designator 'P' must always be present.
</li></ul><p>
For example, P1347Y, P1347M and P1Y2MT2H are all allowed;
P0Y1347M and P0Y1347M0D are allowed. P-1347M is not allowed although
-P1347M is allowed.  P1Y2MT is not allowed.
</p></div><div class="div4">
<h5><a id="duration-order" name="duration-order"/>3.2.6.2 Order relation on duration</h5><p>
In general, the <a class="termref" href="#dt-order-relation"><span class="arrow">&#xb7;</span>order-relation<span class="arrow">&#xb7;</span></a> on <b>duration</b>
is a partial order since there is no determinate relationship between certain
durations such as one month (P1M) and 30 days (P30D).
The <a class="termref" href="#dt-order-relation"><span class="arrow">&#xb7;</span>order-relation<span class="arrow">&#xb7;</span></a>
of two <b>duration</b> values <em>x</em> and
<em>y</em> is <em>x &lt; y iff s+x &lt; s+y</em>
for each qualified <a href="#dateTime">dateTime</a> <em> s</em>
in the list below.  These values for <em>s</em> cause the greatest deviations in the addition of
dateTimes and durations.  Addition of durations to time instants is defined
in <a href="#adding-durations-to-dateTimes">Adding durations to dateTimes (&#xa7;E)</a>.
</p><ul><li>1696-09-01T00:00:00Z</li><li>1697-02-01T00:00:00Z</li><li>1903-03-01T00:00:00Z</li><li>1903-07-01T00:00:00Z</li></ul><p>
</p><p>
The following table shows the strongest relationship that can be determined
between example durations. The symbol &lt;&gt; means that the order relation is
indeterminate.  Note that because of leap-seconds, a seconds field can vary
from 59 to 60. However, because of the way that addition is defined in
<a href="#adding-durations-to-dateTimes">Adding durations to dateTimes (&#xa7;E)</a>, they are still totally ordered.
</p><table cellpadding="4" cellspacing="0" border="1"><tbody><tr><th>&#xa0;</th><th style="background-color:#FFFF99" colspan="7">Relation</th></tr><tr><td style="background-color:#FFFF99">P<b>1Y</b></td><td>&gt; P<b>364D</b></td><td>&lt;&gt; P<b>365D</b></td><td colspan="3">&#xa0;</td><td>&lt;&gt; P<b>366D</b></td><td>&lt; P<b>367D</b></td></tr><tr><td style="background-color:#FFFF99">P<b>1M</b></td><td>&gt; P<b>27D</b></td><td>&lt;&gt; P<b>28D</b></td><td colspan="2">&lt;&gt; P<b>29D</b></td><td>&lt;&gt; P<b>30D</b></td><td>&lt;&gt; P<b>31D</b></td><td>&lt; P<b>32D</b></td></tr><tr><td style="background-color:#FFFF99">P<b>5M</b></td><td>&gt; P<b>149D</b></td><td>&lt;&gt; P<b>150D</b></td><td>&lt;&gt; P<b>151D</b></td><td colspan="2">&lt;&gt; P<b>152D</b></td><td>&lt;&gt; P<b>153D</b></td><td>&lt; P<b>154D</b></td></tr></tbody></table><p>
Implementations are free to optimize the computation of the ordering relationship. For example, the following table can be used to
compare durations of a small number of months against days.
</p><table cellpadding="2" cellspacing="0" border="1"><tbody><tr><th align="center">&#xa0;</th><th style="background-color: #FFFF99" align="center">Months</th><th style="background-color: #FFFF99" align="center">1</th><th style="background-color: #FFFF99" align="center">2</th><th style="background-color: #FFFF99" align="center">3</th><th style="background-color: #FFFF99" align="center">4</th><th style="background-color: #FFFF99" align="center">5</th><th style="background-color: #FFFF99" align="center">6</th><th style="background-color: #FFFF99" align="center">7</th><th style="background-color: #FFFF99" align="center">8</th><th style="background-color: #FFFF99" align="center">9</th><th style="background-color: #FFFF99" align="center">10</th><th style="background-color: #FFFF99" align="center">11</th><th style="background-color: #FFFF99" align="center">12</th><th style="background-color: #FFFF99" align="center">13</th><th style="background-color: #FFFF99" align="center">...</th></tr><tr><th style="background-color: #FFFF99" rowspan="2" align="center">Days</th><th style="background-color: #FFFF99" align="center">Minimum</th><td align="center">28</td><td align="center">59</td><td align="center">89</td><td align="center">120</td><td align="center">150</td><td align="center">181</td><td align="center">212</td><td align="center">242</td><td align="center">273</td><td align="center">303</td><td align="center">334</td><td align="center">365</td><td align="center">393</td><td align="center">...</td></tr><tr><th style="background-color: #FFFF99" align="center">Maximum</th><td align="center">31</td><td align="center">62</td><td align="center">92</td><td align="center">123</td><td align="center">153</td><td align="center">184</td><td align="center">215</td><td align="center">245</td><td align="center">276</td><td align="center">306</td><td align="center">337</td><td align="center">366</td><td align="center">397</td><td align="center">...</td></tr></tbody></table></div><div class="div4">
<h5><a id="facet-comparison-for-durations" name="facet-comparison-for-durations"/>3.2.6.3 Facet Comparison for durations</h5><p>In comparing <b>duration</b>
values with <a href="#dc-minInclusive">minInclusive</a>,  <a href="#dc-minExclusive">minExclusive</a>,
<a href="#dc-maxInclusive">maxInclusive</a> and <a href="#dc-maxExclusive">maxExclusive</a> facet values
indeterminate comparisons should be considered as &quot;false&quot;.
</p></div><div class="div4">
<h5><a id="total-order-durations" name="total-order-durations"/>3.2.6.4 Totally ordered durations</h5><p>
Certain derived datatypes of durations can be guaranteed have a total order. For
this, they must have fields from only one row in the list below and the time zone
must either be required or prohibited.
</p><ul><li>year, month</li><li>day, hour, minute, second</li></ul><p>
For example, a datatype could be defined to correspond to the
<a href="#SQL">[SQL]</a> datatype Year-Month interval that required a four digit
year field and a two digit month field but required all other fields to be unspecified.  This datatype could be defined as below and would have a total order.
</p><pre>&lt;simpleType name='SQL-Year-Month-Interval'&gt;
    &lt;restriction base='duration'&gt;
      &lt;pattern value='P\p{Nd}{4}Y\p{Nd}{2}M'/&gt;
    &lt;/restriction&gt;
&lt;/simpleType&gt;</pre></div><div class="div4">
<h5><a id="duration-facets" name="duration-facets"/>3.2.6.5 Constraining facets</h5><p><strong>duration</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-maxInclusive">maxInclusive</a></li><li><a href="#rf-maxExclusive">maxExclusive</a></li><li><a href="#rf-minInclusive">minInclusive</a></li><li><a href="#rf-minExclusive">minExclusive</a></li></ul></div></div><div class="div3">
<h4><a id="dateTime" name="dateTime"/>3.2.7 dateTime</h4><p>
<span class="termdef"><a id="dt-dateTime" name="dt-dateTime">[Definition:]&#xa0;&#xa0;</a>
<b>dateTime</b> values may be viewed as objects with integer-valued
year, month, day, hour and minute properties, a decimal-valued second property,
and a boolean timezoned property.
Each such object also has one decimal-valued
method or computed property, timeOnTimeline, whose value is always a decimal
number; the values are dimensioned in seconds, the integer 0 is
0001-01-01T00:00:00 and the value of timeOnTimeline for other <b>dateTime</b>
values is computed using the Gregorian algorithm as modified for leap-seconds.
The timeOnTimeline values form two related &quot;timelines&quot;, one for timezoned
values and one for non-timezoned values.
Each timeline is a copy of the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <a href="#decimal">decimal</a>,
with integers given units of seconds.
</span>
</p><p>
The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of
<b>dateTime</b> is closely related to the dates and times described in ISO 8601.
For clarity, the text above specifies a particular origin point for the
timeline.
It should be noted, however, that schema processors need not expose the
timeOnTimeline value to schema users, and there is no requirement that a
timeline-based implementation use the particular origin described here in
its internal representation.
Other interpretations of the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> which lead to the
same results (i.e., are isomorphic) are of course acceptable.
</p><p>
All timezoned times are Coordinated Universal Time (UTC, sometimes called
&quot;Greenwich Mean Time&quot;). Other timezones indicated in lexical representations
are converted to UTC during conversion of literals to values.
&quot;Local&quot; or untimezoned times are presumed to be the time in the timezone of some
unspecified locality as prescribed by the appropriate legal authority;
currently there are no legally prescribed timezones which are durations
whose magnitude is greater than 14 hours. The value of each numeric-valued property
(other than timeOnTimeline) is limited to the maximum value within the interval
determined by the next-higher property. For example, the day value can never be 32,
and cannot even be 29 for month 02 and year 2002 (February 2002).
</p><div class="note"><a id="year-zero" name="year-zero"/><p class="prefix"><b>Note:</b></p>The date and time datatypes described in this recommendation were inspired
by <a href="#ISO8601">[ISO 8601]</a>.  '0001' is the lexical representation of the year 1 of the Common Era
(1
CE, sometimes written &quot;AD 1&quot; or &quot;1 AD&quot;).  There is no year 0, and '0000' is not a valid lexical representation. '-0001' is the lexical representation of the year 1 Before
Common Era (1 BCE, sometimes written &quot;1 BC&quot;).<p/>Those using this (1.0) version of this Recommendation to
represent negative years should be aware that the interpretation of lexical
representations beginning with a <code>'-'</code> is likely to change in
subsequent versions.<p/>
 <a href="#ISO8601">[ISO 8601]</a>
makes no mention of the year 0; in <a href="#ISO8601-1998">[ISO 8601:1998 Draft Revision]</a>
the form '0000' was disallowed and this recommendation disallows it as well.
However, <a href="#ISO8601-2000">[ISO 8601:2000 Second Edition]</a>, which became available just as we were completing version
1.0, allows the form '0000', representing the year 1 BCE.  A number of external commentators
have also suggested that '0000' be
allowed, as the lexical representation for 1 BCE, which is the normal usage in
astronomical contexts.  
 It is the intention of the XML Schema
        Working Group to allow '0000' as a lexical representation in the
        <b>dateTime</b>, <b>date</b>, <b>gYear</b>, and
<b>gYearMonth</b> datatypes in a subsequent version
        of this Recommendation. '0000' will be the lexical representation of 1
BCE (which is a leap year), '-0001' will become the lexical representation of 2
BCE (not 1 BCE as in this (1.0) version), '-0002' of 3 BCE, etc.
</div><div class="note"><b>Note:&#xa0;</b>See the conformance note in <a href="#year-sec-conformance"> (&#xa7;3.2.6)</a> which
applies to this datatype as well.</div><div class="div4">
<h5><a id="dateTime-lexical-representation" name="dateTime-lexical-representation"/>3.2.7.1 Lexical representation</h5><p>
The <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of <b>dateTime</b> consists of
finite-length sequences of characters of the form:
<code>'-'? yyyy '-' mm '-' dd 'T' hh ':' mm ':' ss ('.' s+)? (zzzzzz)?</code>,
where 









</p><ul><li>'-'? <em>yyyy</em> is a four-or-more digit optionally negative-signed
numeral that represents the year; if more than four digits, leading zeros
are prohibited, and '0000' is prohibited (see the Note above <a href="#year-zero"> (&#xa7;3.2.7)</a>; also note that a plus sign is <b>not</b> permitted);</li><li>the remaining '-'s are separators between parts of the date portion;</li><li>the first <em>mm</em> is a two-digit numeral that represents the month;</li><li><em>dd</em> is a two-digit numeral that represents the day;</li><li>'T' is a separator indicating that time-of-day follows;</li><li><em>hh</em> is a two-digit numeral that represents the hour; '24' is permitted if the
minutes and seconds represented are zero, and the <b>dateTime</b> value so
represented is the first instant of the following day (the hour property of a
<b>dateTime</b> object in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> cannot have
a value greater than 23);</li><li>':' is a separator between parts of the time-of-day portion;</li><li>the second <em>mm</em> is a two-digit numeral that represents the minute;</li><li><em>ss</em> is a two-integer-digit numeral that represents the
whole seconds;</li><li>'.' <em>s+</em> (if present) represents the
fractional seconds;</li><li><em>zzzzzz</em> (if present) represents the timezone (as described below).</li></ul><p>
For example, 2002-10-10T12:00:00-05:00 (noon on 10 October 2002, Central Daylight
Savings Time as well as Eastern Standard Time in the U.S.) is 2002-10-10T17:00:00Z,
five hours later than 2002-10-10T12:00:00Z.
</p><p>
For further guidance on arithmetic with <b>dateTime</b>s and durations,
see <a href="#adding-durations-to-dateTimes">Adding durations to dateTimes (&#xa7;E)</a>.
</p></div><div class="div4">
<h5><a id="dateTime-canonical-representation" name="dateTime-canonical-representation"/>3.2.7.2 Canonical representation</h5><p>
Except for trailing fractional zero digits in the seconds representation,
'24:00:00' time representations, and timezone (for timezoned values), the mapping
from literals to values is one-to-one. Where there is more than
one possible representation, the canonical representation is as follows:

 </p><ul><li>The 2-digit numeral representing the hour must not be '<code>24</code>';</li><li>The fractional second string, if present, must not end in '<code>0</code>';</li><li>for timezoned values, the timezone must be
represented with '<code>Z</code>'
(All timezoned <b>dateTime</b> values are UTC.).</li></ul><p>
</p></div><div class="div4">
<h5><a id="dateTime-timezones" name="dateTime-timezones"/>3.2.7.3 Timezones</h5><p>
Timezones are durations with (integer-valued) hour and minute properties
(with the hour magnitude limited to at most 14, and the minute magnitude
limited to at most 59, except that if the hour magnitude is 14, the minute
value must be 0); they may be both positive or both negative.
</p><p>
The lexical representation of a timezone is a string of the form:
<code>(('+' | '-') hh ':' mm) | 'Z'</code>,
where</p><ul><li><em>hh</em> is a two-digit numeral (with leading zeros as required) that
represents the hours,</li><li><em>mm</em> is a two-digit numeral that represents the minutes,</li><li>'+' indicates a nonnegative duration,</li><li>'-' indicates a nonpositive duration.</li></ul><p>The mapping so defined is one-to-one, except that '+00:00', '-00:00', and 'Z'
all represent the same zero-length duration timezone, UTC; 'Z' is its canonical
representation.</p><p>
When a timezone is added to a UTC <b>dateTime</b>, the result is the date
and time &quot;in that timezone&quot;.  For example, 2002-10-10T12:00:00+05:00 is
2002-10-10T07:00:00Z and 2002-10-10T00:00:00+05:00 is 2002-10-09T19:00:00Z.
</p></div><div class="div4">
<h5><a id="dateTime-order" name="dateTime-order"/>3.2.7.4 Order relation on dateTime</h5><p>
<b>dateTime</b> value objects on either timeline are totally ordered by their timeOnTimeline
values; between the two timelines, <b>dateTime</b> value objects are ordered by their
timeOnTimeline values when their timeOnTimeline values differ by more than
fourteen hours, with those whose difference is a duration of 14 hours or less
being <a class="termref" href="#dt-incomparable"><span class="arrow">&#xb7;</span>incomparable<span class="arrow">&#xb7;</span></a>.
</p><p>
In general, the <a class="termref" href="#dt-order-relation"><span class="arrow">&#xb7;</span>order-relation<span class="arrow">&#xb7;</span></a> on <b>dateTime</b>
is a partial order since there is no determinate relationship between certain
instants. For example, there is no determinate
ordering between
(a)
2000-01-20T12:00:00 and (b) 2000-01-20T12:00:00<b>Z</b>. Based on
timezones currently in use, (c) could vary from 2000-01-20T12:00:00+12:00 to
2000-01-20T12:00:00-13:00. It is, however, possible for this range to expand or
contract in the future, based on local laws. Because of this, the following
definition uses a somewhat broader range of indeterminate values: +14:00..-14:00.</p><p>The following definition uses the notation S[year] to represent the year
field of S, S[month] to represent the month field, and so on. The notation (Q
&amp; &quot;-14:00&quot;) means adding the timezone -14:00 to Q, where Q did not
already have a timezone. <em>This is a logical explanation of the process. Actual
implementations are free to optimize as long as they produce the same results.</em>
</p><p>
The ordering between two <b>dateTime</b>s P and Q is defined by the following
algorithm:
</p><p>A.Normalize P and Q. That is, if there is a timezone present, but
  it is not Z, convert it to Z using the addition operation defined in
  <a href="#adding-durations-to-dateTimes">Adding durations to dateTimes (&#xa7;E)</a></p><ul><li>Thus 2000-03-04T23:00:00+03:00 normalizes to 2000-03-04T20:00:00Z</li></ul><p>B. If P and Q either both have a time zone or both do not have a time
   zone, compare P and Q field by field from the year field down to the
   second field, and return a result as soon as it can be determined. That is:</p><ol class="enumar"><li>For each i in {year, month, day, hour, minute, second}
      <ol class="enumla"><li>If P[i] and Q[i] are both not specified, continue to the next i</li><li>If P[i] is not specified and Q[i] is, or vice versa, stop and return
          P &lt;&gt; Q</li><li>If P[i] &lt; Q[i], stop and return P &lt; Q</li><li>If P[i] &gt; Q[i], stop and return P &gt; Q</li></ol>
	</li><li>Stop and return P = Q</li></ol><p>C.Otherwise, if P contains a time zone and Q does not, compare
  as follows:
 </p><ol class="enumar"><li>P &lt; Q if P &lt; (Q with time zone +14:00)</li><li>P &gt; Q if P &gt; (Q with time zone -14:00)</li><li>P &lt;&gt; Q otherwise, that is, if (Q with time zone +14:00) &lt; P &lt; (Q with time zone -14:00)</li></ol><p>D. Otherwise, if P does not contain a time zone and Q does, compare
  as follows:</p><ol class="enumar"><li> P &lt; Q if (P with time zone -14:00) &lt; Q.</li><li> P &gt; Q if (P with time zone +14:00) &gt; Q.</li><li> P &lt;&gt; Q otherwise, that is, if (P with time zone +14:00) &lt; Q &lt; (P with time zone -14:00)</li></ol><p>Examples:</p><table cellpadding="4" cellspacing="0" border="1"><tbody><tr><th style="background-color: #FFFF99" align="center">Determinate</th><th style="background-color: #FFFF99" align="center">Indeterminate</th></tr><tr><td align="center">2000-01-15T00:00:00 <b>&lt;</b> 2000-02-15T00:00:00</td><td align="center">2000-01-01T12:00:00 <b>&lt;&gt;</b>
          1999-12-31T23:00:00Z</td></tr><tr><td align="center">2000-01-15T12:00:00 <b>&lt;</b> 2000-01-16T12:00:00Z</td><td align="center">2000-01-16T12:00:00 <b>&lt;&gt;</b>
          2000-01-16T12:00:00Z</td></tr><tr><td align="center">&#xa0;</td><td align="center">2000-01-16T00:00:00 <b>&lt;&gt;</b> 2000-01-16T12:00:00Z</td></tr></tbody></table></div><div class="div4">
<h5><a id="totally-ordered-instants" name="totally-ordered-instants"/>3.2.7.5 Totally ordered dateTimes</h5><p>Certain derived types from <b>dateTime</b>
can be guaranteed have a total order. To
do so, they must require that a specific set of fields are always specified, and
that remaining fields (if any) are always unspecified. For example, the date
datatype without time zone is defined to contain exactly year, month, and day.
Thus dates without time zone have a total order among themselves.</p></div><div class="div4">
<h5><a id="dateTime-facets" name="dateTime-facets"/>3.2.7.6 Constraining facets</h5><p><strong>dateTime</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-maxInclusive">maxInclusive</a></li><li><a href="#rf-maxExclusive">maxExclusive</a></li><li><a href="#rf-minInclusive">minInclusive</a></li><li><a href="#rf-minExclusive">minExclusive</a></li></ul></div></div><div class="div3">
<h4><a id="time" name="time"/>3.2.8 time</h4><p>
<span class="termdef"><a id="dt-time" name="dt-time">[Definition:]&#xa0;&#xa0;</a><b>time</b>
represents an instant of time that recurs every day.  The
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <b>time</b> is the space
of <em>time of day</em> values as defined in &#xa7; 5.3 of
<a href="#ISO8601">[ISO 8601]</a>.  Specifically, it is a set of zero-duration daily
time instances.</span>
</p><p>
Since the lexical representation allows an optional time zone
indicator, <b>time</b> values are partially ordered because it may
not be able to determine the order of two values one of which has a
time zone and the other does not.  The order relation on
<b>time</b> values is the
<a href="#dateTime-order">Order relation on dateTime (&#xa7;3.2.7.4)</a> using an arbitrary date. See also
<a href="#adding-durations-to-dateTimes">Adding durations to dateTimes (&#xa7;E)</a>.  Pairs of <b>time</b> values with or without time zone indicators are totally ordered.
</p><div class="note"><b>Note:&#xa0;</b>See the conformance note in <a href="#year-sec-conformance"> (&#xa7;3.2.6)</a> which
applies to the seconds part of this datatype as well.</div><div class="div4">
<h5><a id="time-lexical-repr" name="time-lexical-repr"/>3.2.8.1 Lexical representation</h5><p>
The lexical representation for <b>time</b> is the left
truncated lexical representation for <a href="#dateTime">dateTime</a>:
hh:mm:ss.sss with optional following time zone indicator.  For example,
to indicate 1:20 pm for Eastern Standard Time which is 5 hours behind
Coordinated Universal Time (UTC), one would write: 13:20:00-05:00. See also
<a href="#isoformats">ISO 8601 Date and Time Formats (&#xa7;D)</a>.
</p></div><div class="div4">
<h5><a id="time-canonical-repr" name="time-canonical-repr"/>3.2.8.2 Canonical representation</h5><p>
The canonical representation for <b>time</b> is defined
by prohibiting certain options from the
<a href="#time-lexical-repr">Lexical representation (&#xa7;3.2.8.1)</a>.  Specifically, either the time zone must
be omitted or, if present,  the time zone must be Coordinated Universal
Time (UTC) indicated by a &quot;Z&quot;.
Additionally, the canonical representation for midnight is 00:00:00.
</p></div><div class="div4">
<h5><a id="time-facets" name="time-facets"/>3.2.8.3 Constraining facets</h5><p><strong>time</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-maxInclusive">maxInclusive</a></li><li><a href="#rf-maxExclusive">maxExclusive</a></li><li><a href="#rf-minInclusive">minInclusive</a></li><li><a href="#rf-minExclusive">minExclusive</a></li></ul></div></div><div class="div3">
<h4><a id="date" name="date"/>3.2.9 date</h4><p>
<span class="termdef"><a id="dt-date" name="dt-date">[Definition:]&#xa0;&#xa0;</a>
The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <b>date</b>
consists of top-open intervals of exactly one day in length on the timelines of
<a href="#dateTime">dateTime</a>, beginning on the beginning moment of each day (in
each timezone), i.e. '00:00:00', up to but not including '24:00:00' (which is
identical with '00:00:00' of the next day).  For nontimezoned values, the top-open
intervals disjointly cover the nontimezoned timeline, one per day.  For timezoned
values, the intervals begin at every minute and therefore overlap.
</span>
</p><p>
A &quot;date object&quot; is an object with year, month, and day properties just like those
of <a href="#dateTime">dateTime</a> objects, plus an optional <em>timezone-valued</em>
timezone property. (As with values of <a href="#dateTime">dateTime</a> timezones are a
special case of durations.)
Just as a <a href="#dateTime">dateTime</a> object corresponds to a point on one of the
timelines, a <b>date</b> object corresponds to an interval on one
of the two timelines as just described.
</p><p>
Timezoned <b>date</b> values track the starting moment of their day, as
determined by their timezone; said timezone is generally recoverable for
canonical representations.
<span class="termdef"><a id="recoverable-timezone" name="recoverable-timezone">[Definition:]&#xa0;&#xa0;</a>
The <b>recoverable timezone</b> is that duration which
is the result of subtracting the first moment (or any moment) of the timezoned
<b>date</b> from the first moment (or the corresponding moment) UTC on the
same <b>date</b>.</span>  <a class="termref" href="#recoverable-timezone"><span class="arrow">&#xb7;</span>recoverable timezone<span class="arrow">&#xb7;</span></a>s are
always durations between '+12:00' and '-11:59'.  This &quot;timezone normalization&quot;
(which follows automatically from the definition of the <b>date</b>
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>) is explained more in
<a href="#date-lexical-representation">Lexical representation (&#xa7;3.2.9.1)</a>.
</p><p>
For example: the first moment of 2002-10-10+13:00 is 2002-10-10T00:00:00+13,
which is 2002-10-09T11:00:00Z, which is also the first moment of 2002-10-09-11:00.
Therefore 2002-10-10+13:00 is 2002-10-09-11:00; <em>they are the same interval</em>.
</p><div class="note"><b>Note:&#xa0;</b>
For most timezones, either the first moment or last moment of the day (a
<a href="#dateTime">dateTime</a> value, always UTC) will have a <b>date</b> portion
different from that of the <b>date</b> itself!
However, noon of that <b>date</b> (the midpoint of the interval) in that
(normalized) timezone will always have the same <b>date</b> portion as the
<b>date</b> itself, even when that noon point in time is normalized to
UTC.  For example, 2002-10-10-05:00 begins during 2002-10-09Z and 2002-10-10+05:00
ends during 2002-10-11Z, but noon of both 2002-10-10-05:00 and 2002-10-10+05:00
falls in the interval which is 2002-10-10Z.
</div><div class="note"><b>Note:&#xa0;</b>See the conformance note in <a href="#year-sec-conformance"> (&#xa7;3.2.6)</a> which
applies to the year part of this datatype as well.</div><div class="div4">
<h5><a id="date-lexical-representation" name="date-lexical-representation"/>3.2.9.1 Lexical representation</h5><p>
For the following discussion, let the &quot;date portion&quot; of a <a href="#dateTime">dateTime</a>
or <b>date</b> object be an object similar to a <a href="#dateTime">dateTime</a> or
<b>date</b> object, with similar year, month, and day properties, but no
others, having the same value for these properties as the original
<a href="#dateTime">dateTime</a> or <b>date</b> object.
</p><p>
The <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of <b>date</b> consists of finite-length
sequences of characters of the form:
<code>'-'? yyyy '-' mm '-' dd zzzzzz?</code>
where the <b>date</b> and optional timezone are represented exactly the
same way as they are for <a href="#dateTime">dateTime</a>.  The first moment of the
interval is that represented by:
<code>'-' yyyy '-' mm '-' dd 'T00:00:00' zzzzzz?</code>
and the least upper bound of the interval is the timeline point represented
(noncanonically) by:
<code>'-' yyyy '-' mm '-' dd 'T24:00:00' zzzzzz?</code>.
</p><div class="note"><b>Note:&#xa0;</b>
The <a class="termref" href="#recoverable-timezone"><span class="arrow">&#xb7;</span>recoverable timezone<span class="arrow">&#xb7;</span></a> of a <b>date</b> will always be
a duration between '+12:00' and '11:59'.  Timezone lexical representations, as
explained for <a href="#dateTime">dateTime</a>, can range from '+14:00' to '-14:00'.
The result is that literals of <b>date</b>s with very large or very
negative timezones will map to a &quot;normalized&quot; <b>date</b> value with a
<a class="termref" href="#recoverable-timezone"><span class="arrow">&#xb7;</span>recoverable timezone<span class="arrow">&#xb7;</span></a> different from that represented in the original
representation, and a matching difference of +/- 1 day in the <b>date</b> itself.
</div></div><div class="div4">
<h5><a id="date-canonical-representation" name="date-canonical-representation"/>3.2.9.2 Canonical representation</h5><p>
Given a member of the <b>date</b> <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>, the
<b>date</b> portion of the canonical representation (the entire representation
for nontimezoned values, and all but the timezone representation for timezoned values)
is always the <b>date</b> portion of the <a href="#dateTime">dateTime</a> canonical
representation of the interval midpoint (the <a href="#dateTime">dateTime</a> representation,
truncated on the right to eliminate 'T' and all following characters).
For timezoned values, append the canonical representation of the <a class="termref" href="#recoverable-timezone"><span class="arrow">&#xb7;</span>recoverable timezone<span class="arrow">&#xb7;</span></a>.
</p></div></div><div class="div3">
<h4><a id="gYearMonth" name="gYearMonth"/>3.2.10 gYearMonth</h4><p>
<span class="termdef"><a id="dt-gYearMonth" name="dt-gYearMonth">[Definition:]&#xa0;&#xa0;</a>
<b>gYearMonth</b> represents a
specific gregorian month in a specific gregorian year.  The
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <b>gYearMonth</b>
is the set of Gregorian calendar months as defined in &#xa7; 5.2.1 of
<a href="#ISO8601">[ISO 8601]</a>.  Specifically, it is a set of one-month long,
non-periodic instances
e.g. 1999-10 to represent the whole month of 1999-10, independent of
how many days this month has.
</span>
</p><p>
Since the lexical representation allows an optional time zone
indicator, <b>gYearMonth</b> values are partially ordered because it may
not be possible to unequivocally determine the order of two values one of
which has a time zone and the other does not.  If <b>gYearMonth</b>
values are considered as periods of time, the order relation on
<b>gYearMonth</b> values is the order relation on their starting instants.
This is discussed in <a href="#dateTime-order">Order relation on dateTime (&#xa7;3.2.7.4)</a>.  See also
<a href="#adding-durations-to-dateTimes">Adding durations to dateTimes (&#xa7;E)</a>.  Pairs of <b>gYearMonth</b>
values with or without time zone indicators are totally ordered.
</p><div class="note"><b>Note:&#xa0;</b>
Because month/year combinations in one calendar only rarely correspond
to month/year combinations in other calendars, values of this type
are not, in general, convertible to simple values corresponding to month/year
combinations in other calendars.  This type should therefore be used with caution
in contexts where conversion to other calendars is desired.
</div><div class="note"><b>Note:&#xa0;</b>See the conformance note in <a href="#year-sec-conformance"> (&#xa7;3.2.6)</a> which
applies to the year part of this datatype as well.</div><div class="div4">
<h5><a id="gYearMonth-lexical-repr" name="gYearMonth-lexical-repr"/>3.2.10.1 Lexical representation</h5><p>
The lexical representation for <b>gYearMonth</b> is the reduced
(right truncated) lexical representation for <a href="#dateTime">dateTime</a>:
CCYY-MM.  No left truncation is allowed.  An optional following time
zone qualifier is allowed.  To accommodate year values outside the range from 0001 to 9999, additional digits
can be added to the left of this representation and a preceding &quot;-&quot; sign is allowed.
</p><p>
For example, to indicate the month of May 1999, one would write: 1999-05.
See also <a href="#isoformats">ISO 8601 Date and Time Formats (&#xa7;D)</a>.
</p></div><div class="div4">
<h5><a id="gYearMonth-facets" name="gYearMonth-facets"/>3.2.10.2 Constraining facets</h5><p><strong>gYearMonth</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-maxInclusive">maxInclusive</a></li><li><a href="#rf-maxExclusive">maxExclusive</a></li><li><a href="#rf-minInclusive">minInclusive</a></li><li><a href="#rf-minExclusive">minExclusive</a></li></ul></div></div><div class="div3">
<h4><a id="gYear" name="gYear"/>3.2.11 gYear</h4><p>
<span class="termdef"><a id="dt-gYear" name="dt-gYear">[Definition:]&#xa0;&#xa0;</a>
<b>gYear</b> represents a
gregorian calendar year.  The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of
<b>gYear</b> is the set of Gregorian calendar years as defined in
&#xa7; 5.2.1 of <a href="#ISO8601">[ISO 8601]</a>. Specifically, it is a set of one-year
long, non-periodic instances
e.g. lexical 1999 to represent the whole year 1999, independent of
how many months and days this year has.
</span>
</p><p>
Since the lexical representation allows an optional time zone
indicator, <b>gYear</b> values are partially ordered because it may
not be possible to unequivocally determine the order of two values one of which has a
time zone and the other does not.  If
<b>gYear</b> values are considered as periods of time, the order relation
on <b>gYear</b> values is the order relation on their starting instants.
This is discussed in <a href="#dateTime-order">Order relation on dateTime (&#xa7;3.2.7.4)</a>.  See also
<a href="#adding-durations-to-dateTimes">Adding durations to dateTimes (&#xa7;E)</a>.  Pairs of <b>gYear</b> values with or without time zone indicators are totally ordered.
</p><div class="note"><b>Note:&#xa0;</b>
Because years in one calendar only rarely correspond to years
in other calendars, values of this type
are not, in general, convertible to simple values corresponding to years
in other calendars.  This type should therefore be used with caution
in contexts where conversion to other calendars is desired.
</div><div class="note"><b>Note:&#xa0;</b>See the conformance note in <a href="#year-sec-conformance"> (&#xa7;3.2.6)</a> which
applies to the year part of this datatype as well.</div><div class="div4">
<h5><a id="gYear-lexical-repr" name="gYear-lexical-repr"/>3.2.11.1 Lexical representation</h5><p>
The lexical representation for <b>gYear</b> is the reduced (right
truncated) lexical representation for <a href="#dateTime">dateTime</a>: CCYY.
No left truncation is allowed.  An optional following time
zone qualifier is allowed as for <a href="#dateTime">dateTime</a>.   To
accommodate year values outside the range from 0001 to 9999, additional
digits can be added to the left of this representation and a preceding
&quot;-&quot; sign is allowed.
</p><p>
For example, to indicate 1999, one would write: 1999.
See also <a href="#isoformats">ISO 8601 Date and Time Formats (&#xa7;D)</a>.
</p></div><div class="div4">
<h5><a id="gYear-facets" name="gYear-facets"/>3.2.11.2 Constraining facets</h5><p><strong>gYear</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-maxInclusive">maxInclusive</a></li><li><a href="#rf-maxExclusive">maxExclusive</a></li><li><a href="#rf-minInclusive">minInclusive</a></li><li><a href="#rf-minExclusive">minExclusive</a></li></ul></div></div><div class="div3">
<h4><a id="gMonthDay" name="gMonthDay"/>3.2.12 gMonthDay</h4><p>
<span class="termdef"><a id="dt-gMonthDay" name="dt-gMonthDay">[Definition:]&#xa0;&#xa0;</a>
<b>gMonthDay</b> is a gregorian date that recurs, specifically a day of
the year such as the third of May.  Arbitrary recurring dates are not
supported by this datatype.  The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of
<b>gMonthDay</b> is the set of <em>calendar
dates</em>, as defined in &#xa7; 3 of <a href="#ISO8601">[ISO 8601]</a>.  Specifically,
it is a set of one-day long, annually periodic instances.
</span>
</p><p>
Since the lexical representation allows an optional time zone
indicator, <b>gMonthDay</b> values are partially ordered because it may
not be possible to unequivocally determine the order of two values one of which has a
time zone and the other does not.  If
<b>gMonthDay</b> values are considered as periods of time,
in an arbitrary leap year, the order relation
on <b>gMonthDay</b> values is the order relation on their starting instants.
This is discussed in <a href="#dateTime-order">Order relation on dateTime (&#xa7;3.2.7.4)</a>.  See also
<a href="#adding-durations-to-dateTimes">Adding durations to dateTimes (&#xa7;E)</a>.  Pairs of <b>gMonthDay</b> values with or without time zone indicators are totally ordered.
</p><div class="note"><b>Note:&#xa0;</b>
Because day/month combinations in one calendar only rarely correspond
to day/month combinations in other calendars, values of this type do not,
in general, have any straightforward or intuitive representation
in terms of most other calendars. This type should therefore be
used with caution in contexts where conversion to other calendars
is desired.
</div><div class="div4">
<h5><a id="gMonthDay-lexical-repr" name="gMonthDay-lexical-repr"/>3.2.12.1 Lexical representation</h5><p>
The lexical representation for <b>gMonthDay</b> is the left
truncated lexical representation for <a href="#date">date</a>: --MM-DD.
An optional following time
zone qualifier is allowed as for <a href="#date">date</a>.
No preceding sign is allowed.  No other formats are allowed. See also <a href="#isoformats">ISO 8601 Date and Time Formats (&#xa7;D)</a>.
</p><p>This datatype can be used to represent a specific day in a month.
To say, for example, that my birthday occurs on the 14th of September ever year.
</p></div><div class="div4">
<h5><a id="gMonthDay-facets" name="gMonthDay-facets"/>3.2.12.2 Constraining facets</h5><p><strong>gMonthDay</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-maxInclusive">maxInclusive</a></li><li><a href="#rf-maxExclusive">maxExclusive</a></li><li><a href="#rf-minInclusive">minInclusive</a></li><li><a href="#rf-minExclusive">minExclusive</a></li></ul></div></div><div class="div3">
<h4><a id="gDay" name="gDay"/>3.2.13 gDay</h4><p>
<span class="termdef"><a id="dt-gDay" name="dt-gDay">[Definition:]&#xa0;&#xa0;</a>
<b>gDay</b> is a gregorian day that recurs, specifically a day
of the month such as the 5th of the month.  Arbitrary recurring days
are not supported by this datatype.  The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
of <b>gDay</b> is the space of a set of <em>calendar
dates</em> as defined in &#xa7; 3 of <a href="#ISO8601">[ISO 8601]</a>.  Specifically,
it is a set of one-day long, monthly periodic instances.
</span>
</p><p>
This datatype can be used to represent a specific day of the month.
To say, for example, that I get my paycheck on the 15th of each month.
</p><p>
Since the lexical representation allows an optional time zone
indicator, <b>gDay</b> values are partially ordered because it may
not be possible to unequivocally determine the order of two values one of
which has a time zone and the other does not.  If
<b>gDay</b> values are considered as periods of time,
in an arbitrary month that has 31 days,
the order relation
on <b>gDay</b> values is the order relation on their starting instants.
This is discussed in <a href="#dateTime-order">Order relation on dateTime (&#xa7;3.2.7.4)</a>.  See also
<a href="#adding-durations-to-dateTimes">Adding durations to dateTimes (&#xa7;E)</a>.  Pairs of <b>gDay</b>
values with or without time zone indicators are totally ordered.
</p><div class="note"><b>Note:&#xa0;</b>
Because days in one calendar only rarely correspond
to days in other calendars, values of this type do not,
in general, have any straightforward or intuitive representation
in terms of most other calendars. This type should therefore be
used with caution in contexts where conversion to other calendars
is desired.
</div><div class="div4">
<h5><a id="gDay-lexical-repr" name="gDay-lexical-repr"/>3.2.13.1 Lexical representation</h5><p>
The lexical representation for <b>gDay</b> is the left
truncated lexical representation for <a href="#date">date</a>: ---DD .
An optional following time
zone qualifier is allowed as for <a href="#date">date</a>.  No preceding sign is
allowed. No other formats are allowed.  See also <a href="#isoformats">ISO 8601 Date and Time Formats (&#xa7;D)</a>.
</p></div><div class="div4">
<h5><a id="gDay-facets" name="gDay-facets"/>3.2.13.2 Constraining facets</h5><p><strong>gDay</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-maxInclusive">maxInclusive</a></li><li><a href="#rf-maxExclusive">maxExclusive</a></li><li><a href="#rf-minInclusive">minInclusive</a></li><li><a href="#rf-minExclusive">minExclusive</a></li></ul></div></div><div class="div3">
<h4><a id="gMonth" name="gMonth"/>3.2.14 gMonth</h4><p>
<span class="termdef"><a id="dt-gMonth" name="dt-gMonth">[Definition:]&#xa0;&#xa0;</a>
<b>gMonth</b> is a gregorian month that recurs every year.
The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
of <b>gMonth</b> is the space of a set of <em>calendar
months</em> as defined in &#xa7; 3 of <a href="#ISO8601">[ISO 8601]</a>.  Specifically,
it is a set of one-month long, yearly periodic instances.
</span>
</p><p>
This datatype can be used to represent a specific month.
To say, for example, that Thanksgiving falls in the month of November.
</p><p>
Since the lexical representation allows an optional time zone
indicator, <b>gMonth</b> values are partially ordered because it may
not be possible to unequivocally determine the order of two values one of which has a
time zone and the other does not.  If
<b>gMonth</b> values are considered as periods of time, the order relation
on <b>gMonth</b> is the order relation on their starting instants.
This is discussed in <a href="#dateTime-order">Order relation on dateTime (&#xa7;3.2.7.4)</a>.  See also
<a href="#adding-durations-to-dateTimes">Adding durations to dateTimes (&#xa7;E)</a>.  Pairs of <b>gMonth</b>
values with or without time zone indicators are totally ordered.
</p><div class="note"><b>Note:&#xa0;</b>
Because months in one calendar only rarely correspond
to months in other calendars, values of this type do not,
in general, have any straightforward or intuitive representation
in terms of most other calendars. This type should therefore be
used with caution in contexts where conversion to other calendars
is desired.
</div><div class="div4">
<h5><a id="gMonth-lexical-repr" name="gMonth-lexical-repr"/>3.2.14.1 Lexical representation</h5><p>
The lexical representation for <b>gMonth</b> is the left
and right truncated lexical representation for <a href="#date">date</a>: --MM.
An optional following time
zone qualifier is allowed as for <a href="#date">date</a>.  No preceding sign is
allowed. No other formats are allowed.  See also <a href="#isoformats">ISO 8601 Date and Time Formats (&#xa7;D)</a>.
</p></div><div class="div4">
<h5><a id="gMonth-facets" name="gMonth-facets"/>3.2.14.2 Constraining facets</h5><p><strong>gMonth</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-maxInclusive">maxInclusive</a></li><li><a href="#rf-maxExclusive">maxExclusive</a></li><li><a href="#rf-minInclusive">minInclusive</a></li><li><a href="#rf-minExclusive">minExclusive</a></li></ul></div></div><div class="div3">
<h4><a id="hexBinary" name="hexBinary"/>3.2.15 hexBinary</h4><p>
<span class="termdef"><a id="dt-hexBinary" name="dt-hexBinary">[Definition:]&#xa0;&#xa0;</a>
<b>hexBinary</b> represents
arbitrary hex-encoded binary data.  The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of
<b>hexBinary</b> is the set of finite-length sequences of binary
octets.
</span>
</p><div class="div4">
<h5><a id="hexBinary-lexical-representation" name="hexBinary-lexical-representation"/>3.2.15.1 Lexical Representation</h5><p>
<b>hexBinary</b> has a lexical representation where
each binary octet is encoded as a character tuple, consisting of two
hexadecimal digits ([0-9a-fA-F]) representing the octet code. For example,
&quot;0FB7&quot; is a <em>hex</em> encoding for the 16-bit integer 4023
(whose binary representation is 111110110111).
</p></div><div class="div4">
<h5><a id="hexBinary-canonical-repr" name="hexBinary-canonical-repr"/>3.2.15.2 Canonical Representation</h5><p>
The canonical representation for <b>hexBinary</b> is defined
by prohibiting certain options from the
<a href="#hexBinary-lexical-representation">Lexical Representation (&#xa7;3.2.15.1)</a>.  Specifically, the lower case
hexadecimal digits ([a-f]) are not allowed.
</p></div><div class="div4">
<h5><a id="hexBinary-facets" name="hexBinary-facets"/>3.2.15.3 Constraining facets</h5><p><strong>hexBinary</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-length">length</a></li><li><a href="#rf-minLength">minLength</a></li><li><a href="#rf-maxLength">maxLength</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li></ul></div></div><div class="div3">
<h4><a id="base64Binary" name="base64Binary"/>3.2.16 base64Binary</h4><p>
<span class="termdef"><a id="dt-base64Binary" name="dt-base64Binary">[Definition:]&#xa0;&#xa0;</a>
<b>base64Binary</b>
represents Base64-encoded arbitrary binary data.  The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of
<b>base64Binary</b> is the set of finite-length sequences of binary
octets. For <b>base64Binary</b> data the
entire binary stream is encoded using the Base64

Alphabet in
<a href="#RFC2045">[RFC 2045]</a>.
</span>
</p><p>
The lexical forms of <b>base64Binary</b> values are limited to the 65 characters
of the Base64 Alphabet defined in <a href="#RFC2045">[RFC 2045]</a>, i.e., <code>a-z</code>,
<code>A-Z</code>, <code>0-9</code>, the plus sign (+), the forward slash (/) and the
equal sign (=), together with the characters defined in <a href="#XML">[XML 1.0 (Second Edition)]</a> as white space.
No other characters are allowed.
</p><p>
For compatibility with older mail gateways, <a href="#RFC2045">[RFC 2045]</a> suggests that
base64 data should have lines limited to at most 76 characters in length.  This
line-length limitation is not mandated in the lexical forms of <b>base64Binary</b>
data and must not be enforced by XML Schema processors.
</p><p>
The lexical space of <b>base64Binary</b> is given by the following grammar
(the notation is that used in <a href="#XML">[XML 1.0 (Second Edition)]</a>); legal lexical forms must match
the <b>Base64Binary</b> production.
</p><p>
<code>Base64Binary&#xa0;&#xa0;::=&#xa0;&#xa0;((B64S B64S B64S B64S)*<br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;((B64S B64S B64S B64) |<br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;(B64S B64S B16S '=') |<br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;(B64S B04S '=' #x20? '=')))?<br/><br/>B64S &#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;::= B64 #x20?<br/><br/>
B16S&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;::= B16 #x20?<br/><br/>
B04S&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;::= B04 #x20?</code>
<code>
<br/><br/>
B04&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;[AQgw]<br/>
B16&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;[AEIMQUYcgkosw048]<br/>
B64&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;[A-Za-z0-9+/]
</code>
</p><p>
Note that this grammar requires the number of non-whitespace characters in the lexical
form to be a multiple of four, and for equals signs to appear only at the end of the
lexical form; strings which do not meet these constraints are not legal lexical forms
of <b>base64Binary</b> because they cannot successfully be decoded by base64
decoders.
</p><div class="note"><b>Note:&#xa0;</b>The above definition of the lexical space is more restrictive than that
given in <a href="#RFC2045">[RFC 2045]</a> as regards whitespace -- this is not an issue
in practice.  Any string compatible with the RFC can occur in
	    an element or attribute validated by this type, because the <a class="termref" href="#dt-whiteSpace"><span class="arrow">&#xb7;</span>whiteSpace<span class="arrow">&#xb7;</span></a> facet of this type is fixed
to <i>collapse</i>, which means that all leading and trailing whitespace
will be stripped, and all internal whitespace collapsed to single space
characters, <em>before</em> the above grammar is enforced.</div><p>
The canonical lexical form of a <b>base64Binary</b> data value is the base64
encoding of the value which matches the Canonical-base64Binary production in the following
grammar:
</p><p>
<code>Canonical-base64Binary&#xa0;&#xa0;::=&#xa0;&#xa0;(B64
B64 B64 B64)*<br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;((B64 B64 B16 '=') | (B64 B04 '=='))?</code>
</p><div class="note"><b>Note:&#xa0;</b>For some values the canonical form defined above does not conform to
<a href="#RFC2045">[RFC 2045]</a>, which requires
breaking with linefeeds at appropriate intervals.</div><p>
The length of a <b>base64Binary</b> value is the number of octets it contains.
This may be calculated from the lexical form by removing whitespace and padding characters
and performing the calculation shown in the pseudo-code below:
</p><p>
<code>
lex2&#xa0;&#xa0;&#xa0;&#xa0;:=&#xa0;killwhitespace(lexform)&#xa0;&#xa0;&#xa0;&#xa0;-- remove whitespace characters<br/>
lex3&#xa0;&#xa0;&#xa0;&#xa0;:=&#xa0;strip_equals(lex2)&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;-- strip padding characters at end<br/>
length&#xa0;&#xa0;:=&#xa0;floor (length(lex3) * 3 / 4)&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;-- calculate length
</code>
</p><p>
Note on encoding: <a href="#RFC2045">[RFC 2045]</a> explicitly references US-ASCII encoding.  However,
decoding of <b>base64Binary</b> data in an XML entity is to be performed on the
Unicode characters obtained after character encoding processing as specified by
<a href="#XML">[XML 1.0 (Second Edition)]</a>
</p><div class="div4">
<h5><a id="base64Binary-facets" name="base64Binary-facets"/>3.2.16.1 Constraining facets</h5><p><strong>base64Binary</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-length">length</a></li><li><a href="#rf-minLength">minLength</a></li><li><a href="#rf-maxLength">maxLength</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li></ul></div></div><div class="div3">
<h4><a id="anyURI" name="anyURI"/>3.2.17 anyURI</h4><p>
<span class="termdef"><a id="dt-anyURI" name="dt-anyURI">[Definition:]&#xa0;&#xa0;</a>
<b>anyURI</b> represents a Uniform Resource Identifier Reference
(URI).  An <b>anyURI</b> value can be absolute or relative, and may
have an optional fragment identifier (i.e., it may be a URI Reference).  This
type should be used to specify the intention that the value fulfills
the role of a URI as defined by <a href="#RFC2396">[RFC 2396]</a>, as amended by
<a href="#RFC2732">[RFC 2732]</a>.
</span>
</p><p>
The mapping from <b>anyURI</b> values to URIs is as
defined by the URI reference escaping procedure
defined in
Section 5.4 <a href="http://www.w3.org/TR/2001/REC-xlink-20010627/#link-locators">Locator Attribute</a>
of <a href="#XLink">[XML Linking Language]</a> (see also Section 8
<a href="http://www.w3.org/TR/2001/WD-charmod-20010126/#sec-URIs">Character Encoding in URI References</a>
of <a href="#CharMod">[Character Model]</a>).  This means
that a wide range of internationalized resource identifiers can be specified
when an <b>anyURI</b> is called for, and still be understood as
URIs per <a href="#RFC2396">[RFC 2396]</a>, as amended by <a href="#RFC2732">[RFC 2732]</a>,
where appropriate to identify resources.
</p><div class="note"><b>Note:&#xa0;</b>
Section 5.4 <a href="http://www.w3.org/TR/2001/REC-xlink-20010627/#link-locators">Locator Attribute</a>
of <a href="#XLink">[XML Linking Language]</a> requires that relative URI references be absolutized
as defined in <a href="#XBase">[XML Base]</a> before use.  This is an XLink-specific
requirement and is not appropriate for XML Schema, since neither the
<a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> nor the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
of the <a href="#anyURI">anyURI</a> type are restricted to absolute URIs.  Accordingly
absolutization must not be performed by schema processors as part of schema
validation.
</div><div class="note"><b>Note:&#xa0;</b>
Each URI scheme imposes specialized syntax rules for URIs in
that scheme, including restrictions on the syntax of allowed
fragment
identifiers. Because it is
impractical for processors to check that a value is a
context-appropriate URI reference, this specification follows the
lead of <a href="#RFC2396">[RFC 2396]</a> (as amended by <a href="#RFC2732">[RFC 2732]</a>)
in this matter: such rules and restrictions are not part of type validity
and are not checked by <a class="termref" href="#dt-minimally-conforming"><span class="arrow">&#xb7;</span>minimally conforming<span class="arrow">&#xb7;</span></a> processors.
Thus in practice the above definition imposes only very modest obligations
on <a class="termref" href="#dt-minimally-conforming"><span class="arrow">&#xb7;</span>minimally conforming<span class="arrow">&#xb7;</span></a> processors.
</div><div class="div4">
<h5><a id="anyURI-lexical-representation" name="anyURI-lexical-representation"/>3.2.17.1 Lexical representation</h5><p>
The <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of <b>anyURI</b> is
finite-length character sequences which, when the algorithm defined in
Section 5.4 of <a href="#XLink">[XML Linking Language]</a> is applied to them, result in strings
which are legal URIs according to <a href="#RFC2396">[RFC 2396]</a>, as amended by
<a href="#RFC2732">[RFC 2732]</a>.
</p><div class="note"><b>Note:&#xa0;</b>
Spaces are, in principle, allowed in the <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a>
of <b>anyURI</b>, however, their use is highly discouraged
(unless they are encoded by %20).
</div></div><div class="div4">
<h5><a id="anyURI-facets" name="anyURI-facets"/>3.2.17.2 Constraining facets</h5><p><strong>anyURI</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-length">length</a></li><li><a href="#rf-minLength">minLength</a></li><li><a href="#rf-maxLength">maxLength</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li></ul></div></div><div class="div3">
<h4><a id="QName" name="QName"/>3.2.18 QName</h4><p>
<span class="termdef"><a id="dt-QName" name="dt-QName">[Definition:]&#xa0;&#xa0;</a>
<b>QName</b> represents
<a href="http://www.w3.org/TR/1999/REC-xml-names-19990114/#dt-qname">XML qualified names</a>.
The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <b>QName</b> is the set of
tuples {<a href="http://www.w3.org/TR/1999/REC-xml-names-19990114/#dt-NSName">namespace name</a>,
<a href="http://www.w3.org/TR/1999/REC-xml-names-19990114/#dt-localname">local part</a>},
where <a href="http://www.w3.org/TR/1999/REC-xml-names-19990114/#dt-NSName">namespace name</a>
is an <a href="#anyURI">anyURI</a>
and <a href="http://www.w3.org/TR/1999/REC-xml-names-19990114/#dt-localname">local part</a> is
an <a href="#NCName">NCName</a>.

The <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of <b>QName</b> is the set
of strings that <a class="termref" href="#dt-match"><span class="arrow">&#xb7;</span>match<span class="arrow">&#xb7;</span></a> the <a href="http://www.w3.org/TR/1999/REC-xml-names-19990114/#NT-QName">
QName</a> production of <a href="#XMLNS">[Namespaces in XML]</a>.
</span>
</p><div class="note"><b>Note:&#xa0;</b>
The mapping between literals in the <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> and
values in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <b>QName</b> requires
a namespace declaration to be in scope for the context in which <b>QName</b>
is used.
</div><div class="div4">
<h5><a id="QName-facets" name="QName-facets"/>3.2.18.1 Constraining facets</h5><p><strong>QName</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-length">length</a></li><li><a href="#rf-minLength">minLength</a></li><li><a href="#rf-maxLength">maxLength</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li></ul><p>

The use of <a class="termref" href="#dt-length"><span class="arrow">&#xb7;</span>length<span class="arrow">&#xb7;</span></a>, <a class="termref" href="#dt-minLength"><span class="arrow">&#xb7;</span>minLength<span class="arrow">&#xb7;</span></a> and
<a class="termref" href="#dt-maxLength"><span class="arrow">&#xb7;</span>maxLength<span class="arrow">&#xb7;</span></a>
on datatypes <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from <a href="#QName">QName</a> is
deprecated.  Future versions of this specification may
remove these facets for this datatype.

</p></div></div><div class="div3">
<h4><a id="NOTATION" name="NOTATION"/>3.2.19 NOTATION</h4><p>
<span class="termdef"><a id="dt-NOTATION" name="dt-NOTATION">[Definition:]&#xa0;&#xa0;</a>
<b>NOTATION</b>
represents the <a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#NT-NotationType">NOTATION</a> attribute
type from <a href="#XML">[XML 1.0 (Second Edition)]</a>. The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
of <b>NOTATION</b> is the set of <a href="#QName">QName</a>s
of notations declared in the current schema.
The <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of <b>NOTATION</b> is the set
of all names of <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#declare-notation">notations</a>
declared in the current schema (in the form of <a href="#QName">QName</a>s).
</span>
</p><div class="constraintnote"><a name="enumeration-required-notation" id="enumeration-required-notation"/><b>Schema Component Constraint:  enumeration facet value required for NOTATION</b><br/><div class="constraint">
It is an <a class="termref" href="#dt-error"><span class="arrow">&#xb7;</span>error<span class="arrow">&#xb7;</span></a> for <b>NOTATION</b>
to be used directly in a schema.  Only datatypes that are
<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from <b>NOTATION</b> by
specifying a value for <a class="termref" href="#dt-enumeration"><span class="arrow">&#xb7;</span>enumeration<span class="arrow">&#xb7;</span></a> can be used
in a schema.
</div></div><p>
For compatibility (see <a href="#terminology">Terminology (&#xa7;1.4)</a>) <b>NOTATION</b>
should be used only on attributes
and should only be used in schemas with no
target namespace.
</p><div class="div4">
<h5><a id="NOTATION-facets" name="NOTATION-facets"/>3.2.19.1 Constraining facets</h5><p><strong>NOTATION</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-length">length</a></li><li><a href="#rf-minLength">minLength</a></li><li><a href="#rf-maxLength">maxLength</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li></ul><p>

The use of <a class="termref" href="#dt-length"><span class="arrow">&#xb7;</span>length<span class="arrow">&#xb7;</span></a>, <a class="termref" href="#dt-minLength"><span class="arrow">&#xb7;</span>minLength<span class="arrow">&#xb7;</span></a> and <a class="termref" href="#dt-maxLength"><span class="arrow">&#xb7;</span>maxLength<span class="arrow">&#xb7;</span></a>
on datatypes <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from <a href="#NOTATION">NOTATION</a> is
deprecated.  Future versions of this specification may
remove these facets for this datatype.

</p></div></div></div><div class="div2">
<h3 class="withToc"><span class="nav"><a class="nav" href="#built-in-primitive-datatypes"><img src="previous.jpg" alt="previous sub-section"/></a> </span><a id="built-in-derived" name="built-in-derived"/>3.3 Derived datatypes</h3><div class="localToc">&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.1 <a href="#normalizedString">normalizedString</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.2 <a href="#token">token</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.3 <a href="#language">language</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.4 <a href="#NMTOKEN">NMTOKEN</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.5 <a href="#NMTOKENS">NMTOKENS</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.6 <a href="#Name">Name</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.7 <a href="#NCName">NCName</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.8 <a href="#ID">ID</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.9 <a href="#IDREF">IDREF</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.10 <a href="#IDREFS">IDREFS</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.11 <a href="#ENTITY">ENTITY</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.12 <a href="#ENTITIES">ENTITIES</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.13 <a href="#integer">integer</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.14 <a href="#nonPositiveInteger">nonPositiveInteger</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.15 <a href="#negativeInteger">negativeInteger</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.16 <a href="#long">long</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.17 <a href="#int">int</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.18 <a href="#short">short</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.19 <a href="#byte">byte</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.20 <a href="#nonNegativeInteger">nonNegativeInteger</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.21 <a href="#unsignedLong">unsignedLong</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.22 <a href="#unsignedInt">unsignedInt</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.23 <a href="#unsignedShort">unsignedShort</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.24 <a href="#unsignedByte">unsignedByte</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;3.3.25 <a href="#positiveInteger">positiveInteger</a><br/>
</div><p>
This section gives conceptual definitions for all
<a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>&#xa0;<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> datatypes
defined by this specification. The XML representation used to define
<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> datatypes (whether
<a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a> or <a class="termref" href="#dt-user-derived"><span class="arrow">&#xb7;</span>user-derived<span class="arrow">&#xb7;</span></a>) is
given in section <a href="#xr-defn">XML Representation of Simple Type Definition Schema Components (&#xa7;4.1.2)</a> and the complete
definitions of the <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>&#xa0;
<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> datatypes are provided in Appendix A
<a href="#schema">Schema for Datatype Definitions (normative) (&#xa7;A)</a>.
</p><div class="div3">
<h4><a id="normalizedString" name="normalizedString"/>3.3.1 normalizedString</h4><p>
<span class="termdef"><a id="dt-normalizedString" name="dt-normalizedString">[Definition:]&#xa0;&#xa0;</a>
<b>normalizedString</b>
represents white space normalized strings.
The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <b>normalizedString</b> is the
set of strings that do not
contain the carriage return (#xD), line feed (#xA) nor tab (#x9) characters.
The <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of <b>normalizedString</b> is the
set of strings that do not
contain the carriage return (#xD),
line feed (#xA)
nor tab (#x9) characters.
The <a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a> of <b>normalizedString</b> is <a href="#string">string</a>.
</span>
</p><div class="div4">
<h5><a id="normalizedString-facets" name="normalizedString-facets"/>3.3.1.1 Constraining facets</h5><p><strong>normalizedString</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-length">length</a></li><li><a href="#rf-minLength">minLength</a></li><li><a href="#rf-maxLength">maxLength</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li></ul></div><div class="div4">
<h5><a id="normalizedString-derived-types" name="normalizedString-derived-types"/>3.3.1.2 Derived datatypes</h5><p>
			The following <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>
			datatypes are <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
			<strong>normalizedString</strong>:
		</p><ul><li><a href="#token">token</a></li></ul></div></div><div class="div3">
<h4><a id="token" name="token"/>3.3.2 token</h4><p>
<span class="termdef"><a id="dt-token" name="dt-token">[Definition:]&#xa0;&#xa0;</a>
<b>token</b>
represents tokenized strings.
The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <b>token</b> is the
set of strings that do not
contain the
carriage return (#xD),
line feed (#xA) nor tab (#x9) characters, that have no
leading or trailing spaces (#x20) and that have no internal sequences
of two or more spaces.
The <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of <b>token</b> is the
set of strings that do not contain the
carriage return (#xD),
line feed (#xA) nor tab (#x9) characters, that have no
leading or trailing spaces (#x20) and that have no internal sequences
of two or more spaces.
The <a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a> of <b>token</b> is <a href="#normalizedString">normalizedString</a>.
</span>
</p><div class="div4">
<h5><a id="token-facets" name="token-facets"/>3.3.2.1 Constraining facets</h5><p><strong>token</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-length">length</a></li><li><a href="#rf-minLength">minLength</a></li><li><a href="#rf-maxLength">maxLength</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li></ul></div><div class="div4">
<h5><a id="token-derived-types" name="token-derived-types"/>3.3.2.2 Derived datatypes</h5><p>
			The following <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>
			datatypes are <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
			<strong>token</strong>:
		</p><ul><li><a href="#language">language</a></li><li><a href="#NMTOKEN">NMTOKEN</a></li><li><a href="#Name">Name</a></li></ul></div></div><div class="div3">
<h4><a id="language" name="language"/>3.3.3 language</h4><p>
<span class="termdef"><a id="dt-language" name="dt-language">[Definition:]&#xa0;&#xa0;</a>
<b>language</b>
represents natural language identifiers as defined by
by <a href="#RFC3066">[RFC 3066]</a>
.
The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <b>language</b> is the
set of all strings that are valid language identifiers as defined
<a href="#RFC3066">[RFC 3066]</a>
.
The <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of
<b>language</b> is the set of all strings that
conform to the pattern <code>[a-zA-Z]{1,8}(-[a-zA-Z0-9]{1,8})*</code>
.
The <a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a> of <b>language</b> is <a href="#token">token</a>.
</span>
</p><div class="div4">
<h5><a id="language-facets" name="language-facets"/>3.3.3.1 Constraining facets</h5><p><strong>language</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-length">length</a></li><li><a href="#rf-minLength">minLength</a></li><li><a href="#rf-maxLength">maxLength</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li></ul></div></div><div class="div3">
<h4><a id="NMTOKEN" name="NMTOKEN"/>3.3.4 NMTOKEN</h4><p>
<span class="termdef"><a id="dt-NMTOKEN" name="dt-NMTOKEN">[Definition:]&#xa0;&#xa0;</a>
<b>NMTOKEN</b> represents
the <a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#NT-TokenizedType">NMTOKEN attribute type</a>
from <a href="#XML">[XML 1.0 (Second Edition)]</a>. The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of
<b>NMTOKEN</b> is the set of tokens that <a class="termref" href="#dt-match"><span class="arrow">&#xb7;</span>match<span class="arrow">&#xb7;</span></a>
the <a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#NT-Nmtoken">Nmtoken</a> production in
<a href="#XML">[XML 1.0 (Second Edition)]</a>. The <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of
<b>NMTOKEN</b> is the set of strings that <a class="termref" href="#dt-match"><span class="arrow">&#xb7;</span>match<span class="arrow">&#xb7;</span></a>
the <a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#NT-Nmtoken">Nmtoken</a> production in
<a href="#XML">[XML 1.0 (Second Edition)]</a>.  The <a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a> of
<b>NMTOKEN</b> is <a href="#token">token</a>.
</span>
</p><p>
For compatibility (see <a href="#terminology">Terminology (&#xa7;1.4)</a>) <b>NMTOKEN</b>
should be used only on attributes.
</p><div class="div4">
<h5><a id="NMTOKEN-facets" name="NMTOKEN-facets"/>3.3.4.1 Constraining facets</h5><p><strong>NMTOKEN</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-length">length</a></li><li><a href="#rf-minLength">minLength</a></li><li><a href="#rf-maxLength">maxLength</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li></ul></div><div class="div4">
<h5><a id="NMTOKEN-derived-types" name="NMTOKEN-derived-types"/>3.3.4.2 Derived datatypes</h5><p>
			The following <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>
			datatypes are <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
			<strong>NMTOKEN</strong>:
		</p><ul><li><a href="#NMTOKENS">NMTOKENS</a></li></ul></div></div><div class="div3">
<h4><a id="NMTOKENS" name="NMTOKENS"/>3.3.5 NMTOKENS</h4><p>
<span class="termdef"><a id="dt-NMTOKENS" name="dt-NMTOKENS">[Definition:]&#xa0;&#xa0;</a>
<b>NMTOKENS</b>
represents the <a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#NT-TokenizedType">NMTOKENS attribute
type</a> from <a href="#XML">[XML 1.0 (Second Edition)]</a>. The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
of <b>NMTOKENS</b> is the set of finite, non-zero-length sequences of
<a class="termref" href="#dt-NMTOKEN"><span class="arrow">&#xb7;</span>NMTOKEN<span class="arrow">&#xb7;</span></a>s.  The <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a>
of <b>NMTOKENS</b> is the set of space-separated lists of tokens,
of which each token is in the <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of
<a href="#NMTOKEN">NMTOKEN</a>.  The <a class="termref" href="#dt-itemType"><span class="arrow">&#xb7;</span>itemType<span class="arrow">&#xb7;</span></a> of
<b>NMTOKENS</b> is <a href="#NMTOKEN">NMTOKEN</a>.
</span>
</p><p>
For compatibility (see <a href="#terminology">Terminology (&#xa7;1.4)</a>)
<b>NMTOKENS</b> should be used only on attributes.
</p><div class="div4">
<h5><a id="NMTOKENS-facets" name="NMTOKENS-facets"/>3.3.5.1 Constraining facets</h5><p><strong>NMTOKENS</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-length">length</a></li><li><a href="#rf-minLength">minLength</a></li><li><a href="#rf-maxLength">maxLength</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-pattern">pattern</a></li></ul></div></div><div class="div3">
<h4><a id="Name" name="Name"/>3.3.6 Name</h4><p>
<span class="termdef"><a id="dt-Name" name="dt-Name">[Definition:]&#xa0;&#xa0;</a>
<b>Name</b>
represents <a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#dt-name">XML Names</a>.
The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <b>Name</b> is
the set of all strings which <a class="termref" href="#dt-match"><span class="arrow">&#xb7;</span>match<span class="arrow">&#xb7;</span></a> the
<a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#NT-Name">Name</a> production of
<a href="#XML">[XML 1.0 (Second Edition)]</a>.  The <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of
<b>Name</b> is the set of all strings which <a class="termref" href="#dt-match"><span class="arrow">&#xb7;</span>match<span class="arrow">&#xb7;</span></a>
the <a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#NT-Name">Name</a> production of
<a href="#XML">[XML 1.0 (Second Edition)]</a>. The <a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a> of <b>Name</b>
is <a href="#token">token</a>.
</span>
</p><div class="div4">
<h5><a id="Name-facets" name="Name-facets"/>3.3.6.1 Constraining facets</h5><p><strong>Name</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-length">length</a></li><li><a href="#rf-minLength">minLength</a></li><li><a href="#rf-maxLength">maxLength</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li></ul></div><div class="div4">
<h5><a id="Name-derived-types" name="Name-derived-types"/>3.3.6.2 Derived datatypes</h5><p>
			The following <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>
			datatypes are <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
			<strong>Name</strong>:
		</p><ul><li><a href="#NCName">NCName</a></li></ul></div></div><div class="div3">
<h4><a id="NCName" name="NCName"/>3.3.7 NCName</h4><p>
<span class="termdef"><a id="dt-NCName" name="dt-NCName">[Definition:]&#xa0;&#xa0;</a>
<b>NCName</b> represents XML
&quot;non-colonized&quot; Names.  The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of
<b>NCName</b> is the set of all strings which <a class="termref" href="#dt-match"><span class="arrow">&#xb7;</span>match<span class="arrow">&#xb7;</span></a>
the <a href="http://www.w3.org/TR/1999/REC-xml-names-19990114/#NT-NCName">NCName</a> production of
<a href="#XMLNS">[Namespaces in XML]</a>.  The <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of
<b>NCName</b> is the set of all strings which <a class="termref" href="#dt-match"><span class="arrow">&#xb7;</span>match<span class="arrow">&#xb7;</span></a>
the <a href="http://www.w3.org/TR/1999/REC-xml-names-19990114/#NT-NCName">NCName</a> production of
<a href="#XMLNS">[Namespaces in XML]</a>.  The <a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a> of
<b>NCName</b> is <a href="#Name">Name</a>.
</span>
</p><div class="div4">
<h5><a id="NCName-facets" name="NCName-facets"/>3.3.7.1 Constraining facets</h5><p><strong>NCName</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-length">length</a></li><li><a href="#rf-minLength">minLength</a></li><li><a href="#rf-maxLength">maxLength</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li></ul></div><div class="div4">
<h5><a id="NCName-derived-types" name="NCName-derived-types"/>3.3.7.2 Derived datatypes</h5><p>
			The following <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>
			datatypes are <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
			<strong>NCName</strong>:
		</p><ul><li><a href="#ID">ID</a></li><li><a href="#IDREF">IDREF</a></li><li><a href="#ENTITY">ENTITY</a></li></ul></div></div><div class="div3">
<h4><a id="ID" name="ID"/>3.3.8 ID</h4><p>
<span class="termdef"><a id="dt-ID" name="dt-ID">[Definition:]&#xa0;&#xa0;</a>
<b>ID</b> represents the
<a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#NT-TokenizedType">ID attribute type</a> from
<a href="#XML">[XML 1.0 (Second Edition)]</a>.  The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of
<b>ID</b> is the set of all strings that <a class="termref" href="#dt-match"><span class="arrow">&#xb7;</span>match<span class="arrow">&#xb7;</span></a>
the <a href="http://www.w3.org/TR/1999/REC-xml-names-19990114/#NT-NCName">NCName</a> production in
<a href="#XMLNS">[Namespaces in XML]</a>.  The
<a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of <b>ID</b> is the set of all
strings that <a class="termref" href="#dt-match"><span class="arrow">&#xb7;</span>match<span class="arrow">&#xb7;</span></a> the
<a href="http://www.w3.org/TR/1999/REC-xml-names-19990114/#NT-NCName">NCName</a> production in
<a href="#XMLNS">[Namespaces in XML]</a>.
The <a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a> of <b>ID</b> is <a href="#NCName">NCName</a>.
</span>
</p><p>
For compatibility (see <a href="#terminology">Terminology (&#xa7;1.4)</a>)
<b>ID</b> should be used only on attributes.
</p><div class="div4">
<h5><a id="ID-facets" name="ID-facets"/>3.3.8.1 Constraining facets</h5><p><strong>ID</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-length">length</a></li><li><a href="#rf-minLength">minLength</a></li><li><a href="#rf-maxLength">maxLength</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li></ul></div></div><div class="div3">
<h4><a id="IDREF" name="IDREF"/>3.3.9 IDREF</h4><p>
<span class="termdef"><a id="dt-IDREF" name="dt-IDREF">[Definition:]&#xa0;&#xa0;</a>
<b>IDREF</b> represents the
<a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#NT-TokenizedType">IDREF attribute type</a> from
<a href="#XML">[XML 1.0 (Second Edition)]</a>.  The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of
<b>IDREF</b> is the set of all strings that <a class="termref" href="#dt-match"><span class="arrow">&#xb7;</span>match<span class="arrow">&#xb7;</span></a>
the <a href="http://www.w3.org/TR/1999/REC-xml-names-19990114/#NT-NCName">NCName</a> production in
<a href="#XMLNS">[Namespaces in XML]</a>.  The
<a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of <b>IDREF</b> is the set of
strings that <a class="termref" href="#dt-match"><span class="arrow">&#xb7;</span>match<span class="arrow">&#xb7;</span></a> the
<a href="http://www.w3.org/TR/1999/REC-xml-names-19990114/#NT-NCName">NCName</a> production in
<a href="#XMLNS">[Namespaces in XML]</a>.
The <a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a> of <b>IDREF</b> is <a href="#NCName">NCName</a>.
</span>
</p><p>
For compatibility (see <a href="#terminology">Terminology (&#xa7;1.4)</a>) this datatype
should be used only on attributes.
</p><div class="div4">
<h5><a id="IDREF-facets" name="IDREF-facets"/>3.3.9.1 Constraining facets</h5><p><strong>IDREF</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-length">length</a></li><li><a href="#rf-minLength">minLength</a></li><li><a href="#rf-maxLength">maxLength</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li></ul></div><div class="div4">
<h5><a id="IDREF-derived-types" name="IDREF-derived-types"/>3.3.9.2 Derived datatypes</h5><p>
			The following <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>
			datatypes are <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
			<strong>IDREF</strong>:
		</p><ul><li><a href="#IDREFS">IDREFS</a></li></ul></div></div><div class="div3">
<h4><a id="IDREFS" name="IDREFS"/>3.3.10 IDREFS</h4><p>
<span class="termdef"><a id="dt-IDREFS" name="dt-IDREFS">[Definition:]&#xa0;&#xa0;</a>
<b>IDREFS</b> represents the
<a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#NT-TokenizedType">IDREFS attribute type</a> from
<a href="#XML">[XML 1.0 (Second Edition)]</a>.  The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of
<b>IDREFS</b> is the set of finite, non-zero-length sequences of
<a href="#IDREF">IDREF</a>s.
The <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of <b>IDREFS</b> is the
set of space-separated lists of tokens, of which each token is in the
<a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of <a href="#IDREF">IDREF</a>.
The <a class="termref" href="#dt-itemType"><span class="arrow">&#xb7;</span>itemType<span class="arrow">&#xb7;</span></a> of <b>IDREFS</b> is
<a href="#IDREF">IDREF</a>.
</span>
</p><p>
For compatibility (see <a href="#terminology">Terminology (&#xa7;1.4)</a>) <b>IDREFS</b>
should be used only on attributes.
</p><div class="div4">
<h5><a id="IDREFS-facets" name="IDREFS-facets"/>3.3.10.1 Constraining facets</h5><p><strong>IDREFS</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-length">length</a></li><li><a href="#rf-minLength">minLength</a></li><li><a href="#rf-maxLength">maxLength</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-pattern">pattern</a></li></ul></div></div><div class="div3">
<h4><a id="ENTITY" name="ENTITY"/>3.3.11 ENTITY</h4><p>
<span class="termdef"><a id="dt-ENTITY" name="dt-ENTITY">[Definition:]&#xa0;&#xa0;</a>
<b>ENTITY</b> represents the
<a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#NT-TokenizedType">ENTITY</a> attribute type from
<a href="#XML">[XML 1.0 (Second Edition)]</a>.  The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of
<b>ENTITY</b> is the set of all strings that <a class="termref" href="#dt-match"><span class="arrow">&#xb7;</span>match<span class="arrow">&#xb7;</span></a>
the <a href="http://www.w3.org/TR/1999/REC-xml-names-19990114/#NT-NCName">NCName</a> production in
<a href="#XMLNS">[Namespaces in XML]</a> and have been declared as an
<a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#dt-unparsed">unparsed entity</a> in
a <a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#dt-doctype">document type definition</a>.
The <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of <b>ENTITY</b> is the set
of all strings that <a class="termref" href="#dt-match"><span class="arrow">&#xb7;</span>match<span class="arrow">&#xb7;</span></a> the
<a href="http://www.w3.org/TR/1999/REC-xml-names-19990114/#NT-NCName">NCName</a> production in
<a href="#XMLNS">[Namespaces in XML]</a>.
The <a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a> of <b>ENTITY</b> is <a href="#NCName">NCName</a>.
</span>
</p><div class="note"><b>Note:&#xa0;</b>
The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <b>ENTITY</b> is scoped
to a specific instance document.
</div><p>
For compatibility (see <a href="#terminology">Terminology (&#xa7;1.4)</a>) <b>ENTITY</b>
should be used only on attributes.
</p><div class="div4">
<h5><a id="ENTITY-facets" name="ENTITY-facets"/>3.3.11.1 Constraining facets</h5><p><strong>ENTITY</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-length">length</a></li><li><a href="#rf-minLength">minLength</a></li><li><a href="#rf-maxLength">maxLength</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li></ul></div><div class="div4">
<h5><a id="ENTITY-derived-types" name="ENTITY-derived-types"/>3.3.11.2 Derived datatypes</h5><p>
			The following <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>
			datatypes are <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
			<strong>ENTITY</strong>:
		</p><ul><li><a href="#ENTITIES">ENTITIES</a></li></ul></div></div><div class="div3">
<h4><a id="ENTITIES" name="ENTITIES"/>3.3.12 ENTITIES</h4><p>
<span class="termdef"><a id="dt-ENTITIES" name="dt-ENTITIES">[Definition:]&#xa0;&#xa0;</a>
<b>ENTITIES</b>
represents the <a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#NT-TokenizedType">ENTITIES attribute
type</a> from <a href="#XML">[XML 1.0 (Second Edition)]</a>. The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
of <b>ENTITIES</b> is the set of finite, non-zero-length sequences of
<a class="termref" href="#dt-ENTITY"><span class="arrow">&#xb7;</span>ENTITY<span class="arrow">&#xb7;</span></a>s that have been declared as
<a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#dt-unparsed">unparsed entities</a>
in a <a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#dt-doctype">document type definition</a>.
The <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of <b>ENTITIES</b> is the
set of space-separated lists of tokens, of which each token is in the
<a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of <a href="#ENTITY">ENTITY</a>.
The <a class="termref" href="#dt-itemType"><span class="arrow">&#xb7;</span>itemType<span class="arrow">&#xb7;</span></a> of <b>ENTITIES</b> is
<a href="#ENTITY">ENTITY</a>.
</span>
</p><div class="note"><b>Note:&#xa0;</b>
The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <b>ENTITIES</b> is scoped
to a specific instance document.
</div><p>
For compatibility (see <a href="#terminology">Terminology (&#xa7;1.4)</a>) <b>ENTITIES</b>
should be used only on attributes.
</p><div class="div4">
<h5><a id="ENTITIES-facets" name="ENTITIES-facets"/>3.3.12.1 Constraining facets</h5><p><strong>ENTITIES</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-length">length</a></li><li><a href="#rf-minLength">minLength</a></li><li><a href="#rf-maxLength">maxLength</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-pattern">pattern</a></li></ul></div></div><div class="div3">
<h4><a id="integer" name="integer"/>3.3.13 integer</h4><p>
<span class="termdef"><a id="dt-integer" name="dt-integer">[Definition:]&#xa0;&#xa0;</a>
<b>integer</b> is
<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from <a href="#decimal">decimal</a> by fixing the
value of <a class="termref" href="#dt-fractionDigits"><span class="arrow">&#xb7;</span>fractionDigits<span class="arrow">&#xb7;</span></a> to be 0and
disallowing the trailing decimal point.
This results in the standard
mathematical concept of the integer numbers. The
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <b>integer</b> is the infinite
set {...,-2,-1,0,1,2,...}.  The <a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a> of
<b>integer</b> is <a href="#decimal">decimal</a>.
</span>
</p><div class="div4">
<h5><a id="integer-lexical-representation" name="integer-lexical-representation"/>3.3.13.1 Lexical representation</h5><p>
<b>integer</b> has a lexical representation consisting of a finite-length sequence
of decimal digits (#x30-#x39) with an optional leading sign.  If the sign is omitted,
&quot;+&quot; is assumed.  For example: -1, 0, 12678967543233, +100000.
</p></div><div class="div4">
<h5><a id="integer-canonical-repr" name="integer-canonical-repr"/>3.3.13.2 Canonical representation</h5><p>
The canonical representation for <b>integer</b> is defined
by prohibiting certain options from the
<a href="#integer-lexical-representation">Lexical representation (&#xa7;3.3.13.1)</a>.  Specifically, the preceding optional &quot;+&quot; sign is prohibited and leading zeroes are prohibited.
</p></div><div class="div4">
<h5><a id="integer-facets" name="integer-facets"/>3.3.13.3 Constraining facets</h5><p><strong>integer</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-totalDigits">totalDigits</a></li><li><a href="#rf-fractionDigits">fractionDigits</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-maxInclusive">maxInclusive</a></li><li><a href="#rf-maxExclusive">maxExclusive</a></li><li><a href="#rf-minInclusive">minInclusive</a></li><li><a href="#rf-minExclusive">minExclusive</a></li></ul></div><div class="div4">
<h5><a id="integer-derived-types" name="integer-derived-types"/>3.3.13.4 Derived datatypes</h5><p>
			The following <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>
			datatypes are <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
			<strong>integer</strong>:
		</p><ul><li><a href="#nonPositiveInteger">nonPositiveInteger</a></li><li><a href="#long">long</a></li><li><a href="#nonNegativeInteger">nonNegativeInteger</a></li></ul></div></div><div class="div3">
<h4><a id="nonPositiveInteger" name="nonPositiveInteger"/>3.3.14 nonPositiveInteger</h4><p>
<span class="termdef"><a id="dt-nonPositiveInteger" name="dt-nonPositiveInteger">[Definition:]&#xa0;&#xa0;</a>
<b>nonPositiveInteger</b> is <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
<a href="#integer">integer</a> by setting the value of
<a class="termref" href="#dt-maxInclusive"><span class="arrow">&#xb7;</span>maxInclusive<span class="arrow">&#xb7;</span></a> to be 0.  This results in the
standard mathematical concept of the non-positive integers.
The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <b>nonPositiveInteger</b>
is the infinite set {...,-2,-1,0}.  The <a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a>
of <b>nonPositiveInteger</b> is <a href="#integer">integer</a>.
</span>
</p><div class="div4">
<h5><a id="nonPositiveInteger-lexical-representation" name="nonPositiveInteger-lexical-representation"/>3.3.14.1 Lexical representation</h5><p>
<b>nonPositiveInteger</b> has a lexical representation consisting of
an optional preceding sign

followed by a finite-length sequence of decimal digits (#x30-#x39).

The sign may be &quot;+&quot; or may be omitted only for
lexical forms denoting zero; in all other lexical forms, the negative
sign (&quot;-&quot;) must be present.
For example: -1, 0, -12678967543233, -100000.
</p></div><div class="div4">
<h5><a id="nonPositiveInteger-canonical-repr" name="nonPositiveInteger-canonical-repr"/>3.3.14.2 Canonical representation</h5><p>
The canonical representation for <b>nonPositiveInteger</b> is defined
by prohibiting certain options from the
<a href="#nonPositiveInteger-lexical-representation">Lexical representation (&#xa7;3.3.14.1)</a>.

In the canonical form for zero, the sign must be
omitted.  Leading zeroes are prohibited.
</p></div><div class="div4">
<h5><a id="nonPositiveInteger-facets" name="nonPositiveInteger-facets"/>3.3.14.3 Constraining facets</h5><p><strong>nonPositiveInteger</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-totalDigits">totalDigits</a></li><li><a href="#rf-fractionDigits">fractionDigits</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-maxInclusive">maxInclusive</a></li><li><a href="#rf-maxExclusive">maxExclusive</a></li><li><a href="#rf-minInclusive">minInclusive</a></li><li><a href="#rf-minExclusive">minExclusive</a></li></ul></div><div class="div4">
<h5><a id="nonPositiveInteger-derived-types" name="nonPositiveInteger-derived-types"/>3.3.14.4 Derived datatypes</h5><p>
			The following <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>
			datatypes are <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
			<strong>nonPositiveInteger</strong>:
		</p><ul><li><a href="#negativeInteger">negativeInteger</a></li></ul></div></div><div class="div3">
<h4><a id="negativeInteger" name="negativeInteger"/>3.3.15 negativeInteger</h4><p>
<span class="termdef"><a id="dt-negativeInteger" name="dt-negativeInteger">[Definition:]&#xa0;&#xa0;</a>
<b>negativeInteger</b> is <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
<a href="#nonPositiveInteger">nonPositiveInteger</a> by setting the value of
<a class="termref" href="#dt-maxInclusive"><span class="arrow">&#xb7;</span>maxInclusive<span class="arrow">&#xb7;</span></a> to be -1.  This results in the
standard mathematical concept of the negative integers.  The
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <b>negativeInteger</b>
is the infinite set {...,-2,-1}.  The <a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a>
of <b>negativeInteger</b>  is <a href="#nonPositiveInteger">nonPositiveInteger</a>.
</span>
</p><div class="div4">
<h5><a id="negativeInteger-lexical-representation" name="negativeInteger-lexical-representation"/>3.3.15.1 Lexical representation</h5><p>
<b>negativeInteger</b> has a lexical representation consisting of
a negative sign (&quot;-&quot;) followed by a finite-length
sequence of decimal digits (#x30-#x39).  For example: -1, -12678967543233, -100000.
</p></div><div class="div4">
<h5><a id="negativeInteger-canonical-repr" name="negativeInteger-canonical-repr"/>3.3.15.2 Canonical representation</h5><p>
The canonical representation for <b>negativeInteger</b> is defined
by prohibiting certain options from the
<a href="#negativeInteger-lexical-representation">Lexical representation (&#xa7;3.3.15.1)</a>.  Specifically,  leading zeroes are prohibited.
</p></div><div class="div4">
<h5><a id="negativeInteger-facets" name="negativeInteger-facets"/>3.3.15.3 Constraining facets</h5><p><strong>negativeInteger</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-totalDigits">totalDigits</a></li><li><a href="#rf-fractionDigits">fractionDigits</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-maxInclusive">maxInclusive</a></li><li><a href="#rf-maxExclusive">maxExclusive</a></li><li><a href="#rf-minInclusive">minInclusive</a></li><li><a href="#rf-minExclusive">minExclusive</a></li></ul></div></div><div class="div3">
<h4><a id="long" name="long"/>3.3.16 long</h4><p>
<span class="termdef"><a id="dt-long" name="dt-long">[Definition:]&#xa0;&#xa0;</a>
<b>long</b> is
<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from <a href="#integer">integer</a> by setting the
value of <a class="termref" href="#dt-maxInclusive"><span class="arrow">&#xb7;</span>maxInclusive<span class="arrow">&#xb7;</span></a> to be 9223372036854775807
and <a class="termref" href="#dt-minInclusive"><span class="arrow">&#xb7;</span>minInclusive<span class="arrow">&#xb7;</span></a> to be -9223372036854775808.
The <a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a> of <b>long</b> is
<a href="#integer">integer</a>.
</span>
</p><div class="div4">
<h5><a id="long-lexical-representation" name="long-lexical-representation"/>3.3.16.1 Lexical representation</h5><p>
<b>long</b> has a lexical representation consisting
of an optional sign followed by a finite-length
sequence of decimal digits (#x30-#x39).  If the sign is omitted, &quot;+&quot; is assumed.
For example: -1, 0,
12678967543233, +100000.
</p></div><div class="div4">
<h5><a id="long-canonical-repr" name="long-canonical-repr"/>3.3.16.2 Canonical representation</h5><p>
The canonical representation for <b>long</b> is defined
by prohibiting certain options from the
<a href="#long-lexical-representation">Lexical representation (&#xa7;3.3.16.1)</a>.  Specifically, the
the optional &quot;+&quot; sign is prohibited and leading zeroes are prohibited.
</p></div><div class="div4">
<h5><a id="long-facets" name="long-facets"/>3.3.16.3 Constraining facets</h5><p><strong>long</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-totalDigits">totalDigits</a></li><li><a href="#rf-fractionDigits">fractionDigits</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-maxInclusive">maxInclusive</a></li><li><a href="#rf-maxExclusive">maxExclusive</a></li><li><a href="#rf-minInclusive">minInclusive</a></li><li><a href="#rf-minExclusive">minExclusive</a></li></ul></div><div class="div4">
<h5><a id="long-derived-types" name="long-derived-types"/>3.3.16.4 Derived datatypes</h5><p>
			The following <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>
			datatypes are <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
			<strong>long</strong>:
		</p><ul><li><a href="#int">int</a></li></ul></div></div><div class="div3">
<h4><a id="int" name="int"/>3.3.17 int</h4><p>
<span class="termdef"><a id="dt-int" name="dt-int">[Definition:]&#xa0;&#xa0;</a>
<b>int</b>
is <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from <a href="#long">long</a> by setting the
value of <a class="termref" href="#dt-maxInclusive"><span class="arrow">&#xb7;</span>maxInclusive<span class="arrow">&#xb7;</span></a> to be 2147483647 and
<a class="termref" href="#dt-minInclusive"><span class="arrow">&#xb7;</span>minInclusive<span class="arrow">&#xb7;</span></a> to be -2147483648.  The
<a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a> of <b>int</b> is <a href="#long">long</a>.
</span>
</p><div class="div4">
<h5><a id="int-lexical-representation" name="int-lexical-representation"/>3.3.17.1 Lexical representation</h5><p>
<b>int</b> has a lexical representation consisting
of an optional sign followed by a finite-length
sequence of decimal digits (#x30-#x39).  If the sign is omitted, &quot;+&quot; is assumed.
For example: -1, 0,
126789675, +100000.
</p></div><div class="div4">
<h5><a id="int-canonical-repr" name="int-canonical-repr"/>3.3.17.2 Canonical representation</h5><p>
The canonical representation for <b>int</b> is defined
by prohibiting certain options from the
<a href="#int-lexical-representation">Lexical representation (&#xa7;3.3.17.1)</a>.  Specifically, the
the optional &quot;+&quot; sign is prohibited and leading zeroes are prohibited.
</p></div><div class="div4">
<h5><a id="int-facets" name="int-facets"/>3.3.17.3 Constraining facets</h5><p><strong>int</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-totalDigits">totalDigits</a></li><li><a href="#rf-fractionDigits">fractionDigits</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-maxInclusive">maxInclusive</a></li><li><a href="#rf-maxExclusive">maxExclusive</a></li><li><a href="#rf-minInclusive">minInclusive</a></li><li><a href="#rf-minExclusive">minExclusive</a></li></ul></div><div class="div4">
<h5><a id="int-derived-types" name="int-derived-types"/>3.3.17.4 Derived datatypes</h5><p>
			The following <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>
			datatypes are <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
			<strong>int</strong>:
		</p><ul><li><a href="#short">short</a></li></ul></div></div><div class="div3">
<h4><a id="short" name="short"/>3.3.18 short</h4><p>
<span class="termdef"><a id="dt-short" name="dt-short">[Definition:]&#xa0;&#xa0;</a>
<b>short</b> is
<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from <a href="#int">int</a> by setting the
value of <a class="termref" href="#dt-maxInclusive"><span class="arrow">&#xb7;</span>maxInclusive<span class="arrow">&#xb7;</span></a> to be 32767 and
<a class="termref" href="#dt-minInclusive"><span class="arrow">&#xb7;</span>minInclusive<span class="arrow">&#xb7;</span></a> to be -32768.  The
<a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a> of <b>short</b> is
<a href="#int">int</a>.
</span>
</p><div class="div4">
<h5><a id="short-lexical-representation" name="short-lexical-representation"/>3.3.18.1 Lexical representation</h5><p>
<b>short</b> has a lexical representation consisting
of an optional sign followed by a finite-length sequence of decimal
digits (#x30-#x39).  If the sign is omitted, &quot;+&quot; is assumed.
For example: -1, 0, 12678, +10000.
</p></div><div class="div4">
<h5><a id="short-canonical-repr" name="short-canonical-repr"/>3.3.18.2 Canonical representation</h5><p>
The canonical representation for <b>short</b> is defined
by prohibiting certain options from the
<a href="#short-lexical-representation">Lexical representation (&#xa7;3.3.18.1)</a>.  Specifically, the
the optional &quot;+&quot; sign is prohibited and leading zeroes are prohibited.
</p></div><div class="div4">
<h5><a id="short-facets" name="short-facets"/>3.3.18.3 Constraining facets</h5><p><strong>short</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-totalDigits">totalDigits</a></li><li><a href="#rf-fractionDigits">fractionDigits</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-maxInclusive">maxInclusive</a></li><li><a href="#rf-maxExclusive">maxExclusive</a></li><li><a href="#rf-minInclusive">minInclusive</a></li><li><a href="#rf-minExclusive">minExclusive</a></li></ul></div><div class="div4">
<h5><a id="short-derived-types" name="short-derived-types"/>3.3.18.4 Derived datatypes</h5><p>
			The following <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>
			datatypes are <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
			<strong>short</strong>:
		</p><ul><li><a href="#byte">byte</a></li></ul></div></div><div class="div3">
<h4><a id="byte" name="byte"/>3.3.19 byte</h4><p>
<span class="termdef"><a id="dt-byte" name="dt-byte">[Definition:]&#xa0;&#xa0;</a>
<b>byte</b>
is <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from <a href="#short">short</a>
by setting the value of <a class="termref" href="#dt-maxInclusive"><span class="arrow">&#xb7;</span>maxInclusive<span class="arrow">&#xb7;</span></a> to be 127
and <a class="termref" href="#dt-minInclusive"><span class="arrow">&#xb7;</span>minInclusive<span class="arrow">&#xb7;</span></a> to be -128.
The <a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a> of <b>byte</b> is
<a href="#short">short</a>.
</span>
</p><div class="div4">
<h5><a id="byte-lexical-representation" name="byte-lexical-representation"/>3.3.19.1 Lexical representation</h5><p>
<b>byte</b> has a lexical representation consisting
of an optional sign followed by a finite-length
sequence of decimal digits (#x30-#x39).  If the sign is omitted, &quot;+&quot; is assumed.
For example: -1, 0,
126, +100.
</p></div><div class="div4">
<h5><a id="byte-canonical-repr" name="byte-canonical-repr"/>3.3.19.2 Canonical representation</h5><p>
The canonical representation for <b>byte</b> is defined
by prohibiting certain options from the
<a href="#byte-lexical-representation">Lexical representation (&#xa7;3.3.19.1)</a>.  Specifically, the
the optional &quot;+&quot; sign is prohibited and leading zeroes are prohibited.
</p></div><div class="div4">
<h5><a id="byte-facets" name="byte-facets"/>3.3.19.3 Constraining facets</h5><p><strong>byte</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-totalDigits">totalDigits</a></li><li><a href="#rf-fractionDigits">fractionDigits</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-maxInclusive">maxInclusive</a></li><li><a href="#rf-maxExclusive">maxExclusive</a></li><li><a href="#rf-minInclusive">minInclusive</a></li><li><a href="#rf-minExclusive">minExclusive</a></li></ul></div></div><div class="div3">
<h4><a id="nonNegativeInteger" name="nonNegativeInteger"/>3.3.20 nonNegativeInteger</h4><p>
<span class="termdef"><a id="dt-nonNegativeInteger" name="dt-nonNegativeInteger">[Definition:]&#xa0;&#xa0;</a>
<b>nonNegativeInteger</b> is <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
<a href="#integer">integer</a> by setting the value of
<a class="termref" href="#dt-minInclusive"><span class="arrow">&#xb7;</span>minInclusive<span class="arrow">&#xb7;</span></a> to be 0.  This results in the
standard mathematical concept of the non-negative integers. The
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <b>nonNegativeInteger</b>
is the infinite set {0,1,2,...}.  The <a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a> of
<b>nonNegativeInteger</b> is <a href="#integer">integer</a>.
</span>
</p><div class="div4">
<h5><a id="nonNegativeInteger-lexical-representation" name="nonNegativeInteger-lexical-representation"/>3.3.20.1 Lexical representation</h5><p>
<b>nonNegativeInteger</b> has a lexical representation consisting of
an optional sign followed by a finite-length
sequence of decimal digits (#x30-#x39).  If the sign is omitted,
the positive sign (&quot;+&quot;) is assumed.
If the sign is present, it must be &quot;+&quot; except for lexical forms
denoting zero, which may be preceded by a positive (&quot;+&quot;) or a negative (&quot;-&quot;) sign.
For example:
1, 0, 12678967543233, +100000.
</p></div><div class="div4">
<h5><a id="nonNegativeInteger-canonical-repr" name="nonNegativeInteger-canonical-repr"/>3.3.20.2 Canonical representation</h5><p>
The canonical representation for <b>nonNegativeInteger</b> is defined
by prohibiting certain options from the
<a href="#nonNegativeInteger-lexical-representation">Lexical representation (&#xa7;3.3.20.1)</a>.  Specifically, the
the optional &quot;+&quot; sign is prohibited and leading zeroes are prohibited.
</p></div><div class="div4">
<h5><a id="nonNegativeInteger-facets" name="nonNegativeInteger-facets"/>3.3.20.3 Constraining facets</h5><p><strong>nonNegativeInteger</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-totalDigits">totalDigits</a></li><li><a href="#rf-fractionDigits">fractionDigits</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-maxInclusive">maxInclusive</a></li><li><a href="#rf-maxExclusive">maxExclusive</a></li><li><a href="#rf-minInclusive">minInclusive</a></li><li><a href="#rf-minExclusive">minExclusive</a></li></ul></div><div class="div4">
<h5><a id="nonNegativeInteger-derived-types" name="nonNegativeInteger-derived-types"/>3.3.20.4 Derived datatypes</h5><p>
			The following <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>
			datatypes are <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
			<strong>nonNegativeInteger</strong>:
		</p><ul><li><a href="#unsignedLong">unsignedLong</a></li><li><a href="#positiveInteger">positiveInteger</a></li></ul></div></div><div class="div3">
<h4><a id="unsignedLong" name="unsignedLong"/>3.3.21 unsignedLong</h4><p>
<span class="termdef"><a id="dt-unsignedLong" name="dt-unsignedLong">[Definition:]&#xa0;&#xa0;</a>
<b>unsignedLong</b> is <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
<a href="#nonNegativeInteger">nonNegativeInteger</a> by setting the value of
<a class="termref" href="#dt-maxInclusive"><span class="arrow">&#xb7;</span>maxInclusive<span class="arrow">&#xb7;</span></a> to be 18446744073709551615.
The <a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a> of <b>unsignedLong</b> is
<a href="#nonNegativeInteger">nonNegativeInteger</a>.
</span>
</p><div class="div4">
<h5><a id="unsignedLong-lexical-representation" name="unsignedLong-lexical-representation"/>3.3.21.1 Lexical representation</h5><p>
<b>unsignedLong</b> has a lexical representation consisting
of a finite-length sequence of decimal digits (#x30-#x39).
For example: 0,
12678967543233, 100000.
</p></div><div class="div4">
<h5><a id="unsignedLong-canonical-repr" name="unsignedLong-canonical-repr"/>3.3.21.2 Canonical representation</h5><p>
The canonical representation for <b>unsignedLong</b> is defined
by prohibiting certain options from the
<a href="#unsignedLong-lexical-representation">Lexical representation (&#xa7;3.3.21.1)</a>.  Specifically,
leading zeroes are prohibited.
</p></div><div class="div4">
<h5><a id="unsignedLong-facets" name="unsignedLong-facets"/>3.3.21.3 Constraining facets</h5><p><strong>unsignedLong</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-totalDigits">totalDigits</a></li><li><a href="#rf-fractionDigits">fractionDigits</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-maxInclusive">maxInclusive</a></li><li><a href="#rf-maxExclusive">maxExclusive</a></li><li><a href="#rf-minInclusive">minInclusive</a></li><li><a href="#rf-minExclusive">minExclusive</a></li></ul></div><div class="div4">
<h5><a id="unsignedLong-derived-types" name="unsignedLong-derived-types"/>3.3.21.4 Derived datatypes</h5><p>
			The following <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>
			datatypes are <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
			<strong>unsignedLong</strong>:
		</p><ul><li><a href="#unsignedInt">unsignedInt</a></li></ul></div></div><div class="div3">
<h4><a id="unsignedInt" name="unsignedInt"/>3.3.22 unsignedInt</h4><p>
<span class="termdef"><a id="dt-unsignedInt" name="dt-unsignedInt">[Definition:]&#xa0;&#xa0;</a>
<b>unsignedInt</b> is <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
<a href="#unsignedLong">unsignedLong</a> by setting the value of
<a class="termref" href="#dt-maxInclusive"><span class="arrow">&#xb7;</span>maxInclusive<span class="arrow">&#xb7;</span></a> to be 4294967295.  The
<a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a> of <b>unsignedInt</b> is
<a href="#unsignedLong">unsignedLong</a>.
</span>
</p><div class="div4">
<h5><a id="unsignedInt-lexical-representation" name="unsignedInt-lexical-representation"/>3.3.22.1 Lexical representation</h5><p>
<b>unsignedInt</b> has a lexical representation consisting
of a finite-length
sequence of decimal digits (#x30-#x39).  For example: 0,
1267896754, 100000.
</p></div><div class="div4">
<h5><a id="unsignedInt-canonical-repr" name="unsignedInt-canonical-repr"/>3.3.22.2 Canonical representation</h5><p>
The canonical representation for <b>unsignedInt</b> is defined
by prohibiting certain options from the
<a href="#unsignedInt-lexical-representation">Lexical representation (&#xa7;3.3.22.1)</a>.  Specifically,
leading zeroes are prohibited.
</p></div><div class="div4">
<h5><a id="unsignedInt-facets" name="unsignedInt-facets"/>3.3.22.3 Constraining facets</h5><p><strong>unsignedInt</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-totalDigits">totalDigits</a></li><li><a href="#rf-fractionDigits">fractionDigits</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-maxInclusive">maxInclusive</a></li><li><a href="#rf-maxExclusive">maxExclusive</a></li><li><a href="#rf-minInclusive">minInclusive</a></li><li><a href="#rf-minExclusive">minExclusive</a></li></ul></div><div class="div4">
<h5><a id="unsignedInt-derived-types" name="unsignedInt-derived-types"/>3.3.22.4 Derived datatypes</h5><p>
			The following <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>
			datatypes are <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
			<strong>unsignedInt</strong>:
		</p><ul><li><a href="#unsignedShort">unsignedShort</a></li></ul></div></div><div class="div3">
<h4><a id="unsignedShort" name="unsignedShort"/>3.3.23 unsignedShort</h4><p>
<span class="termdef"><a id="dt-unsignedShort" name="dt-unsignedShort">[Definition:]&#xa0;&#xa0;</a>
<b>unsignedShort</b> is <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
<a href="#unsignedInt">unsignedInt</a> by setting the value of
<a class="termref" href="#dt-maxInclusive"><span class="arrow">&#xb7;</span>maxInclusive<span class="arrow">&#xb7;</span></a> to be 65535.  The
<a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a> of <b>unsignedShort</b> is
<a href="#unsignedInt">unsignedInt</a>.
</span>
</p><div class="div4">
<h5><a id="unsignedShort-lexical-representation" name="unsignedShort-lexical-representation"/>3.3.23.1 Lexical representation</h5><p>
<b>unsignedShort</b>  has a lexical representation consisting
of a finite-length
sequence of decimal digits (#x30-#x39).
For example: 0,
12678, 10000.
</p></div><div class="div4">
<h5><a id="unsignedShort-canonical-repr" name="unsignedShort-canonical-repr"/>3.3.23.2 Canonical representation</h5><p>
The canonical representation for <b>unsignedShort</b> is defined
by prohibiting certain options from the
<a href="#unsignedShort-lexical-representation">Lexical representation (&#xa7;3.3.23.1)</a>.  Specifically, the
leading zeroes are prohibited.
</p></div><div class="div4">
<h5><a id="unsingedShort-facets" name="unsingedShort-facets"/>3.3.23.3 Constraining facets</h5><p><strong>unsignedShort</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-totalDigits">totalDigits</a></li><li><a href="#rf-fractionDigits">fractionDigits</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-maxInclusive">maxInclusive</a></li><li><a href="#rf-maxExclusive">maxExclusive</a></li><li><a href="#rf-minInclusive">minInclusive</a></li><li><a href="#rf-minExclusive">minExclusive</a></li></ul></div><div class="div4">
<h5><a id="unsignedShort-derived-types" name="unsignedShort-derived-types"/>3.3.23.4 Derived datatypes</h5><p>
			The following <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>
			datatypes are <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
			<strong>unsignedShort</strong>:
		</p><ul><li><a href="#unsignedByte">unsignedByte</a></li></ul></div></div><div class="div3">
<h4><a id="unsignedByte" name="unsignedByte"/>3.3.24 unsignedByte</h4><p>
<span class="termdef"><a id="dt-unsignedByte" name="dt-unsignedByte">[Definition:]&#xa0;&#xa0;</a>
<b>unsignedByte</b> is <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
<a href="#unsignedShort">unsignedShort</a> by setting the value of
<a class="termref" href="#dt-maxInclusive"><span class="arrow">&#xb7;</span>maxInclusive<span class="arrow">&#xb7;</span></a> to be 255. The
<a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a> of <b>unsignedByte</b> is
<a href="#unsignedShort">unsignedShort</a>.
</span>
</p><div class="div4">
<h5><a id="unsignedByte-lexical-representation" name="unsignedByte-lexical-representation"/>3.3.24.1 Lexical representation</h5><p>
<b>unsignedByte</b>  has a lexical representation consisting
of a finite-length
sequence of decimal digits (#x30-#x39).
For example: 0,
126, 100.
</p></div><div class="div4">
<h5><a id="unsignedByte-canonical-repr" name="unsignedByte-canonical-repr"/>3.3.24.2 Canonical representation</h5><p>
The canonical representation for <b>unsignedByte</b> is defined
by prohibiting certain options from the
<a href="#unsignedByte-lexical-representation">Lexical representation (&#xa7;3.3.24.1)</a>.  Specifically,
leading zeroes are prohibited.
</p></div><div class="div4">
<h5><a id="unisngedByte-facets" name="unisngedByte-facets"/>3.3.24.3 Constraining facets</h5><p><strong>unsignedByte</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-totalDigits">totalDigits</a></li><li><a href="#rf-fractionDigits">fractionDigits</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-maxInclusive">maxInclusive</a></li><li><a href="#rf-maxExclusive">maxExclusive</a></li><li><a href="#rf-minInclusive">minInclusive</a></li><li><a href="#rf-minExclusive">minExclusive</a></li></ul></div></div><div class="div3">
<h4><a id="positiveInteger" name="positiveInteger"/>3.3.25 positiveInteger</h4><p>
<span class="termdef"><a id="dt-positiveInteger" name="dt-positiveInteger">[Definition:]&#xa0;&#xa0;</a>
<b>positiveInteger</b> is <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from
<a href="#nonNegativeInteger">nonNegativeInteger</a> by setting the value of
<a class="termref" href="#dt-minInclusive"><span class="arrow">&#xb7;</span>minInclusive<span class="arrow">&#xb7;</span></a> to be 1. This results in the standard
mathematical concept of the positive integer numbers.
The <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <b>positiveInteger</b>
is the infinite set {1,2,...}.  The <a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a> of
<b>positiveInteger</b> is <a href="#nonNegativeInteger">nonNegativeInteger</a>.
</span>
</p><div class="div4">
<h5><a id="positiveInteger-lexical-representation" name="positiveInteger-lexical-representation"/>3.3.25.1 Lexical representation</h5><p>
<b>positiveInteger</b> has a lexical representation consisting
of an optional positive sign (&quot;+&quot;) followed by a finite-length
sequence of decimal digits (#x30-#x39).
For example: 1, 12678967543233, +100000.
</p></div><div class="div4">
<h5><a id="positiveInteger-canonical-repr" name="positiveInteger-canonical-repr"/>3.3.25.2 Canonical representation</h5><p>
The canonical representation for <b>positiveInteger</b> is defined
by prohibiting certain options from the
<a href="#positiveInteger-lexical-representation">Lexical representation (&#xa7;3.3.25.1)</a>.  Specifically, the
optional &quot;+&quot; sign is prohibited and leading zeroes are prohibited.
</p></div><div class="div4">
<h5><a id="positiveInteger-facets" name="positiveInteger-facets"/>3.3.25.3 Constraining facets</h5><p><strong>positiveInteger</strong> has the
					following <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facets<span class="arrow">&#xb7;</span></a>:
				</p><ul><li><a href="#rf-totalDigits">totalDigits</a></li><li><a href="#rf-fractionDigits">fractionDigits</a></li><li><a href="#rf-pattern">pattern</a></li><li><a href="#rf-whiteSpace">whiteSpace</a></li><li><a href="#rf-enumeration">enumeration</a></li><li><a href="#rf-maxInclusive">maxInclusive</a></li><li><a href="#rf-maxExclusive">maxExclusive</a></li><li><a href="#rf-minInclusive">minInclusive</a></li><li><a href="#rf-minExclusive">minExclusive</a></li></ul></div></div></div></div><div class="div1">
<h2><a id="datatype-components" name="datatype-components"/>4 Datatype components</h2><p>
The following sections provide full details on the properties and
significance of each kind of schema component involved in datatype
definitions. For each property, the kinds of values it is allowed to have is
specified.  Any property not identified as optional is required to
be present; optional properties which are not present have
<a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-null">absent</a> as their value.
Any property identified as a having a set, subset or <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a>
value may have an empty value unless this is explicitly ruled out: this is
not the same as <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-null">absent</a>.
Any property value identified as a superset or a subset of some set may
be equal to that set, unless a proper superset or subset is explicitly
called for.
</p><p>
For more information on the notion of datatype (schema) components,
see <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#components">Schema Component Details</a>
of <a href="#structural-schemas">[XML Schema Part 1: Structures]</a>.
</p><div class="div2">
<h3 class="withToc"><span class="nav"> <a class="nav" href="#rf-fund-facets"><img src="next.jpg" alt="next sub-section"/></a></span><a id="rf-defn" name="rf-defn"/>4.1 Simple Type Definition</h3><div class="localToc">&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;4.1.1 <a href="#dc-defn">The Simple Type Definition Schema Component</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;4.1.2 <a href="#xr-defn">XML Representation of Simple Type Definition Schema Components</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;4.1.3 <a href="#defn-rep-constr">Constraints on XML Representation of Simple Type Definition</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;4.1.4 <a href="#defn-validation-rules">Simple Type Definition Validation Rules</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;4.1.5 <a href="#defn-coss">Constraints on Simple Type Definition Schema Components</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;4.1.6 <a href="#anySimpleType-component">Simple Type Definition for anySimpleType</a><br/>
</div><p>
Simple Type definitions provide for:
</p><ul><li>
Establishing the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> and <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a>
of a datatype, through
the combined set of <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facet<span class="arrow">&#xb7;</span></a>s specified
in the definition;
</li><li>
Attaching a unique name (actually a <a href="#QName">QName</a>) to the
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> and <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a>.
</li></ul><div class="div3">
<h4><a id="dc-defn" name="dc-defn"/>4.1.1 The Simple Type Definition Schema Component</h4><p>
The Simple Type Definition schema component has the following properties:
</p><div class="schemaComp"><div class="compHeader"><span class="schemaComp">Schema&#xa0;Component</span>:&#xa0;<a href="#datatype">Simple Type Definition</a></div><div class="compBody">
<dl class="props">
<dt><a name="defn-name" id="defn-name"><span class="propdef">{name}</span></a></dt><dd>
Optional.  An NCName as defined by
<a href="#XMLNS">[Namespaces in XML]</a>.
</dd>
<dt><a name="defn-target-namespace" id="defn-target-namespace"><span class="propdef">{target namespace}</span></a></dt><dd>
Either <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-null">absent</a> or a
namespace name, as defined in <a href="#XMLNS">[Namespaces in XML]</a>.
</dd>
<dt><a name="defn-variety" id="defn-variety"><span class="propdef">{variety}</span></a></dt><dd>
One of {<i>atomic</i>, <i>list</i>, <i>union</i>}. Depending on the
value of <a class="propref" href="#defn-variety">{variety}</a>, further properties are defined as follows:
<dl><dt class="label">atomic</dt><dd><dl class="props">
<dt><a name="defn-primitive" id="defn-primitive"><span class="propdef">{primitive type definition}</span></a></dt><dd>
A <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>&#xa0;<a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a>
datatype definition).
</dd>
</dl></dd><dt class="label">list</dt><dd><dl class="props">
<dt><a name="defn-itemType" id="defn-itemType"><span class="propdef">{item type definition}</span></a></dt><dd>
An <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a> or <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a> simple type definition.
</dd>
</dl></dd><dt class="label">union</dt><dd><dl class="props">
<dt><a name="defn-memberTypes" id="defn-memberTypes"><span class="propdef">{member type definitions}</span></a></dt><dd>
A non-empty sequence of simple type definitions.
</dd>
</dl></dd></dl>
</dd>
<dt><a name="defn-facets" id="defn-facets"><span class="propdef">{facets}</span></a></dt><dd>
A possibly empty set of <a href="#facets">Facets (&#xa7;2.4)</a>.
</dd>
<dt><a name="defn-fund-facets" id="defn-fund-facets"><span class="propdef">{fundamental facets}</span></a></dt><dd>
A set of <a href="#fundamental-facets">Fundamental facets (&#xa7;2.4.1)</a>
</dd>
<dt><a name="defn-basetype" id="defn-basetype"><span class="propdef">{base type definition}</span></a></dt><dd>
If the datatype has been <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> by
<a class="termref" href="#dt-restriction"><span class="arrow">&#xb7;</span>restriction<span class="arrow">&#xb7;</span></a> then the <a href="#dc-defn">Simple Type Definition</a> component
from which it is <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>, otherwise
the <a href="#anySimpleType-component">Simple Type Definition for anySimpleType (&#xa7;4.1.6)</a>.
</dd>
<dt><a name="defn-final" id="defn-final"><span class="propdef">{final}</span></a></dt><dd>
A  subset of <em>{restriction, list, union}</em>.
</dd>
<dt><a name="defn-annotation" id="defn-annotation"><span class="propdef">{annotation}</span></a></dt><dd>
Optional.  An <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#Annotation">annotation</a>.
</dd>
</dl>
</div></div><p>
Datatypes are identified by their <a class="propref" href="#defn-name">{name}</a>
and <a class="propref" href="#defn-target-namespace">{target namespace}</a>.  Except
for anonymous datatypes (those with no <a class="propref" href="#defn-name">{name}</a>),
datatype definitions <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be uniquely identified
within a schema.
</p><p>
If <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a>
then the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of the datatype defined will
be a subset of the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of
<a class="propref" href="#defn-basetype">{base type definition}</a> (which is a subset of the
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <a class="propref" href="#defn-primitive">{primitive type definition}</a>).
If <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a>
then the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of the datatype defined will
be the set of finite-length sequence of values from the
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <a class="propref" href="#defn-itemType">{item type definition}</a>.
If <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a> then the
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of the datatype defined will be the
union of the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>s of each datatype in
<a class="propref" href="#defn-memberTypes">{member type definitions}</a>.
</p><p>
If <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a>
then the <a class="propref" href="#defn-variety">{variety}</a> of <a class="propref" href="#defn-basetype">{base type definition}</a>
must be <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a>.
If <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a>
then the <a class="propref" href="#defn-variety">{variety}</a> of <a class="propref" href="#defn-itemType">{item type definition}</a>
must be either <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a> or <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a>.
If <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a>
then
<a class="propref" href="#defn-memberTypes">{member type definitions}</a> must be a list of datatype definitions.
</p><p>
The value of <a class="propref" href="#defn-facets">{facets}</a> consists of the set of
<a class="termref" href="#dt-facet"><span class="arrow">&#xb7;</span>facet<span class="arrow">&#xb7;</span></a>s specified directly in the datatype definition
unioned with the possibly empty set of <a class="propref" href="#defn-facets">{facets}</a> of
<a class="propref" href="#defn-basetype">{base type definition}</a>.
</p><p>
The value of <a class="propref" href="#defn-fund-facets">{fundamental facets}</a> consists of the set of
<a class="termref" href="#dt-fundamental-facet"><span class="arrow">&#xb7;</span>fundamental facet<span class="arrow">&#xb7;</span></a>s and their values.
</p><p>
If <a class="propref" href="#defn-final">{final}</a> is the empty set then the type can be used
in deriving other types; the explicit values <em>restriction</em>,
<em>list</em> and <em>union</em> prevent further derivations
by <a class="termref" href="#dt-restriction"><span class="arrow">&#xb7;</span>restriction<span class="arrow">&#xb7;</span></a>, <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> and
<a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a> respectively.
</p></div><div class="div3">
<h4><a id="xr-defn" name="xr-defn"/>4.1.2 XML Representation of Simple Type Definition Schema Components</h4><p>
The XML representation for a <a href="#dc-defn">Simple Type Definition</a> schema component
is a <a class="eltref" href="#element-simpleType">&lt;simpleType&gt;</a> element information item. The
correspondences between the properties of the information item and
properties of the component are as follows:
</p><div class="reprdef"><div class="reprHeader"><span class="reprdef">XML&#xa0;Representation&#xa0;Summary</span>:&#xa0;<code>simpleType</code>&#xa0;Element Information Item</div><div class="reprBody">
 <p class="element-syntax-1"><a name="element-simpleType" id="element-simpleType">&lt;simpleType</a><br/>&#xa0;&#xa0;final = 
 
   (<var>#all</var> | List of (<var>list</var> | <var>union</var> | <var>restriction</var>))
 <br/>&#xa0;&#xa0;id = <a href="#ID">ID</a><br/>&#xa0;&#xa0;<b>name</b> = <a href="#NCName">NCName</a><br/>&#xa0;&#xa0;<em>{any attributes with non-schema namespace . . .}</em>&gt;<br/><em>&#xa0;&#xa0;Content: </em>(<a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">annotation</a>?, (<a class="eltref" href="#element-restriction">restriction</a> | <a class="eltref" href="#element-list">list</a> | <a class="eltref" href="#element-union">union</a>))<br/>&lt;/simpleType&gt;</p>
<div class="reprcomp"><table class="reprcomp"><thead><tr><th><a href="#dc-defn">Datatype Definition</a><strong>&#xa0;Schema Component</strong></th></tr></thead><tbody><tr><td><table cellpadding="3" border="0"><thead><tr><th align="left">Property</th><th align="left">Representation</th></tr></thead><tbody valign="top"><tr valign="top"><td><a class="propref" href="#defn-name">{name}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the <code>name</code>&#xa0;<a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>, if present,
otherwise <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-null">null</a>
</td></tr><tr valign="top"><td><a class="propref" href="#defn-final">{final}</a></td><td>
A set corresponding to the <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the
<code>final</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>, if present, otherwise
 the <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the
<code>finalDefault</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a> of the ancestor
<a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-schema">schema</a>
element information item, if present, otherwise the empty string, as follows:
   <dl><dt class="label">the empty string</dt><dd>the empty set;</dd><dt class="label">
      <code>#all</code>
     </dt><dd><em>{restriction, list, union}</em>;</dd><dt class="label"><em>otherwise</em></dt><dd>a set with members drawn from the set above, each being present or
absent depending on whether the string contains an equivalently named
space-delimited substring.<div class="note"><b>Note:&#xa0;</b>Although the <code>finalDefault</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a> of
       <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-schema">schema</a> may include
       values other than
       <i>restriction</i>, <i>list</i> or <i>union</i>, those values
       are ignored in the determination of <a class="propref" href="#defn-final">{final}</a>
       </div></dd></dl>
</td></tr><tr valign="top"><td><a class="propref" href="#defn-target-namespace">{target namespace}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the <code>targetNamespace</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>
of the parent <code>schema</code> element information item.
</td></tr><tr valign="top"><td><a class="propref" href="#defn-annotation">{annotation}</a></td><td>
The annotation corresponding to the <a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">&lt;annotation&gt;</a>
element information item in the <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.element">[children]</a>, if present, otherwise
<a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-null">null</a>
</td></tr></tbody></table></td></tr></tbody></table></div>
</div></div><p>
A <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> datatype can be <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>
from a <a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a> datatype or another
<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> datatype by one of three means:
by <em>restriction</em>, by <em>list</em> or by <em>union</em>.
</p><div class="div4">
<h5><a id="derivation-by-restriction" name="derivation-by-restriction"/>4.1.2.1 Derivation by restriction</h5><div class="reprdef"><div class="reprHeader"><span class="reprdef">XML&#xa0;Representation&#xa0;Summary</span>:&#xa0;<code>restriction</code>&#xa0;Element Information Item</div><div class="reprBody">
<p class="element-syntax-1"><a name="element-restriction" id="element-restriction">&lt;restriction</a><br/>&#xa0;&#xa0;base = <a href="#QName">QName</a><br/>&#xa0;&#xa0;id = <a href="#ID">ID</a><br/>&#xa0;&#xa0;<em>{any attributes with non-schema namespace . . .}</em>&gt;<br/><em>&#xa0;&#xa0;Content: </em>(<a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">annotation</a>?, (<a class="eltref" href="#element-simpleType">simpleType</a>?, (<a class="eltref" href="#element-minExclusive">minExclusive</a> | <a class="eltref" href="#element-minInclusive">minInclusive</a> | <a class="eltref" href="#element-maxExclusive">maxExclusive</a> | <a class="eltref" href="#element-maxInclusive">maxInclusive</a> | <a class="eltref" href="#element-totalDigits">totalDigits</a> | <a class="eltref" href="#element-fractionDigits">fractionDigits</a> | <a class="eltref" href="#element-length">length</a> | <a class="eltref" href="#element-minLength">minLength</a> | <a class="eltref" href="#element-maxLength">maxLength</a> | <a class="eltref" href="#element-enumeration">enumeration</a> | <a class="eltref" href="#element-whiteSpace">whiteSpace</a> | <a class="eltref" href="#element-pattern">pattern</a>)*))<br/>&lt;/restriction&gt;</p>
<div class="reprcomp"><table class="reprcomp"><thead><tr><th><a href="#dc-defn">Simple Type Definition</a><strong>&#xa0;Schema Component</strong></th></tr></thead><tbody><tr><td><table cellpadding="3" border="0"><thead><tr><th align="left">Property</th><th align="left">Representation</th></tr></thead><tbody valign="top"><tr valign="top"><td><a class="propref" href="#defn-variety">{variety}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of <a class="propref" href="#defn-variety">{variety}</a> of <a class="propref" href="#defn-basetype">{base type definition}</a>
</td></tr><tr valign="top"><td><a class="propref" href="#defn-facets">{facets}</a></td><td>
The union of the set of <a href="#facets">Facets (&#xa7;2.4)</a> components
resolved to by the facet <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.element">[children]</a> merged with <a class="propref" href="#defn-facets">{facets}</a>
from <a class="propref" href="#defn-basetype">{base type definition}</a>, subject to the Facet Restriction Valid
constraints specified in <a href="#facets">Facets (&#xa7;2.4)</a>.
</td></tr><tr valign="top"><td><a class="propref" href="#defn-basetype">{base type definition}</a></td><td>
The <a href="#dc-defn">Simple Type Definition</a> component resolved to by the <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the
<code>base</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a> or the <a class="eltref" href="#element-simpleType">&lt;simpleType&gt;</a> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.element">[children]</a>,
whichever is present.
</td></tr></tbody></table></td></tr></tbody></table></div>
</div></div><div class="exampleOuter"><div class="exampleHeader">Example</div><div class="exampleWrapper">
An electronic commerce schema might define a datatype called
<em>Sku</em> (the barcode number that appears on products) from the
<a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a> datatype <a href="#string">string</a> by
supplying a value for the <a class="termref" href="#dt-pattern"><span class="arrow">&#xb7;</span>pattern<span class="arrow">&#xb7;</span></a> facet.
</div><div class="exampleInner"><pre>&lt;simpleType name='Sku'&gt;
    &lt;restriction base='string'&gt;
      &lt;pattern value='\d{3}-[A-Z]{2}'/&gt;
    &lt;/restriction&gt;
&lt;/simpleType&gt;</pre></div><div class="exampleWrapper">
In this case, <em>Sku</em> is the name of the new
<a class="termref" href="#dt-user-derived"><span class="arrow">&#xb7;</span>user-derived<span class="arrow">&#xb7;</span></a> datatype, <a href="#string">string</a> is
its <a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a> and <a class="termref" href="#dt-pattern"><span class="arrow">&#xb7;</span>pattern<span class="arrow">&#xb7;</span></a>
is the facet.
</div></div></div><div class="div4">
<h5><a id="derivation-by-list" name="derivation-by-list"/>4.1.2.2 Derivation by list</h5><div class="reprdef"><div class="reprHeader"><span class="reprdef">XML&#xa0;Representation&#xa0;Summary</span>:&#xa0;<code>list</code>&#xa0;Element Information Item</div><div class="reprBody">
 <p class="element-syntax-1"><a name="element-list" id="element-list">&lt;list</a><br/>&#xa0;&#xa0;id = <a href="#ID">ID</a><br/>&#xa0;&#xa0;itemType = <a href="#QName">QName</a><br/>&#xa0;&#xa0;<em>{any attributes with non-schema namespace . . .}</em>&gt;<br/><em>&#xa0;&#xa0;Content: </em>(<a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">annotation</a>?, <a class="eltref" href="#element-simpleType">simpleType</a>?)<br/>&lt;/list&gt;</p>
<div class="reprcomp"><table class="reprcomp"><thead><tr><th><a href="#dc-defn">Simple Type Definition</a><strong>&#xa0;Schema Component</strong></th></tr></thead><tbody><tr><td><table cellpadding="3" border="0"><thead><tr><th align="left">Property</th><th align="left">Representation</th></tr></thead><tbody valign="top"><tr valign="top"><td><a class="propref" href="#defn-variety">{variety}</a></td><td>
list
</td></tr><tr valign="top"><td><a class="propref" href="#defn-itemType">{item type definition}</a></td><td>
The <a href="#dc-defn">Simple Type Definition</a> component resolved to by the <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the
<code>itemType</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>
or the <a class="eltref" href="#element-simpleType">&lt;simpleType&gt;</a> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.element">[children]</a>,
whichever is present.
</td></tr></tbody></table></td></tr></tbody></table></div>
</div></div><p>
A <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> datatype must be <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>
from an <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a> or a <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a> datatype,
known as the
<a class="termref" href="#dt-itemType"><span class="arrow">&#xb7;</span>itemType<span class="arrow">&#xb7;</span></a> of the <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> datatype.
This yields a datatype whose <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> is composed of
finite-length sequences of values from the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of the
<a class="termref" href="#dt-itemType"><span class="arrow">&#xb7;</span>itemType<span class="arrow">&#xb7;</span></a> and whose <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> is
composed of space-separated lists of literals of the
<a class="termref" href="#dt-itemType"><span class="arrow">&#xb7;</span>itemType<span class="arrow">&#xb7;</span></a>.
</p><div class="exampleOuter"><div class="exampleHeader">Example</div><div class="exampleWrapper">
A system might want to store lists of floating point values.
</div><div class="exampleInner"><pre>&lt;simpleType name='listOfFloat'&gt;
  &lt;list itemType='float'/&gt;
&lt;/simpleType&gt;
</pre></div><div class="exampleWrapper">
In this case, <em>listOfFloat</em> is the name of the new
<a class="termref" href="#dt-user-derived"><span class="arrow">&#xb7;</span>user-derived<span class="arrow">&#xb7;</span></a> datatype, <a href="#float">float</a> is its
<a class="termref" href="#dt-itemType"><span class="arrow">&#xb7;</span>itemType<span class="arrow">&#xb7;</span></a> and <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> is the
derivation method.
</div></div><p>
As mentioned in <a href="#list-datatypes">List datatypes (&#xa7;2.5.1.2)</a>,
when a datatype is <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from a
<a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> datatype, the following
<a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facet<span class="arrow">&#xb7;</span></a>s can be used:
</p><ul><li><a class="termref" href="#dt-length"><span class="arrow">&#xb7;</span>length<span class="arrow">&#xb7;</span></a></li><li><a class="termref" href="#dt-maxLength"><span class="arrow">&#xb7;</span>maxLength<span class="arrow">&#xb7;</span></a></li><li><a class="termref" href="#dt-minLength"><span class="arrow">&#xb7;</span>minLength<span class="arrow">&#xb7;</span></a></li><li><a class="termref" href="#dt-enumeration"><span class="arrow">&#xb7;</span>enumeration<span class="arrow">&#xb7;</span></a></li><li><a class="termref" href="#dt-pattern"><span class="arrow">&#xb7;</span>pattern<span class="arrow">&#xb7;</span></a></li><li><a class="termref" href="#dt-whiteSpace"><span class="arrow">&#xb7;</span>whiteSpace<span class="arrow">&#xb7;</span></a></li></ul><p>
regardless of the <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facet<span class="arrow">&#xb7;</span></a>s that are applicable
to the <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a> datatype that serves as the
<a class="termref" href="#dt-itemType"><span class="arrow">&#xb7;</span>itemType<span class="arrow">&#xb7;</span></a> of the <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a>.
</p><p>
For each of <a class="termref" href="#dt-length"><span class="arrow">&#xb7;</span>length<span class="arrow">&#xb7;</span></a>, <a class="termref" href="#dt-maxLength"><span class="arrow">&#xb7;</span>maxLength<span class="arrow">&#xb7;</span></a>
and <a class="termref" href="#dt-minLength"><span class="arrow">&#xb7;</span>minLength<span class="arrow">&#xb7;</span></a>, the
<em>unit of length</em> is measured in number of list items.
The value of <a class="termref" href="#dt-whiteSpace"><span class="arrow">&#xb7;</span>whiteSpace<span class="arrow">&#xb7;</span></a>
is fixed to the value <em>collapse</em>.</p></div><div class="div4">
<h5><a id="derivation-by-union" name="derivation-by-union"/>4.1.2.3 Derivation by union</h5><div class="reprdef"><div class="reprHeader"><span class="reprdef">XML&#xa0;Representation&#xa0;Summary</span>:&#xa0;<code>union</code>&#xa0;Element Information Item</div><div class="reprBody">
 <p class="element-syntax-1"><a name="element-union" id="element-union">&lt;union</a><br/>&#xa0;&#xa0;id = <a href="#ID">ID</a><br/>&#xa0;&#xa0;memberTypes = List of <a href="#QName">QName</a><br/>&#xa0;&#xa0;<em>{any attributes with non-schema namespace . . .}</em>&gt;<br/><em>&#xa0;&#xa0;Content: </em>(<a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">annotation</a>?, <a class="eltref" href="#element-simpleType">simpleType</a>*)<br/>&lt;/union&gt;</p>
<div class="reprcomp"><table class="reprcomp"><thead><tr><th><a href="#dc-defn">Simple Type Definition</a><strong>&#xa0;Schema Component</strong></th></tr></thead><tbody><tr><td><table cellpadding="3" border="0"><thead><tr><th align="left">Property</th><th align="left">Representation</th></tr></thead><tbody valign="top"><tr valign="top"><td><a class="propref" href="#defn-variety">{variety}</a></td><td>
union
</td></tr><tr valign="top"><td><a class="propref" href="#defn-memberTypes">{member type definitions}</a></td><td>
The sequence of <a href="#dc-defn">Simple Type Definition</a> components resolved to by the
items in the <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the
<code>memberTypes</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>, if any,
in order, followed by the <a href="#dc-defn">Simple Type Definition</a> components resolved to by the
<a class="eltref" href="#element-simpleType">&lt;simpleType&gt;</a> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.element">[children]</a>, if any, in order.
If <a class="propref" href="#defn-variety">{variety}</a> is <em>union</em> for
any <a href="#dc-defn">Simple Type Definition</a> components resolved to above, then
the <a href="#dc-defn">Simple Type Definition</a> is replaced by its
<a class="propref" href="#defn-memberTypes">{member type definitions}</a>.
</td></tr></tbody></table></td></tr></tbody></table></div>
</div></div><p>
A <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a> datatype can be <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>
from one or more <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a>, <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> or
other <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a> datatypes, known as the <a class="termref" href="#dt-memberTypes"><span class="arrow">&#xb7;</span>memberTypes<span class="arrow">&#xb7;</span></a>
of that <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a> datatype.
</p><div class="exampleOuter"><div class="exampleHeader">Example</div><div class="exampleWrapper">
As an example, taken from a typical display oriented text markup language,
one might want to express font sizes as an integer between 8 and 72, or with
one of the tokens &quot;small&quot;, &quot;medium&quot; or &quot;large&quot;.  The <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a>
type definition below would accomplish that.
</div><div class="exampleInner"><pre>
&lt;xsd:attribute name=&quot;size&quot;&gt;
  &lt;xsd:simpleType&gt;
    &lt;xsd:union&gt;
      &lt;xsd:simpleType&gt;
        &lt;xsd:restriction base=&quot;xsd:positiveInteger&quot;&gt;
          &lt;xsd:minInclusive value=&quot;8&quot;/&gt;
          &lt;xsd:maxInclusive value=&quot;72&quot;/&gt;
        &lt;/xsd:restriction&gt;
      &lt;/xsd:simpleType&gt;
      &lt;xsd:simpleType&gt;
        &lt;xsd:restriction base=&quot;xsd:NMTOKEN&quot;&gt;
          &lt;xsd:enumeration value=&quot;small&quot;/&gt;
          &lt;xsd:enumeration value=&quot;medium&quot;/&gt;
          &lt;xsd:enumeration value=&quot;large&quot;/&gt;
        &lt;/xsd:restriction&gt;
      &lt;/xsd:simpleType&gt;
    &lt;/xsd:union&gt;
  &lt;/xsd:simpleType&gt;
&lt;/xsd:attribute&gt;
</pre><pre>
&lt;p&gt;
&lt;font size='large'&gt;A header&lt;/font&gt;
&lt;/p&gt;
&lt;p&gt;
&lt;font size='12'&gt;this is a test&lt;/font&gt;
&lt;/p&gt;
</pre></div></div><p>
As mentioned in <a href="#union-datatypes">Union datatypes (&#xa7;2.5.1.3)</a>,
when a datatype is <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from a
<a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a> datatype, the only following
<a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facet<span class="arrow">&#xb7;</span></a>s can be used:
</p><ul><li><a class="termref" href="#dt-pattern"><span class="arrow">&#xb7;</span>pattern<span class="arrow">&#xb7;</span></a></li><li><a class="termref" href="#dt-enumeration"><span class="arrow">&#xb7;</span>enumeration<span class="arrow">&#xb7;</span></a></li></ul><p>
regardless of the <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facet<span class="arrow">&#xb7;</span></a>s that are
applicable to the datatypes that participate in the <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a>
</p></div></div><div class="div3">
<h4><a id="defn-rep-constr" name="defn-rep-constr"/>4.1.3 Constraints on XML Representation of Simple Type Definition</h4><div class="constraintnote"><a name="src-single-facet-value" id="src-single-facet-value"/><b>Schema Representation Constraint:  Single Facet Value</b><br/><div class="constraint">
Unless otherwise specifically allowed by this specification
(<a href="#src-multiple-patterns">Multiple patterns (&#xa7;4.3.4.3)</a> and
<a href="#src-multiple-enumerations">Multiple enumerations (&#xa7;4.3.5.3)</a>) any given
<a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facet<span class="arrow">&#xb7;</span></a> can only be specifed once within
a single derivation step.
</div></div><div class="constraintnote"><a name="src-list-itemType-or-simpleType" id="src-list-itemType-or-simpleType"/><b>Schema Representation Constraint:  itemType attribute or simpleType child</b><br/><div class="constraint">
Either the <code>itemType</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a> or the
<a class="eltref" href="#element-simpleType">&lt;simpleType&gt;</a> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.element">[child]</a> of the <a class="eltref" href="#element-list">&lt;list&gt;</a> element
must be present, but not both.
</div></div><div class="constraintnote"><a name="src-restriction-base-or-simpleType" id="src-restriction-base-or-simpleType"/><b>Schema Representation Constraint:  base attribute or simpleType child</b><br/><div class="constraint">
Either the <code>base</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a> or the
<code>simpleType</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.element">[child]</a> of the <a class="eltref" href="#element-restriction">&lt;restriction&gt;</a>
element must be present, but not both.
</div></div><div class="constraintnote"><a name="src-union-memberTypes-or-simpleTypes" id="src-union-memberTypes-or-simpleTypes"/><b>Schema Representation Constraint:  memberTypes attribute or simpleType children</b><br/><div class="constraint">
Either the <code>memberTypes</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a> of the <a class="eltref" href="#element-union">&lt;union&gt;</a>
element must be non-empty or
there must be at least one <code>simpleType</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.element">[child]</a>.
</div></div></div><div class="div3">
<h4><a id="defn-validation-rules" name="defn-validation-rules"/>4.1.4 Simple Type Definition Validation Rules</h4><div class="constraintnote"><a name="cvc-facet-valid" id="cvc-facet-valid"/><b>Validation Rule:  Facet Valid</b><br/><div class="constraint">
A value in a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> is facet-valid with
respect to a <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facet<span class="arrow">&#xb7;</span></a> component if:
<div class="constraintlist"><div class="clnumber">1 
the value is facet-valid with respect to the particular
<a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facet<span class="arrow">&#xb7;</span></a> as specified below.
</div></div></div></div><div class="constraintnote"><a name="cvc-datatype-valid" id="cvc-datatype-valid"/><b>Validation Rule:  Datatype Valid</b><br/><div class="constraint">
A string is datatype-valid with respect to a datatype definition if:
<div class="constraintlist"><div class="clnumber">1 
		it <a class="termref" href="#dt-match"><span class="arrow">&#xb7;</span>match<span class="arrow">&#xb7;</span></a>es a literal in the
		<a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of the datatype, determined as follows:
		<div class="constraintlist"><div class="clnumber">1.1 
				if <a class="termref" href="#dt-pattern"><span class="arrow">&#xb7;</span>pattern<span class="arrow">&#xb7;</span></a> is a member of <a class="propref" href="#defn-facets">{facets}</a>,
				then the string must be <a href="#cvc-pattern-valid">pattern valid (&#xa7;4.3.4.4)</a>;
				</div><div class="clnumber">1.2 
				if <a class="termref" href="#dt-pattern"><span class="arrow">&#xb7;</span>pattern<span class="arrow">&#xb7;</span></a> is not a member of <a class="propref" href="#defn-facets">{facets}</a>,
				then
				<div class="constraintlist"><div class="clnumber">1.2.1 
						if <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a> then
						the string must <a class="termref" href="#dt-match"><span class="arrow">&#xb7;</span>match<span class="arrow">&#xb7;</span></a> a literal in the
						<a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of <a class="propref" href="#defn-basetype">{base type definition}</a>
						</div><div class="clnumber">1.2.2 
						if <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> then the string must
be a sequence of space-separated tokens, each of which <a class="termref" href="#dt-match"><span class="arrow">&#xb7;</span>match<span class="arrow">&#xb7;</span></a>es a literal in the <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a>
of <a class="propref" href="#defn-itemType">{item type definition}</a>
						</div><div class="clnumber">1.2.3 
						if <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a> then
						the string must <a class="termref" href="#dt-match"><span class="arrow">&#xb7;</span>match<span class="arrow">&#xb7;</span></a> a literal in the
						<a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> of at least one member of
						<a class="propref" href="#defn-memberTypes">{member type definitions}</a>
						</div></div></div></div></div><div class="clnumber">2 
		the value denoted by the literal <a class="termref" href="#dt-match"><span class="arrow">&#xb7;</span>match<span class="arrow">&#xb7;</span></a>ed in the previous step
		is a member of the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of the datatype, as determined
		by it being <a href="#cvc-facet-valid">Facet Valid (&#xa7;4.1.4)</a>
		with respect to each member of <a class="propref" href="#defn-facets">{facets}</a> (except
		for <a class="termref" href="#dt-pattern"><span class="arrow">&#xb7;</span>pattern<span class="arrow">&#xb7;</span></a>).
		</div></div></div></div></div><div class="div3">
<h4><a id="defn-coss" name="defn-coss"/>4.1.5 Constraints on Simple Type Definition Schema Components</h4><div class="constraintnote"><a name="cos-applicable-facets" id="cos-applicable-facets"/><b>Schema Component Constraint:  applicable facets</b><br/><div class="constraint">
The <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facet<span class="arrow">&#xb7;</span></a>s which are allowed
to be members of <a class="propref" href="#defn-facets">{facets}</a> are dependent on
<a class="propref" href="#defn-basetype">{base type definition}</a> as specified in the following table:
<table bgcolor="#bedce6" border="1"><tr><th><a href="#defn-basetype">{base type definition}</a></th><th>applicable <a href="#defn-facets">{facets}</a></th></tr><tr><th align="center" colspan="2">
				If <a href="#defn-variety">{variety}</a> is <a href="#dt-list">list</a>,
				then
			</th></tr><tr><td>[all datatypes]</td><td><a href="#dt-length">length</a>,
				<a href="#dt-minLength">minLength</a>,
				<a href="#dt-maxLength">maxLength</a>,
				<a href="#dt-pattern">pattern</a>,
				<a href="#dt-enumeration">enumeration</a>,
				<a href="#dt-whiteSpace">whiteSpace</a></td></tr><tr><th align="center" colspan="2">
				If <a href="#defn-variety">{variety}</a> is
				<a href="#dt-union">union</a>, then
			</th></tr><tr><td>[all datatypes]</td><td><a href="#dt-pattern">pattern</a>,
				<a href="#dt-enumeration">enumeration</a></td></tr><tr><th align="center" colspan="2">
				else if <a href="#defn-variety">{variety}</a> is
				<a href="#dt-atomic">atomic</a>, then
			</th></tr><tr><td><a href="#string">string</a></td><td><a href="#dc-length">length</a>, <a href="#dc-minLength">minLength</a>, <a href="#dc-maxLength">maxLength</a>, <a href="#dc-pattern">pattern</a>, <a href="#dc-enumeration">enumeration</a>, <a href="#dc-whiteSpace">whiteSpace</a></td></tr><tr><td><a href="#boolean">boolean</a></td><td><a href="#dc-pattern">pattern</a>, <a href="#dc-whiteSpace">whiteSpace</a></td></tr><tr><td><a href="#float">float</a></td><td><a href="#dc-pattern">pattern</a>, <a href="#dc-enumeration">enumeration</a>, <a href="#dc-whiteSpace">whiteSpace</a>, <a href="#dc-maxInclusive">maxInclusive</a>, <a href="#dc-maxExclusive">maxExclusive</a>, <a href="#dc-minInclusive">minInclusive</a>, <a href="#dc-minExclusive">minExclusive</a></td></tr><tr><td><a href="#double">double</a></td><td><a href="#dc-pattern">pattern</a>, <a href="#dc-enumeration">enumeration</a>, <a href="#dc-whiteSpace">whiteSpace</a>, <a href="#dc-maxInclusive">maxInclusive</a>, <a href="#dc-maxExclusive">maxExclusive</a>, <a href="#dc-minInclusive">minInclusive</a>, <a href="#dc-minExclusive">minExclusive</a></td></tr><tr><td><a href="#decimal">decimal</a></td><td><a href="#dc-totalDigits">totalDigits</a>, <a href="#dc-fractionDigits">fractionDigits</a>, <a href="#dc-pattern">pattern</a>, <a href="#dc-whiteSpace">whiteSpace</a>, <a href="#dc-enumeration">enumeration</a>, <a href="#dc-maxInclusive">maxInclusive</a>, <a href="#dc-maxExclusive">maxExclusive</a>, <a href="#dc-minInclusive">minInclusive</a>, <a href="#dc-minExclusive">minExclusive</a></td></tr><tr><td><a href="#duration">duration</a></td><td><a href="#dc-pattern">pattern</a>, <a href="#dc-enumeration">enumeration</a>, <a href="#dc-whiteSpace">whiteSpace</a>, <a href="#dc-maxInclusive">maxInclusive</a>, <a href="#dc-maxExclusive">maxExclusive</a>, <a href="#dc-minInclusive">minInclusive</a>, <a href="#dc-minExclusive">minExclusive</a></td></tr><tr><td><a href="#dateTime">dateTime</a></td><td><a href="#dc-pattern">pattern</a>, <a href="#dc-enumeration">enumeration</a>, <a href="#dc-whiteSpace">whiteSpace</a>, <a href="#dc-maxInclusive">maxInclusive</a>, <a href="#dc-maxExclusive">maxExclusive</a>, <a href="#dc-minInclusive">minInclusive</a>, <a href="#dc-minExclusive">minExclusive</a></td></tr><tr><td><a href="#time">time</a></td><td><a href="#dc-pattern">pattern</a>, <a href="#dc-enumeration">enumeration</a>, <a href="#dc-whiteSpace">whiteSpace</a>, <a href="#dc-maxInclusive">maxInclusive</a>, <a href="#dc-maxExclusive">maxExclusive</a>, <a href="#dc-minInclusive">minInclusive</a>, <a href="#dc-minExclusive">minExclusive</a></td></tr><tr><td><a href="#date">date</a></td><td><a href="#dc-pattern">pattern</a>, <a href="#dc-enumeration">enumeration</a>, <a href="#dc-whiteSpace">whiteSpace</a>, <a href="#dc-maxInclusive">maxInclusive</a>, <a href="#dc-maxExclusive">maxExclusive</a>, <a href="#dc-minInclusive">minInclusive</a>, <a href="#dc-minExclusive">minExclusive</a></td></tr><tr><td><a href="#gYearMonth">gYearMonth</a></td><td><a href="#dc-pattern">pattern</a>, <a href="#dc-enumeration">enumeration</a>, <a href="#dc-whiteSpace">whiteSpace</a>, <a href="#dc-maxInclusive">maxInclusive</a>, <a href="#dc-maxExclusive">maxExclusive</a>, <a href="#dc-minInclusive">minInclusive</a>, <a href="#dc-minExclusive">minExclusive</a></td></tr><tr><td><a href="#gYear">gYear</a></td><td><a href="#dc-pattern">pattern</a>, <a href="#dc-enumeration">enumeration</a>, <a href="#dc-whiteSpace">whiteSpace</a>, <a href="#dc-maxInclusive">maxInclusive</a>, <a href="#dc-maxExclusive">maxExclusive</a>, <a href="#dc-minInclusive">minInclusive</a>, <a href="#dc-minExclusive">minExclusive</a></td></tr><tr><td><a href="#gMonthDay">gMonthDay</a></td><td><a href="#dc-pattern">pattern</a>, <a href="#dc-enumeration">enumeration</a>, <a href="#dc-whiteSpace">whiteSpace</a>, <a href="#dc-maxInclusive">maxInclusive</a>, <a href="#dc-maxExclusive">maxExclusive</a>, <a href="#dc-minInclusive">minInclusive</a>, <a href="#dc-minExclusive">minExclusive</a></td></tr><tr><td><a href="#gDay">gDay</a></td><td><a href="#dc-pattern">pattern</a>, <a href="#dc-enumeration">enumeration</a>, <a href="#dc-whiteSpace">whiteSpace</a>, <a href="#dc-maxInclusive">maxInclusive</a>, <a href="#dc-maxExclusive">maxExclusive</a>, <a href="#dc-minInclusive">minInclusive</a>, <a href="#dc-minExclusive">minExclusive</a></td></tr><tr><td><a href="#gMonth">gMonth</a></td><td><a href="#dc-pattern">pattern</a>, <a href="#dc-enumeration">enumeration</a>, <a href="#dc-whiteSpace">whiteSpace</a>, <a href="#dc-maxInclusive">maxInclusive</a>, <a href="#dc-maxExclusive">maxExclusive</a>, <a href="#dc-minInclusive">minInclusive</a>, <a href="#dc-minExclusive">minExclusive</a></td></tr><tr><td><a href="#hexBinary">hexBinary</a></td><td><a href="#dc-length">length</a>, <a href="#dc-minLength">minLength</a>, <a href="#dc-maxLength">maxLength</a>, <a href="#dc-pattern">pattern</a>, <a href="#dc-enumeration">enumeration</a>, <a href="#dc-whiteSpace">whiteSpace</a></td></tr><tr><td><a href="#base64Binary">base64Binary</a></td><td><a href="#dc-length">length</a>, <a href="#dc-minLength">minLength</a>, <a href="#dc-maxLength">maxLength</a>, <a href="#dc-pattern">pattern</a>, <a href="#dc-enumeration">enumeration</a>, <a href="#dc-whiteSpace">whiteSpace</a></td></tr><tr><td><a href="#anyURI">anyURI</a></td><td><a href="#dc-length">length</a>, <a href="#dc-minLength">minLength</a>, <a href="#dc-maxLength">maxLength</a>, <a href="#dc-pattern">pattern</a>, <a href="#dc-enumeration">enumeration</a>, <a href="#dc-whiteSpace">whiteSpace</a></td></tr><tr><td><a href="#QName">QName</a></td><td><a href="#dc-length">length</a>, <a href="#dc-minLength">minLength</a>, <a href="#dc-maxLength">maxLength</a>, <a href="#dc-pattern">pattern</a>, <a href="#dc-enumeration">enumeration</a>, <a href="#dc-whiteSpace">whiteSpace</a></td></tr><tr><td><a href="#NOTATION">NOTATION</a></td><td><a href="#dc-length">length</a>, <a href="#dc-minLength">minLength</a>, <a href="#dc-maxLength">maxLength</a>, <a href="#dc-pattern">pattern</a>, <a href="#dc-enumeration">enumeration</a>, <a href="#dc-whiteSpace">whiteSpace</a></td></tr></table></div></div><div class="constraintnote"><a name="cos-list-of-atomic" id="cos-list-of-atomic"/><b>Schema Component Constraint:  list of atomic</b><br/><div class="constraint">
If <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a>, then
the <a class="propref" href="#defn-variety">{variety}</a> of <a class="propref" href="#defn-itemType">{item type definition}</a>
&#xa0;<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a> or
<a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a>.
</div></div><div class="constraintnote"><a name="cos-no-circular-unions" id="cos-no-circular-unions"/><b>Schema Component Constraint:  no circular unions</b><br/><div class="constraint">
If <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a>,
then
it is an <a class="termref" href="#dt-error"><span class="arrow">&#xb7;</span>error<span class="arrow">&#xb7;</span></a> if
<a class="propref" href="#defn-name">{name}</a> and <a class="propref" href="#defn-target-namespace">{target namespace}</a>
&#xa0;<a class="termref" href="#dt-match"><span class="arrow">&#xb7;</span>match<span class="arrow">&#xb7;</span></a>&#xa0;<a class="propref" href="#defn-name">{name}</a>
and <a class="propref" href="#defn-target-namespace">{target namespace}</a> of any member of
<a class="propref" href="#defn-memberTypes">{member type definitions}</a>.
</div></div></div><div class="div3">
<h4><a id="anySimpleType-component" name="anySimpleType-component"/>4.1.6 Simple Type Definition for anySimpleType</h4><p>
There is a simple type definition nearly equivalent to the simple version
of the <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-urType">ur-type definition</a> present
in every schema by definition.  It has the following properties:
</p><div class="schemaComp"><div class="compHeader"><span class="schemaComp">Schema&#xa0;Component</span>:&#xa0;<a href="#dt-anySimpleType">anySimpleType</a></div><div class="compBody">
<dl class="props">
<dt><a name="anySimpleType-name" id="anySimpleType-name"><span class="propdef">{name}</span></a></dt><dd>
anySimpleType
</dd>
<dt><a name="anySimpleType-target_namespace" id="anySimpleType-target_namespace"><span class="propdef">{target namespace}</span></a></dt><dd>
http://www.w3.org/2001/XMLSchema
</dd>
<dt><a name="anySimpleType-basetype" id="anySimpleType-basetype"><span class="propdef">{basetype definition}</span></a></dt><dd>
<a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#ur-type-itself">the ur-type definition</a>
</dd>
<dt><a name="anySimpleType-final" id="anySimpleType-final"><span class="propdef">{final}</span></a></dt><dd>
the empty set
</dd>
<dt><a name="anySimpleType-variety" id="anySimpleType-variety"><span class="propdef">{variety}</span></a></dt><dd>
<a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-null">absent</a>
</dd>
</dl>
</div></div></div></div><div class="div2">
<h3 class="withToc"><span class="nav"><a class="nav" href="#rf-defn"><img src="previous.jpg" alt="previous sub-section"/></a> <a class="nav" href="#rf-facets"><img src="next.jpg" alt="next sub-section"/></a></span><a id="rf-fund-facets" name="rf-fund-facets"/>4.2 Fundamental Facets</h3><div class="localToc">&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;4.2.1 <a href="#equal">equal</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;4.2.2 <a href="#rf-ordered">ordered</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;4.2.3 <a href="#rf-bounded">bounded</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;4.2.4 <a href="#rf-cardinality">cardinality</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;4.2.5 <a href="#rf-numeric">numeric</a><br/>
</div><div class="div3">
<h4><a id="equal" name="equal"/>4.2.1 equal</h4><p>
Every <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> supports the notion of equality,
with the following rules:
</p><ul><li>
for any <em>a</em> and <em>b</em> in
the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>,
either <em>a</em> is equal to <em>b</em>,
denoted <em>a = b</em>, or <em>a</em>
is not equal to <em>b</em>, denoted <em>a != b</em>
</li><li>
there is no pair <em>a</em> and <em>b</em>
from the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> such that both
<em>a = b</em> and <em>a != b</em>
</li><li>
for all <em>a</em> in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>,
<em>a = a</em>
</li><li>
for any <em>a</em> and <em>b</em>
in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>,
<em>a = b</em> if and only if <em>b = a</em>
</li><li>
for any <em>a</em>, <em>b</em> and
<em>c</em> in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>,
if <em>a = b</em> and
<em>b = c</em>, then <em>a = c</em>
</li><li>
for any <em>a</em> and <em>b</em>
in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
if <em>a = b</em>, then <em>a</em>
and <em>b</em> cannot be distinguished
(i.e., equality is identity)
</li><li>
the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>s of all
<a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a> datatypes are disjoint (they do not
share any values)

</li></ul><p>

</p><p>
On every datatype, the operation Equal is defined in terms of the equality
property of the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>: for any values
<em>a, b</em> drawn from the
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>, <em>Equal(a,b)</em> is
true if <em>a = b</em>, and false otherwise.
</p><p>
Note that in consequence of the above:
</p><ul><li>given <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>&#xa0;<em>A</em> and
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>&#xa0;<em>B</em> where
<em>A</em> and <em>B</em> are disjoint,
every pair of values <em>a</em> from <em>A</em>
and <em>b</em> from <em>B</em>,
<em>a != b</em></li><li>
two values which are members of the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
of the same <a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a> datatype may always be
compared with each other
</li><li>
if a datatype <em>T</em> is
<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> by <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a> from
<a class="termref" href="#dt-memberTypes"><span class="arrow">&#xb7;</span>memberTypes<span class="arrow">&#xb7;</span></a>&#xa0;<em>A, B, ...</em>
then the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <em>T</em> is the
union of <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>s of its
<a class="termref" href="#dt-memberTypes"><span class="arrow">&#xb7;</span>memberTypes<span class="arrow">&#xb7;</span></a>&#xa0;<em>A, B, ...</em>.
Some values in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of
<em>T</em> are also values in the
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <em>A</em>.
Other values in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of
<em>T</em> will be values in the
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <em>B</em> and so on.
Values in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <em>T</em>
which are also in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of
<em>A</em> can be compared with other values in the
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <em>A</em> according
to the above rules.  Similarly for values of type
<em>T</em> and <em>B</em> and all the other
<a class="termref" href="#dt-memberTypes"><span class="arrow">&#xb7;</span>memberTypes<span class="arrow">&#xb7;</span></a>.
</li><li>
if a datatype <em>T'</em> is <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>
by <a class="termref" href="#dt-restriction"><span class="arrow">&#xb7;</span>restriction<span class="arrow">&#xb7;</span></a> from an atomic datatype <em>T</em>
then the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <em>T'</em> is
a subset of the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <em>T</em>.
Values in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>s of
<em>T</em> and <em>T'</em> can be compared
according to the above rules
</li><li>
if datatypes <em>T'</em> and <em>T''</em> are
<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> by <a class="termref" href="#dt-restriction"><span class="arrow">&#xb7;</span>restriction<span class="arrow">&#xb7;</span></a> from a
common atomic ancestor <em>T</em> then the
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>s of <em>T'</em> and
<em>T''</em> may overlap. Values in the
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>s
of <em>T'</em> and <em>T''</em> can be
compared according to the above rules
</li></ul><div class="note"><b>Note:&#xa0;</b>
There is no schema component corresponding to the <b>equal</b>
<a class="termref" href="#dt-fundamental-facet"><span class="arrow">&#xb7;</span>fundamental facet<span class="arrow">&#xb7;</span></a>.
</div></div><div class="div3">
<h4><a id="rf-ordered" name="rf-ordered"/>4.2.2 ordered</h4><p>
<span class="termdef"><a id="dt-order-relation" name="dt-order-relation">[Definition:]&#xa0;&#xa0;</a>An
<b>order relation</b> on a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
is a mathematical relation that imposes a
<a class="termref" href="#dt-total-order"><span class="arrow">&#xb7;</span>total order<span class="arrow">&#xb7;</span></a> or a <a class="termref" href="#dt-partial-order"><span class="arrow">&#xb7;</span>partial order<span class="arrow">&#xb7;</span></a> on the
members of the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>.
</span>
</p><p>
<span class="termdef"><a id="dt-ordered" name="dt-ordered">[Definition:]&#xa0;&#xa0;</a>A
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>, and hence a datatype, is said to be
<b>ordered</b> if there exists an
<a class="termref" href="#dt-order-relation"><span class="arrow">&#xb7;</span>order-relation<span class="arrow">&#xb7;</span></a> defined for that
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>.
</span>
</p><p>
<span class="termdef"><a id="dt-partial-order" name="dt-partial-order">[Definition:]&#xa0;&#xa0;</a>
A <b>partial order</b> is an <a class="termref" href="#dt-order-relation"><span class="arrow">&#xb7;</span>order-relation<span class="arrow">&#xb7;</span></a>
that is <b>irreflexive</b>, <b>asymmetric</b> and
<b>transitive</b>.
</span>
</p><p>
A <a class="termref" href="#dt-partial-order"><span class="arrow">&#xb7;</span>partial order<span class="arrow">&#xb7;</span></a> has the following properties:
</p><ul><li>

for no <em>a</em> in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>,
<em>a &lt; a</em>
(irreflexivity)
</li><li>

for all <em>a</em> and <em>b</em>
in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>,
<em>a &lt; b</em>
implies not(<em>b &lt; a</em>)
(asymmetry)
</li><li>

for all <em>a</em>, <em>b</em>
and <em>c</em>  in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>,
<em>a &lt; b</em> and <em>b &lt; c</em>
implies <em>a &lt; c</em>
(transitivity)
</li></ul><p>
The notation <em>a &lt;&gt; b</em> is used to indicate the
case when <em>a != b</em> and neither
<em>a &lt; b</em> nor <em>b &lt; a</em>.

For any values <em>a</em> and <em>b</em>
from different <a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a>&#xa0;<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>s,
<em>a &lt;&gt; b</em>.
</p><p><span class="termdef"><a id="dt-incomparable" name="dt-incomparable">[Definition:]&#xa0;&#xa0;</a>When  <em>a &lt;&gt; b</em>, <em>a</em> and <em>b</em> are <b>incomparable</b>,</span><span class="termdef"><a id="dt-comparable" name="dt-comparable">[Definition:]&#xa0;&#xa0;</a>otherwise they are <b>comparable</b>.</span></p><p>
<span class="termdef"><a id="dt-total-order" name="dt-total-order">[Definition:]&#xa0;&#xa0;</a>
A <b>total order</b> is an <a class="termref" href="#dt-partial-order"><span class="arrow">&#xb7;</span>partial order<span class="arrow">&#xb7;</span></a>
such that for no <em>a</em> and <em>b</em>
is it the case that <em>a &lt;&gt; b</em>.
</span>
</p><p>
A <a class="termref" href="#dt-total-order"><span class="arrow">&#xb7;</span>total order<span class="arrow">&#xb7;</span></a> has all of the properties specified
above for <a class="termref" href="#dt-partial-order"><span class="arrow">&#xb7;</span>partial order<span class="arrow">&#xb7;</span></a>, plus
the following property:
</p><ul><li>
for all <em>a</em> and <em>b</em>
 in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>,
either <em>a &lt; b</em> or <em>b &lt; a</em>
or <em>a = b</em>
</li></ul><div class="note"><b>Note:&#xa0;</b>
The fact that this specification does not define an
<a class="termref" href="#dt-order-relation"><span class="arrow">&#xb7;</span>order-relation<span class="arrow">&#xb7;</span></a> for some datatype does not
mean that some other application cannot treat that datatype as
being ordered by imposing its own order relation.
</div><p>
<a class="termref" href="#dt-ordered"><span class="arrow">&#xb7;</span>ordered<span class="arrow">&#xb7;</span></a> provides for:
</p><ul><li>
indicating whether an <a class="termref" href="#dt-order-relation"><span class="arrow">&#xb7;</span>order-relation<span class="arrow">&#xb7;</span></a> is
defined on a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>, and if so,
whether that <a class="termref" href="#dt-order-relation"><span class="arrow">&#xb7;</span>order-relation<span class="arrow">&#xb7;</span></a> is
a <a class="termref" href="#dt-partial-order"><span class="arrow">&#xb7;</span>partial order<span class="arrow">&#xb7;</span></a> or a <a class="termref" href="#dt-total-order"><span class="arrow">&#xb7;</span>total order<span class="arrow">&#xb7;</span></a>
</li></ul><div class="div4">
<h5><a id="dc-ordered" name="dc-ordered"/>4.2.2.1 The ordered Schema Component</h5><div class="schemaComp"><div class="compHeader"><span class="schemaComp">Schema&#xa0;Component</span>:&#xa0;<a href="#dt-ordered">ordered</a></div><div class="compBody">
<dl class="props">
<dt><a name="ordered-value" id="ordered-value"><span class="propdef">{value}</span></a></dt><dd>
One of <em>{false, partial, total}</em>.
</dd>
</dl>
</div></div><p>
<a class="propref" href="#ordered-value">{value}</a> depends on <a class="propref" href="#defn-variety">{variety}</a>,
<a class="propref" href="#defn-facets">{facets}</a> and <a class="propref" href="#defn-memberTypes">{member type definitions}</a>
in the <a href="#dc-defn">Simple Type Definition</a> component in which a
<a class="termref" href="#dt-ordered"><span class="arrow">&#xb7;</span>ordered<span class="arrow">&#xb7;</span></a> component appears as a member of
<a class="propref" href="#defn-fund-facets">{fundamental facets}</a>.
</p><p>
When <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a>,
<a class="propref" href="#ordered-value">{value}</a> is inherited from
<a class="propref" href="#ordered-value">{value}</a> of <a class="propref" href="#defn-basetype">{base type definition}</a>.
For all <a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a> types <a class="propref" href="#numeric-value">{value}</a>
is as specified	in the table in <a href="#app-fundamental-facets">Fundamental Facets (&#xa7;C.1)</a>.
</p><p>
When <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a>,
<a class="propref" href="#ordered-value">{value}</a> is <em>false</em>.
</p><p>
When <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a>,

<a class="propref" href="#ordered-value">{value}</a> is <em>partial</em> unless one of the
following:
</p><ul><li>
If every member of <a class="propref" href="#defn-memberTypes">{member type definitions}</a> is derived from
a common ancestor other than the simple ur-type, then <a class="propref" href="#ordered-value">{value}</a>
is the same as that ancestor's <b>ordered</b> facet
</li><li>
If every member of <a class="propref" href="#defn-memberTypes">{member type definitions}</a> has a
<a class="propref" href="#ordered-value">{value}</a> of <em>false</em> for the <b>ordered</b>
facet, then <a class="propref" href="#ordered-value">{value}</a> is <em>false</em>
</li></ul></div></div><div class="div3">
<h4><a id="rf-bounded" name="rf-bounded"/>4.2.3 bounded</h4><p>
<span class="termdef"><a id="dt-inclusive-upper-bound" name="dt-inclusive-upper-bound">[Definition:]&#xa0;&#xa0;</a>
A value <em>u</em> in an <a class="termref" href="#dt-ordered"><span class="arrow">&#xb7;</span>ordered<span class="arrow">&#xb7;</span></a>
&#xa0;<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>&#xa0;<em>U</em>
is said to be an <b>inclusive upper bound</b> of a
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>&#xa0;<em>V</em>
(where <em>V</em> is a subset of <em>U</em>)
if for all <em>v</em> in <em>V</em>,
<em>u</em> &gt;= <em>v</em>.
</span>
</p><p>
<span class="termdef"><a id="dt-exclusive-upper-bound" name="dt-exclusive-upper-bound">[Definition:]&#xa0;&#xa0;</a>
A value <em>u</em> in an <a class="termref" href="#dt-ordered"><span class="arrow">&#xb7;</span>ordered<span class="arrow">&#xb7;</span></a>
&#xa0;<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>&#xa0;<em>U</em>
is said to be an <b>exclusive upper bound</b> of a
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>&#xa0;<em>V</em>
(where <em>V</em> is a subset of <em>U</em>)
if for all <em>v</em> in <em>V</em>,
<em>u</em> &gt; <em>v</em>.
</span>
</p><p>
<span class="termdef"><a id="dt-inclusive-lower-bound" name="dt-inclusive-lower-bound">[Definition:]&#xa0;&#xa0;</a>
A value <em>l</em> in an <a class="termref" href="#dt-ordered"><span class="arrow">&#xb7;</span>ordered<span class="arrow">&#xb7;</span></a>
&#xa0;<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>&#xa0;<em>L</em>
is said to be an <b>inclusive lower bound</b> of a
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>&#xa0;<em>V</em>
(where <em>V</em> is a subset of <em>L</em>)
if for all <em>v</em> in <em>V</em>,
<em>l</em> &lt;= <em>v</em>.
</span>
</p><p>
<span class="termdef"><a id="dt-exclusive-lower-bound" name="dt-exclusive-lower-bound">[Definition:]&#xa0;&#xa0;</a>
A value <em>l</em> in an <a class="termref" href="#dt-ordered"><span class="arrow">&#xb7;</span>ordered<span class="arrow">&#xb7;</span></a>
&#xa0;<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>&#xa0;<em>L</em>
is said to be an <b>exclusive lower bound</b> of a
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>&#xa0;<em>V</em>
(where <em>V</em> is a subset of <em>L</em>)
if for all <em>v</em> in <em>V</em>,
<em>l</em> &lt; <em>v</em>.
</span>
</p><p>
<span class="termdef"><a id="dt-bounded" name="dt-bounded">[Definition:]&#xa0;&#xa0;</a>A datatype is <b>bounded</b>
if its <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> has either an
<a class="termref" href="#dt-inclusive-upper-bound"><span class="arrow">&#xb7;</span>inclusive upper bound<span class="arrow">&#xb7;</span></a> or an <a class="termref" href="#dt-exclusive-upper-bound"><span class="arrow">&#xb7;</span>exclusive upper bound<span class="arrow">&#xb7;</span></a>
and either an <a class="termref" href="#dt-inclusive-lower-bound"><span class="arrow">&#xb7;</span>inclusive lower bound<span class="arrow">&#xb7;</span></a> or
 an
<a class="termref" href="#dt-exclusive-lower-bound"><span class="arrow">&#xb7;</span>exclusive lower bound<span class="arrow">&#xb7;</span></a>.
</span>
</p><p>
<a class="termref" href="#dt-bounded"><span class="arrow">&#xb7;</span>bounded<span class="arrow">&#xb7;</span></a> provides for:
</p><ul><li>
indicating whether a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> is
<a class="termref" href="#dt-bounded"><span class="arrow">&#xb7;</span>bounded<span class="arrow">&#xb7;</span></a>
</li></ul><div class="div4">
<h5><a id="dc-bounded" name="dc-bounded"/>4.2.3.1 The bounded Schema Component</h5><div class="schemaComp"><div class="compHeader"><span class="schemaComp">Schema&#xa0;Component</span>:&#xa0;<a href="#dt-bounded">bounded</a></div><div class="compBody">
<dl class="props">
<dt><a name="bounded-value" id="bounded-value"><span class="propdef">{value}</span></a></dt><dd>
A <a href="#boolean">boolean</a>.
</dd>
</dl>
</div></div><p>
<a class="propref" href="#bounded-value">{value}</a> depends on <a class="propref" href="#defn-variety">{variety}</a>,
<a class="propref" href="#defn-facets">{facets}</a> and <a class="propref" href="#defn-memberTypes">{member type definitions}</a>
in the <a href="#dc-defn">Simple Type Definition</a> component in which a
<a class="termref" href="#dt-bounded"><span class="arrow">&#xb7;</span>bounded<span class="arrow">&#xb7;</span></a> component appears as a member of
<a class="propref" href="#defn-fund-facets">{fundamental facets}</a>.
</p><p>
When <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a>,
if one of <a class="termref" href="#dt-minInclusive"><span class="arrow">&#xb7;</span>minInclusive<span class="arrow">&#xb7;</span></a> or <a class="termref" href="#dt-minExclusive"><span class="arrow">&#xb7;</span>minExclusive<span class="arrow">&#xb7;</span></a>
and one of <a class="termref" href="#dt-maxInclusive"><span class="arrow">&#xb7;</span>maxInclusive<span class="arrow">&#xb7;</span></a> or <a class="termref" href="#dt-maxExclusive"><span class="arrow">&#xb7;</span>maxExclusive<span class="arrow">&#xb7;</span></a>
are among <a class="propref" href="#defn-facets">{facets}</a>&#xa0;, then
<a class="propref" href="#bounded-value">{value}</a> is <em>true</em>; else
<a class="propref" href="#bounded-value">{value}</a> is <em>false</em>.
</p><p>
When <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a>,
if <a class="termref" href="#dt-length"><span class="arrow">&#xb7;</span>length<span class="arrow">&#xb7;</span></a> or both of
<a class="termref" href="#dt-minLength"><span class="arrow">&#xb7;</span>minLength<span class="arrow">&#xb7;</span></a> and <a class="termref" href="#dt-maxLength"><span class="arrow">&#xb7;</span>maxLength<span class="arrow">&#xb7;</span></a>
are among <a class="propref" href="#defn-facets">{facets}</a>, then
<a class="propref" href="#bounded-value">{value}</a> is <em>true</em>; else
<a class="propref" href="#bounded-value">{value}</a> is <em>false</em>.
</p><p>
When <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a>,
if <a class="propref" href="#bounded-value">{value}</a> is <em>true</em>
for every member of <a class="propref" href="#defn-memberTypes">{member type definitions}</a>
and all members of <a class="propref" href="#defn-memberTypes">{member type definitions}</a> share a common
ancestor, then <a class="propref" href="#bounded-value">{value}</a> is <em>true</em>;
else <a class="propref" href="#bounded-value">{value}</a> is <em>false</em>.
</p></div></div><div class="div3">
<h4><a id="rf-cardinality" name="rf-cardinality"/>4.2.4 cardinality</h4><p>
<span class="termdef"><a id="dt-cardinality" name="dt-cardinality">[Definition:]&#xa0;&#xa0;</a>Every
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> has associated with it the concept of
<b>cardinality</b>.  Some <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>s
are finite, some are countably infinite while still others could
conceivably be uncountably infinite (although no <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
defined by this specification is uncountable infinite). A datatype is
said to have the cardinality of its
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>.
</span>
</p><p>
It
is sometimes useful to categorize <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>s
(and hence, datatypes) as to their cardinality.  There are two
significant cases:
</p><ul><li>
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>s that are finite
</li><li>
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>s that are countably infinite
</li></ul><p>
<a class="termref" href="#dt-cardinality"><span class="arrow">&#xb7;</span>cardinality<span class="arrow">&#xb7;</span></a> provides for:
</p><ul><li>
indicating whether the <a class="termref" href="#dt-cardinality"><span class="arrow">&#xb7;</span>cardinality<span class="arrow">&#xb7;</span></a>
of a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> is
<em>finite</em> or <em>countably infinite</em>
</li></ul><div class="div4">
<h5><a id="dc-cardinality" name="dc-cardinality"/>4.2.4.1 The cardinality Schema Component</h5><div class="schemaComp"><div class="compHeader"><span class="schemaComp">Schema&#xa0;Component</span>:&#xa0;<a href="#dt-cardinality">cardinality</a></div><div class="compBody">
<dl class="props">
<dt><a name="cardinality-value" id="cardinality-value"><span class="propdef">{value}</span></a></dt><dd>
One of <em>{finite, countably infinite}</em>.
</dd>
</dl>
</div></div><p>
<a class="propref" href="#cardinality-value">{value}</a> depends on <a class="propref" href="#defn-variety">{variety}</a>,
<a class="propref" href="#defn-facets">{facets}</a> and <a class="propref" href="#defn-memberTypes">{member type definitions}</a>
in the <a href="#dc-defn">Simple Type Definition</a> component in which a
<a class="termref" href="#dt-cardinality"><span class="arrow">&#xb7;</span>cardinality<span class="arrow">&#xb7;</span></a> component appears as a member of
<a class="propref" href="#defn-fund-facets">{fundamental facets}</a>.
</p><p>
When <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a> and
<a class="propref" href="#cardinality-value">{value}</a> of <a class="propref" href="#defn-basetype">{base type definition}</a>
is <em>finite</em>, then <a class="propref" href="#cardinality-value">{value}</a> is
<em>finite</em>.
</p><p>
When <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a> and
<a class="propref" href="#cardinality-value">{value}</a> of <a class="propref" href="#defn-basetype">{base type definition}</a>
is <em>countably infinite</em> and <b>either</b> of the following
conditions are true, then <a class="propref" href="#cardinality-value">{value}</a> is
<em>finite</em>; else <a class="propref" href="#cardinality-value">{value}</a>
is <em>countably infinite</em>:
</p><ol class="enumar"><li>
one of <a class="termref" href="#dt-length"><span class="arrow">&#xb7;</span>length<span class="arrow">&#xb7;</span></a>, <a class="termref" href="#dt-maxLength"><span class="arrow">&#xb7;</span>maxLength<span class="arrow">&#xb7;</span></a>,
<a class="termref" href="#dt-totalDigits"><span class="arrow">&#xb7;</span>totalDigits<span class="arrow">&#xb7;</span></a> is among <a class="propref" href="#defn-facets">{facets}</a>,
</li><li>
<b>all</b> of the following are true:
<ol class="enumla"><li>
one of <a class="termref" href="#dt-minInclusive"><span class="arrow">&#xb7;</span>minInclusive<span class="arrow">&#xb7;</span></a> or
<a class="termref" href="#dt-minExclusive"><span class="arrow">&#xb7;</span>minExclusive<span class="arrow">&#xb7;</span></a>
is among <a class="propref" href="#defn-facets">{facets}</a>
</li><li>
one of <a class="termref" href="#dt-maxInclusive"><span class="arrow">&#xb7;</span>maxInclusive<span class="arrow">&#xb7;</span></a> or
<a class="termref" href="#dt-maxExclusive"><span class="arrow">&#xb7;</span>maxExclusive<span class="arrow">&#xb7;</span></a>
is among <a class="propref" href="#defn-facets">{facets}</a>
</li><li>
<b>either</b> of the following are true:
<ol class="enumlr"><li>
<a class="termref" href="#dt-fractionDigits"><span class="arrow">&#xb7;</span>fractionDigits<span class="arrow">&#xb7;</span></a> is among <a class="propref" href="#defn-facets">{facets}</a>
</li><li>
<a class="propref" href="#defn-basetype">{base type definition}</a> is one of <a href="#date">date</a>,
<a href="#gYearMonth">gYearMonth</a>, <a href="#gYear">gYear</a>, <a href="#gMonthDay">gMonthDay</a>,
<a href="#gDay">gDay</a> or <a href="#gMonth">gMonth</a> or any type <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>
from them
</li></ol></li></ol></li></ol><p>
When <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a>,
if <a class="termref" href="#dt-length"><span class="arrow">&#xb7;</span>length<span class="arrow">&#xb7;</span></a> or both of
<a class="termref" href="#dt-minLength"><span class="arrow">&#xb7;</span>minLength<span class="arrow">&#xb7;</span></a> and <a class="termref" href="#dt-maxLength"><span class="arrow">&#xb7;</span>maxLength<span class="arrow">&#xb7;</span></a>
are among <a class="propref" href="#defn-facets">{facets}</a>, then
<a class="propref" href="#cardinality-value">{value}</a> is <em>finite</em>; else
<a class="propref" href="#cardinality-value">{value}</a> is <em>countably infinite</em>.
</p><p>
When <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a>,
if <a class="propref" href="#cardinality-value">{value}</a> is <em>finite</em>
for every member of <a class="propref" href="#defn-memberTypes">{member type definitions}</a>, then
<a class="propref" href="#cardinality-value">{value}</a> is <em>finite</em>;
else <a class="propref" href="#cardinality-value">{value}</a> is <em>countably infinite</em>.
</p></div></div><div class="div3">
<h4><a id="rf-numeric" name="rf-numeric"/>4.2.5 numeric</h4><p>
<span class="termdef"><a id="dt-numeric" name="dt-numeric">[Definition:]&#xa0;&#xa0;</a>A datatype is said to be
<b>numeric</b> if its values are conceptually quantities (in some
mathematical number system).
</span>
</p><p>
<span class="termdef"><a id="dt-non-numeric" name="dt-non-numeric">[Definition:]&#xa0;&#xa0;</a>A datatype whose values
are not <a class="termref" href="#dt-numeric"><span class="arrow">&#xb7;</span>numeric<span class="arrow">&#xb7;</span></a> is said to be
<b>non-numeric</b>.
</span>
</p><p>
<a class="termref" href="#dt-numeric"><span class="arrow">&#xb7;</span>numeric<span class="arrow">&#xb7;</span></a> provides for:
</p><ul><li>
indicating whether a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> is
<a class="termref" href="#dt-numeric"><span class="arrow">&#xb7;</span>numeric<span class="arrow">&#xb7;</span></a>
</li></ul><div class="div4">
<h5><a id="dc-numeric" name="dc-numeric"/>4.2.5.1 The numeric Schema Component</h5><div class="schemaComp"><div class="compHeader"><span class="schemaComp">Schema&#xa0;Component</span>:&#xa0;<a href="#dt-numeric">numeric</a></div><div class="compBody">
<dl class="props">
<dt><a name="numeric-value" id="numeric-value"><span class="propdef">{value}</span></a></dt><dd>
A <a href="#boolean">boolean</a>
</dd>
</dl>
</div></div><p>
<a class="propref" href="#numeric-value">{value}</a> depends on <a class="propref" href="#defn-variety">{variety}</a>,
<a class="propref" href="#defn-facets">{facets}</a>, <a class="propref" href="#defn-basetype">{base type definition}</a> and
<a class="propref" href="#defn-memberTypes">{member type definitions}</a> in the <a href="#dc-defn">Simple Type Definition</a> component
in which a <a class="termref" href="#dt-cardinality"><span class="arrow">&#xb7;</span>cardinality<span class="arrow">&#xb7;</span></a> component appears as a member of
<a class="propref" href="#defn-fund-facets">{fundamental facets}</a>.
</p><p>
When <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a>,
<a class="propref" href="#numeric-value">{value}</a> is inherited from
<a class="propref" href="#numeric-value">{value}</a> of <a class="propref" href="#defn-basetype">{base type definition}</a>.
For all <a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a> types <a class="propref" href="#numeric-value">{value}</a>
is as specified	in the table in <a href="#app-fundamental-facets">Fundamental Facets (&#xa7;C.1)</a>.
</p><p>
When <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a>,
<a class="propref" href="#numeric-value">{value}</a> is <em>false</em>.
</p><p>
When <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a>,
if <a class="propref" href="#numeric-value">{value}</a> is <em>true</em>
for every member of <a class="propref" href="#defn-memberTypes">{member type definitions}</a>, then
<a class="propref" href="#numeric-value">{value}</a> is <em>true</em>;
else <a class="propref" href="#numeric-value">{value}</a> is <em>false</em>.
</p></div></div></div><div class="div2">
<h3 class="withToc"><span class="nav"><a class="nav" href="#rf-fund-facets"><img src="previous.jpg" alt="previous sub-section"/></a> </span><a id="rf-facets" name="rf-facets"/>4.3 Constraining Facets</h3><div class="localToc">&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;4.3.1 <a href="#rf-length">length</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;4.3.2 <a href="#rf-minLength">minLength</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;4.3.3 <a href="#rf-maxLength">maxLength</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;4.3.4 <a href="#rf-pattern">pattern</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;4.3.5 <a href="#rf-enumeration">enumeration</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;4.3.6 <a href="#rf-whiteSpace">whiteSpace</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;4.3.7 <a href="#rf-maxInclusive">maxInclusive</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;4.3.8 <a href="#rf-maxExclusive">maxExclusive</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;4.3.9 <a href="#rf-minExclusive">minExclusive</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;4.3.10 <a href="#rf-minInclusive">minInclusive</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;4.3.11 <a href="#rf-totalDigits">totalDigits</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;4.3.12 <a href="#rf-fractionDigits">fractionDigits</a><br/>
</div><div class="div3">
<h4><a id="rf-length" name="rf-length"/>4.3.1 length</h4><p>
<span class="termdef"><a id="dt-length" name="dt-length">[Definition:]&#xa0;&#xa0;</a>
<b>length</b> is the number
of <em>units of length</em>, where <em>units of length</em>
varies depending on the type that is being <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from.
The value of
<b>length</b>&#xa0;<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be a
<a href="#nonNegativeInteger">nonNegativeInteger</a>.
</span>
</p><p>
For <a href="#string">string</a> and datatypes <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from <a href="#string">string</a>,
<b>length</b> is measured in units of <a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#dt-character">
character</a>s as defined in <a href="#XML">[XML 1.0 (Second Edition)]</a>.
For <a href="#anyURI">anyURI</a>, <b>length</b> is measured in units of
characters (as for <a href="#string">string</a>).
For <a href="#hexBinary">hexBinary</a> and <a href="#base64Binary">base64Binary</a> and datatypes <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from them,
<b>length</b> is measured in octets (8 bits) of binary data.
For datatypes <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> by <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a>,
<b>length</b> is measured in number of list items.
</p><div class="note"><b>Note:&#xa0;</b>
For <a href="#string">string</a> and datatypes <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from <a href="#string">string</a>,
<b>length</b> will not always coincide with &quot;string length&quot; as perceived
by some users or with the number of storage units in some digital representation.
Therefore, care should be taken when specifying a value for <b>length</b>
and in attempting to infer storage requirements from a given value for
<b>length</b>.
</div><p>
<a class="termref" href="#dt-length"><span class="arrow">&#xb7;</span>length<span class="arrow">&#xb7;</span></a> provides for:
</p><ul><li>
Constraining a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
to values with a specific number of <em>units of length</em>,
where <em>units of length</em>
varies depending on <a class="propref" href="#defn-basetype">{base type definition}</a>.
</li></ul><div class="exampleOuter"><div class="exampleHeader">Example</div><div class="exampleWrapper">
The following is the definition of a <a class="termref" href="#dt-user-derived"><span class="arrow">&#xb7;</span>user-derived<span class="arrow">&#xb7;</span></a>
datatype to represent product codes which must be
exactly 8 characters in length.  By fixing the value of the
<b>length</b> facet we ensure that types derived from productCode can
change or set the values of other facets, such as <b>pattern</b>, but
cannot change the length.
</div><div class="exampleInner"><pre>&lt;simpleType name='productCode'&gt;
   &lt;restriction base='string'&gt;
     &lt;length value='8' fixed='true'/&gt;
   &lt;/restriction&gt;
&lt;/simpleType&gt;</pre></div></div><div class="div4">
<h5><a id="dc-length" name="dc-length"/>4.3.1.1 The length Schema Component</h5><div class="schemaComp"><div class="compHeader"><span class="schemaComp">Schema&#xa0;Component</span>:&#xa0;<a href="#dt-length">length</a></div><div class="compBody">
<dl class="props">
<dt><a name="length-value" id="length-value"><span class="propdef">{value}</span></a></dt><dd>
A <a href="#nonNegativeInteger">nonNegativeInteger</a>.
</dd>
<dt><a name="length-fixed" id="length-fixed"><span class="propdef">{fixed}</span></a></dt><dd>
A <a href="#boolean">boolean</a>.
</dd>
<dt><a name="length-annotation" id="length-annotation"><span class="propdef">{annotation}</span></a></dt><dd>
Optional.  An <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#Annotation">annotation</a>.
</dd>
</dl>
</div></div><p>
If <a class="propref" href="#length-fixed">{fixed}</a> is <em>true</em>, then types for which
the current type is the <a class="propref" href="#defn-basetype">{base type definition}</a> cannot specify a
value for <a href="#dc-length">length</a> other than <a class="propref" href="#length-value">{value}</a>.
</p></div><div class="div4">
<h5><a id="xr-length" name="xr-length"/>4.3.1.2 XML Representation of length Schema Components</h5><p>
The XML representation for a <a href="#dc-length">length</a> schema
component is a <a class="eltref" href="#element-length">&lt;length&gt;</a> element information item. The
correspondences between the properties of the information item and
properties of the component are as follows:
</p><div class="reprdef"><div class="reprHeader"><span class="reprdef">XML&#xa0;Representation&#xa0;Summary</span>:&#xa0;<code>length</code>&#xa0;Element Information Item</div><div class="reprBody">
<p class="element-syntax-1"><a name="element-length" id="element-length">&lt;length</a><br/>&#xa0;&#xa0;fixed = <a href="#boolean">boolean</a>&#xa0;:&#xa0;false<br/>&#xa0;&#xa0;id = <a href="#ID">ID</a><br/>&#xa0;&#xa0;<b>value</b> = <a href="#nonNegativeInteger">nonNegativeInteger</a><br/>&#xa0;&#xa0;<em>{any attributes with non-schema namespace . . .}</em>&gt;<br/><em>&#xa0;&#xa0;Content: </em>(<a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">annotation</a>?)<br/>&lt;/length&gt;</p>
<div class="reprcomp"><table class="reprcomp"><thead><tr><th><a href="#dc-fractionDigits">length</a><strong>&#xa0;Schema Component</strong></th></tr></thead><tbody><tr><td><table cellpadding="3" border="0"><thead><tr><th align="left">Property</th><th align="left">Representation</th></tr></thead><tbody valign="top"><tr valign="top"><td><a class="propref" href="#length-value">{value}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the <code>value</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>
</td></tr><tr valign="top"><td><a class="propref" href="#length-fixed">{fixed}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the <code>fixed</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>, if present, otherwise false
</td></tr><tr valign="top"><td><a class="propref" href="#defn-annotation">{annotation}</a></td><td>
The annotations corresponding to all the <a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">&lt;annotation&gt;</a>
element information items in the <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.element">[children]</a>, if any.
</td></tr></tbody></table></td></tr></tbody></table></div>
</div></div></div><div class="div4">
<h5><a id="length-validation-rules" name="length-validation-rules"/>4.3.1.3 length Validation Rules</h5><div class="constraintnote"><a name="cvc-length-valid" id="cvc-length-valid"/><b>Validation Rule:  Length Valid</b><br/><div class="constraint">
A value in a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> is facet-valid with
respect to <a class="termref" href="#dt-length"><span class="arrow">&#xb7;</span>length<span class="arrow">&#xb7;</span></a>, determined as follows:
<div class="constraintlist"><div class="clnumber">1 
if the <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a> then
<div class="constraintlist"><div class="clnumber">1.1 
if <a class="propref" href="#defn-primitive">{primitive type definition}</a> is <a href="#string">string</a> or <a href="#anyURI">anyURI</a>, then the
length of the value, as measured in <a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#dt-character">
character</a>s
<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be equal to <a class="propref" href="#length-value">{value}</a>;
</div><div class="clnumber">1.2 
if <a class="propref" href="#defn-primitive">{primitive type definition}</a> is <a href="#hexBinary">hexBinary</a> or <a href="#base64Binary">base64Binary</a>, then the
length of the value, as measured in octets of the binary data,
<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be equal to <a class="propref" href="#length-value">{value}</a>;
</div><div class="clnumber">1.3 

if <a class="propref" href="#defn-primitive">{primitive type definition}</a> is <a href="#QName">QName</a> or <a href="#NOTATION">NOTATION</a>, then
any <a class="propref" href="#length-value">{value}</a> is facet-valid.
</div></div>
</div><div class="clnumber">2 
if the <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a>,
then the length of the value, as measured
in list items, <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be equal to <a class="propref" href="#length-value">{value}</a>
</div></div></div></div><p>

The use of <a class="termref" href="#dt-length"><span class="arrow">&#xb7;</span>length<span class="arrow">&#xb7;</span></a>
on datatypes <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from <a href="#QName">QName</a> and <a href="#NOTATION">NOTATION</a>
is deprecated.  Future versions of this
specification may remove this facet for these datatypes.

</p></div><div class="div4">
<h5><a id="length-coss" name="length-coss"/>4.3.1.4 Constraints on length Schema Components</h5><div class="constraintnote"><a name="length-minLength-maxLength" id="length-minLength-maxLength"/><b>Schema Component Constraint:  length and minLength or maxLength</b><br/><div class="constraint">If <a href="#dc-length">length</a> is a member of <a class="propref" href="#defn-facets">{facets}</a> then
  <div class="constraintlist"><div class="clnumber">1 It is an error for <a href="#dc-minLength">minLength</a> to be a member of
<a class="propref" href="#defn-facets">{facets}</a> unless
     <div class="constraintlist"><div class="clnumber">1.1 the <a class="propref" href="#minLength-value">{value}</a> of <a href="#dc-minLength">minLength</a> &lt;= the <a class="propref" href="#length-value">{value}</a> of <a href="#dc-length">length</a> and</div><div class="clnumber">1.2 there is type definition from which this one is derived by
         one or more restriction steps in which <a href="#dc-minLength">minLength</a> has the same
         <a class="propref" href="#minLength-value">{value}</a> and <a href="#dc-length">length</a> is not specified.</div></div>
    </div><div class="clnumber">2 It is an error for <a href="#dc-maxLength">maxLength</a> to be a member of
<a class="propref" href="#defn-facets">{facets}</a> unless
     <div class="constraintlist"><div class="clnumber">2.1 the <a class="propref" href="#length-value">{value}</a> of <a href="#dc-length">length</a> &lt;= the <a class="propref" href="#maxLength-value">{value}</a> of <a href="#dc-maxLength">maxLength</a> and</div><div class="clnumber">2.2 there is type definition from which this one is derived by
         one or more restriction steps in which <a href="#dc-maxLength">maxLength</a> has the same
         <a class="propref" href="#maxLength-value">{value}</a> and <a href="#dc-length">length</a> is not specified.</div></div>
    </div></div>
 </div></div><div class="constraintnote"><a name="length-valid-restriction" id="length-valid-restriction"/><b>Schema Component Constraint:  length valid restriction</b><br/><div class="constraint">
It is an <a class="termref" href="#dt-error"><span class="arrow">&#xb7;</span>error<span class="arrow">&#xb7;</span></a> if <a href="#dc-length">length</a>
is among the members of <a class="propref" href="#defn-facets">{facets}</a> of
<a class="propref" href="#defn-basetype">{base type definition}</a> and <a class="propref" href="#length-value">{value}</a> is
not equal to the <a class="propref" href="#length-value">{value}</a> of the parent
<a href="#dc-length">length</a>.
</div></div></div></div><div class="div3">
<h4><a id="rf-minLength" name="rf-minLength"/>4.3.2 minLength</h4><p>
<span class="termdef"><a id="dt-minLength" name="dt-minLength">[Definition:]&#xa0;&#xa0;</a>
<b>minLength</b> is
the minimum number of <em>units of length</em>, where
<em>units of length</em> varies depending on the type that is being
<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from.
The value of <b>minLength</b>
&#xa0;<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be a <a href="#nonNegativeInteger">nonNegativeInteger</a>.
</span>
</p><p>
For <a href="#string">string</a> and datatypes <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from <a href="#string">string</a>,
<b>minLength</b> is measured in units of <a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#dt-character">
character</a>s as defined in <a href="#XML">[XML 1.0 (Second Edition)]</a>.
For <a href="#hexBinary">hexBinary</a> and <a href="#base64Binary">base64Binary</a> and datatypes <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from them,
<b>minLength</b> is measured in octets (8 bits) of binary data.
For datatypes <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> by <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a>,
<b>minLength</b> is measured in number of list items.
</p><div class="note"><b>Note:&#xa0;</b>
For <a href="#string">string</a> and datatypes <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from <a href="#string">string</a>,
<b>minLength</b> will not always coincide with &quot;string length&quot; as perceived
by some users or with the number of storage units in some digital representation.
Therefore, care should be taken when specifying a value for <b>minLength</b>
and in attempting to infer storage requirements from a given value for
<b>minLength</b>.
</div><p>
<a class="termref" href="#dt-minLength"><span class="arrow">&#xb7;</span>minLength<span class="arrow">&#xb7;</span></a> provides for:
</p><ul><li>
Constraining a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
to values with at least a specific number of <em>units of length</em>,
where <em>units of length</em>
varies depending on <a class="propref" href="#defn-basetype">{base type definition}</a>.
</li></ul><div class="exampleOuter"><div class="exampleHeader">Example</div><div class="exampleWrapper">
The following is the definition of a <a class="termref" href="#dt-user-derived"><span class="arrow">&#xb7;</span>user-derived<span class="arrow">&#xb7;</span></a>
datatype which requires strings to have at least one character (i.e.,
the empty string is not in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
of this datatype).
</div><div class="exampleInner"><pre>&lt;simpleType name='non-empty-string'&gt;
  &lt;restriction base='string'&gt;
    &lt;minLength value='1'/&gt;
  &lt;/restriction&gt;
&lt;/simpleType&gt;</pre></div></div><div class="div4">
<h5><a id="dc-minLength" name="dc-minLength"/>4.3.2.1 The minLength Schema Component</h5><div class="schemaComp"><div class="compHeader"><span class="schemaComp">Schema&#xa0;Component</span>:&#xa0;<a href="#dt-minLength">minLength</a></div><div class="compBody">
<dl class="props">
<dt><a name="minLength-value" id="minLength-value"><span class="propdef">{value}</span></a></dt><dd>
A <a href="#nonNegativeInteger">nonNegativeInteger</a>.
</dd>
<dt><a name="minLength-fixed" id="minLength-fixed"><span class="propdef">{fixed}</span></a></dt><dd>
A <a href="#boolean">boolean</a>.
</dd>
<dt><a name="minLength-annotation" id="minLength-annotation"><span class="propdef">{annotation}</span></a></dt><dd>
Optional.  An <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#Annotation">annotation</a>.
</dd>
</dl>
</div></div><p>
If <a class="propref" href="#minLength-fixed">{fixed}</a> is <em>true</em>, then types for which
the current type is the <a class="propref" href="#defn-basetype">{base type definition}</a> cannot specify a
value for <a href="#dc-minLength">minLength</a> other than <a class="propref" href="#minLength-value">{value}</a>.
</p></div><div class="div4">
<h5><a id="xr-minLength" name="xr-minLength"/>4.3.2.2 XML Representation of minLength Schema Component</h5><p>
The XML representation for a <a href="#dc-minLength">minLength</a> schema
component is a <a class="eltref" href="#element-minLength">&lt;minLength&gt;</a> element information item. The
correspondences between the properties of the information item and
properties of the component are as follows:
</p><div class="reprdef"><div class="reprHeader"><span class="reprdef">XML&#xa0;Representation&#xa0;Summary</span>:&#xa0;<code>minLength</code>&#xa0;Element Information Item</div><div class="reprBody">
<p class="element-syntax-1"><a name="element-minLength" id="element-minLength">&lt;minLength</a><br/>&#xa0;&#xa0;fixed = <a href="#boolean">boolean</a>&#xa0;:&#xa0;false<br/>&#xa0;&#xa0;id = <a href="#ID">ID</a><br/>&#xa0;&#xa0;<b>value</b> = <a href="#nonNegativeInteger">nonNegativeInteger</a><br/>&#xa0;&#xa0;<em>{any attributes with non-schema namespace . . .}</em>&gt;<br/><em>&#xa0;&#xa0;Content: </em>(<a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">annotation</a>?)<br/>&lt;/minLength&gt;</p>
<div class="reprcomp"><table class="reprcomp"><thead><tr><th><a href="#dc-fractionDigits">minLength</a><strong>&#xa0;Schema Component</strong></th></tr></thead><tbody><tr><td><table cellpadding="3" border="0"><thead><tr><th align="left">Property</th><th align="left">Representation</th></tr></thead><tbody valign="top"><tr valign="top"><td><a class="propref" href="#minLength-value">{value}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the <code>value</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>
</td></tr><tr valign="top"><td><a class="propref" href="#minLength-fixed">{fixed}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the <code>fixed</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>, if present, otherwise false
</td></tr><tr valign="top"><td><a class="propref" href="#defn-annotation">{annotation}</a></td><td>
The annotations corresponding to all the <a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">&lt;annotation&gt;</a>
element information items in the <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.element">[children]</a>, if any.
</td></tr></tbody></table></td></tr></tbody></table></div>
</div></div></div><div class="div4">
<h5><a id="minLength-validation-rules" name="minLength-validation-rules"/>4.3.2.3 minLength Validation Rules</h5><div class="constraintnote"><a name="cvc-minLength-valid" id="cvc-minLength-valid"/><b>Validation Rule:  minLength Valid</b><br/><div class="constraint">
A value in a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> is facet-valid with
respect to <a class="termref" href="#dt-minLength"><span class="arrow">&#xb7;</span>minLength<span class="arrow">&#xb7;</span></a>, determined as follows:
<div class="constraintlist"><div class="clnumber">1 
if the <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a> then
<div class="constraintlist"><div class="clnumber">1.1 
if <a class="propref" href="#defn-primitive">{primitive type definition}</a> is <a href="#string">string</a> or
<a href="#anyURI">anyURI</a>, then the
length of the value, as measured in<a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#dt-character">
character</a>s
<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be greater than or equal to
<a class="propref" href="#minLength-value">{value}</a>;
</div><div class="clnumber">1.2 
if <a class="propref" href="#defn-primitive">{primitive type definition}</a> is <a href="#hexBinary">hexBinary</a> or <a href="#base64Binary">base64Binary</a>, then the
length of the value, as measured in octets of the binary data,
<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be greater than or equal to
<a class="propref" href="#minLength-value">{value}</a>;
</div><div class="clnumber">1.3 

if <a class="propref" href="#defn-primitive">{primitive type definition}</a> is <a href="#QName">QName</a> or <a href="#NOTATION">NOTATION</a>, then
any <a class="propref" href="#minLength-value">{value}</a> is facet-valid.
</div></div>
</div><div class="clnumber">2 
if the <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a>,
then the length of the value, as measured
in list items, <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be greater than or equal
to <a class="propref" href="#minLength-value">{value}</a>
</div></div></div></div><p>

The use of <a class="termref" href="#dt-minLength"><span class="arrow">&#xb7;</span>minLength<span class="arrow">&#xb7;</span></a>
on datatypes <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from <a href="#QName">QName</a> and <a href="#NOTATION">NOTATION</a>
is deprecated.  Future versions of this
specification may remove this facet for these datatypes.

</p></div><div class="div4">
<h5><a id="minLength-coss" name="minLength-coss"/>4.3.2.4 Constraints on minLength Schema Components</h5><div class="constraintnote"><a name="minLength-less-than-equal-to-maxLength" id="minLength-less-than-equal-to-maxLength"/><b>Schema Component Constraint:  minLength &lt;= maxLength</b><br/><div class="constraint">
If both <a href="#dc-minLength">minLength</a> and <a href="#dc-maxLength">maxLength</a>
are members of <a class="propref" href="#defn-facets">{facets}</a>, then the
<a class="propref" href="#minLength-value">{value}</a> of <a href="#dc-minLength">minLength</a>
&#xa0;<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be less than or equal to the
<a class="propref" href="#maxLength-value">{value}</a> of <a href="#dc-maxLength">maxLength</a>.
</div></div><div class="constraintnote"><a name="minLength-valid-restriction" id="minLength-valid-restriction"/><b>Schema Component Constraint:  minLength valid restriction</b><br/><div class="constraint">
It is an <a class="termref" href="#dt-error"><span class="arrow">&#xb7;</span>error<span class="arrow">&#xb7;</span></a> if <a href="#dc-minLength">minLength</a>
is among the members of <a class="propref" href="#defn-facets">{facets}</a> of
<a class="propref" href="#defn-basetype">{base type definition}</a> and <a class="propref" href="#minLength-value">{value}</a> is
less than the <a class="propref" href="#minLength-value">{value}</a> of the parent
<a href="#dc-minLength">minLength</a>.
</div></div></div></div><div class="div3">
<h4><a id="rf-maxLength" name="rf-maxLength"/>4.3.3 maxLength</h4><p>
<span class="termdef"><a id="dt-maxLength" name="dt-maxLength">[Definition:]&#xa0;&#xa0;</a>
<b>maxLength</b> is
the maximum number of <em>units of length</em>, where
<em>units of length</em> varies
depending on the type that is being <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from.
The value of <b>maxLength</b>
&#xa0;<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be a <a href="#nonNegativeInteger">nonNegativeInteger</a>.
</span>
</p><p>
For <a href="#string">string</a> and datatypes <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from <a href="#string">string</a>,
<b>maxLength</b> is measured in units of <a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#dt-character">
character</a>s as defined in <a href="#XML">[XML 1.0 (Second Edition)]</a>.
For <a href="#hexBinary">hexBinary</a> and <a href="#base64Binary">base64Binary</a> and datatypes <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from them,
<b>maxLength</b> is measured in octets (8 bits) of binary data.
For datatypes <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> by <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a>,
<b>maxLength</b> is measured in number of list items.
</p><div class="note"><b>Note:&#xa0;</b>
For <a href="#string">string</a> and datatypes <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from <a href="#string">string</a>,
<b>maxLength</b> will not always coincide with &quot;string length&quot; as perceived
by some users or with the number of storage units in some digital representation.
Therefore, care should be taken when specifying a value for <b>maxLength</b>
and in attempting to infer storage requirements from a given value for
<b>maxLength</b>.
</div><p>
<a class="termref" href="#dt-maxLength"><span class="arrow">&#xb7;</span>maxLength<span class="arrow">&#xb7;</span></a> provides for:
</p><ul><li>
Constraining a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
to values with at most a specific number of <em>units of length</em>,
where <em>units of length</em>
varies depending on <a class="propref" href="#defn-basetype">{base type definition}</a>.
</li></ul><div class="exampleOuter"><div class="exampleHeader">Example</div><div class="exampleWrapper">
The following is the definition of a <a class="termref" href="#dt-user-derived"><span class="arrow">&#xb7;</span>user-derived<span class="arrow">&#xb7;</span></a>
datatype which might be used to accept form input with an upper limit
to the number of characters that are acceptable.
</div><div class="exampleInner"><pre>&lt;simpleType name='form-input'&gt;
  &lt;restriction base='string'&gt;
    &lt;maxLength value='50'/&gt;
  &lt;/restriction&gt;
&lt;/simpleType&gt;</pre></div></div><div class="div4">
<h5><a id="dc-maxLength" name="dc-maxLength"/>4.3.3.1 The maxLength Schema Component</h5><div class="schemaComp"><div class="compHeader"><span class="schemaComp">Schema&#xa0;Component</span>:&#xa0;<a href="#dt-maxLength">maxLength</a></div><div class="compBody">
<dl class="props">
<dt><a name="maxLength-value" id="maxLength-value"><span class="propdef">{value}</span></a></dt><dd>
A <a href="#nonNegativeInteger">nonNegativeInteger</a>.
</dd>
<dt><a name="maxLength-fixed" id="maxLength-fixed"><span class="propdef">{fixed}</span></a></dt><dd>
A <a href="#boolean">boolean</a>.
</dd>
<dt><a name="maxLength-annotation" id="maxLength-annotation"><span class="propdef">{annotation}</span></a></dt><dd>
Optional.  An <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#Annotation">annotation</a>.
</dd>
</dl>
</div></div><p>
If <a class="propref" href="#maxLength-fixed">{fixed}</a> is <em>true</em>, then types for which
the current type is the <a class="propref" href="#defn-basetype">{base type definition}</a> cannot specify a
value for <a href="#dc-maxLength">maxLength</a> other than <a class="propref" href="#maxLength-value">{value}</a>.
</p></div><div class="div4">
<h5><a id="xr-maxLength" name="xr-maxLength"/>4.3.3.2 XML Representation of maxLength Schema Components</h5><p>
The XML representation for a <a href="#dc-maxLength">maxLength</a> schema
component is a <a class="eltref" href="#element-maxLength">&lt;maxLength&gt;</a> element information item. The
correspondences between the properties of the information item and
properties of the component are as follows:
</p><div class="reprdef"><div class="reprHeader"><span class="reprdef">XML&#xa0;Representation&#xa0;Summary</span>:&#xa0;<code>maxLength</code>&#xa0;Element Information Item</div><div class="reprBody">
<p class="element-syntax-1"><a name="element-maxLength" id="element-maxLength">&lt;maxLength</a><br/>&#xa0;&#xa0;fixed = <a href="#boolean">boolean</a>&#xa0;:&#xa0;false<br/>&#xa0;&#xa0;id = <a href="#ID">ID</a><br/>&#xa0;&#xa0;<b>value</b> = <a href="#nonNegativeInteger">nonNegativeInteger</a><br/>&#xa0;&#xa0;<em>{any attributes with non-schema namespace . . .}</em>&gt;<br/><em>&#xa0;&#xa0;Content: </em>(<a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">annotation</a>?)<br/>&lt;/maxLength&gt;</p>
<div class="reprcomp"><table class="reprcomp"><thead><tr><th><a href="#dc-fractionDigits">maxLength</a><strong>&#xa0;Schema Component</strong></th></tr></thead><tbody><tr><td><table cellpadding="3" border="0"><thead><tr><th align="left">Property</th><th align="left">Representation</th></tr></thead><tbody valign="top"><tr valign="top"><td><a class="propref" href="#maxLength-value">{value}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the <code>value</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>
</td></tr><tr valign="top"><td><a class="propref" href="#maxLength-fixed">{fixed}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the <code>fixed</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>, if present, otherwise false
</td></tr><tr valign="top"><td><a class="propref" href="#defn-annotation">{annotation}</a></td><td>
The annotations corresponding to all the <a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">&lt;annotation&gt;</a>
element information items in the <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.element">[children]</a>, if any.
</td></tr></tbody></table></td></tr></tbody></table></div>
</div></div></div><div class="div4">
<h5><a id="maxLength-validation-rules" name="maxLength-validation-rules"/>4.3.3.3 maxLength Validation Rules</h5><div class="constraintnote"><a name="cvc-maxLength-valid" id="cvc-maxLength-valid"/><b>Validation Rule:  maxLength Valid</b><br/><div class="constraint">
A value in a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> is facet-valid with
respect to <a class="termref" href="#dt-maxLength"><span class="arrow">&#xb7;</span>maxLength<span class="arrow">&#xb7;</span></a>, determined as follows:
<div class="constraintlist"><div class="clnumber">1 
if the <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a> then
<div class="constraintlist"><div class="clnumber">1.1 
if <a class="propref" href="#defn-primitive">{primitive type definition}</a> is <a href="#string">string</a> or
<a href="#anyURI">anyURI</a>, then the
length of the value, as measured in <a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#dt-character">
character</a>s
<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be less than or equal to
<a class="propref" href="#maxLength-value">{value}</a>;
</div><div class="clnumber">1.2 
if <a class="propref" href="#defn-primitive">{primitive type definition}</a> is <a href="#hexBinary">hexBinary</a> or <a href="#base64Binary">base64Binary</a>, then the
length of the value, as measured in octets of the binary data,
<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be less than or equal to <a class="propref" href="#maxLength-value">{value}</a>;
</div><div class="clnumber">1.3 

if <a class="propref" href="#defn-primitive">{primitive type definition}</a> is <a href="#QName">QName</a> or <a href="#NOTATION">NOTATION</a>, then
any <a class="propref" href="#maxLength-value">{value}</a> is facet-valid.
</div></div>
</div><div class="clnumber">2 
if the <a class="propref" href="#defn-variety">{variety}</a> is <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a>,
then the length of the value, as measured
in list items, <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be less than or equal to
<a class="propref" href="#maxLength-value">{value}</a>
</div></div></div></div><p>

The use of <a class="termref" href="#dt-maxLength"><span class="arrow">&#xb7;</span>maxLength<span class="arrow">&#xb7;</span></a>
on datatypes <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from <a href="#QName">QName</a> and <a href="#NOTATION">NOTATION</a>
is deprecated.  Future versions of this
specification may remove this facet for these datatypes.

</p></div><div class="div4">
<h5><a id="maxLength-coss" name="maxLength-coss"/>4.3.3.4 Constraints on maxLength Schema Components</h5><div class="constraintnote"><a name="maxLength-valid-restriction" id="maxLength-valid-restriction"/><b>Schema Component Constraint:  maxLength valid restriction</b><br/><div class="constraint">
It is an <a class="termref" href="#dt-error"><span class="arrow">&#xb7;</span>error<span class="arrow">&#xb7;</span></a> if <a href="#dc-maxLength">maxLength</a>
is among the members of <a class="propref" href="#defn-facets">{facets}</a> of
<a class="propref" href="#defn-basetype">{base type definition}</a> and <a class="propref" href="#maxLength-value">{value}</a> is
greater than the <a class="propref" href="#maxLength-value">{value}</a> of the parent
<a href="#dc-maxLength">maxLength</a>.
</div></div></div></div><div class="div3">
<h4><a id="rf-pattern" name="rf-pattern"/>4.3.4 pattern</h4><p>
<span class="termdef"><a id="dt-pattern" name="dt-pattern">[Definition:]&#xa0;&#xa0;</a>
<b>pattern</b> is a constraint on the
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of a datatype which is achieved by
constraining the <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> to literals
which match a specific pattern.  The value of <b>pattern</b>
&#xa0;<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be a <a class="termref" href="#dt-regex"><span class="arrow">&#xb7;</span>regular expression<span class="arrow">&#xb7;</span></a>.
</span>
</p><p>
<a class="termref" href="#dt-pattern"><span class="arrow">&#xb7;</span>pattern<span class="arrow">&#xb7;</span></a> provides for:
</p><ul><li>
Constraining a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
to values that are denoted by literals which match a specific
<a class="termref" href="#dt-regex"><span class="arrow">&#xb7;</span>regular expression<span class="arrow">&#xb7;</span></a>.
</li></ul><div class="exampleOuter"><div class="exampleHeader">Example</div><div class="exampleWrapper">
The following is the definition of a <a class="termref" href="#dt-user-derived"><span class="arrow">&#xb7;</span>user-derived<span class="arrow">&#xb7;</span></a>
datatype which is a better representation of postal codes in the
United States, by limiting strings to those which are matched by
a specific <a class="termref" href="#dt-regex"><span class="arrow">&#xb7;</span>regular expression<span class="arrow">&#xb7;</span></a>.
</div><div class="exampleInner"><pre>&lt;simpleType name='better-us-zipcode'&gt;
  &lt;restriction base='string'&gt;
    &lt;pattern value='[0-9]{5}(-[0-9]{4})?'/&gt;
  &lt;/restriction&gt;
&lt;/simpleType&gt;</pre></div></div><div class="div4">
<h5><a id="dc-pattern" name="dc-pattern"/>4.3.4.1 The pattern Schema Component</h5><div class="schemaComp"><div class="compHeader"><span class="schemaComp">Schema&#xa0;Component</span>:&#xa0;<a href="#dt-pattern">pattern</a></div><div class="compBody">
<dl class="props">
<dt><a name="pattern-value" id="pattern-value"><span class="propdef">{value}</span></a></dt><dd>
A <a class="termref" href="#dt-regex"><span class="arrow">&#xb7;</span>regular expression<span class="arrow">&#xb7;</span></a>.
</dd>
<dt><a name="pattern-annotation" id="pattern-annotation"><span class="propdef">{annotation}</span></a></dt><dd>
Optional.  An <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#Annotation">annotation</a>.
</dd>
</dl>
</div></div></div><div class="div4">
<h5><a id="xr-pattern" name="xr-pattern"/>4.3.4.2 XML Representation of pattern Schema Components</h5><p>
The XML representation for a <a href="#dc-pattern">pattern</a> schema
component is a <a class="eltref" href="#element-pattern">&lt;pattern&gt;</a> element information item. The
correspondences between the properties of the information item and
properties of the component are as follows:
</p><div class="reprdef"><div class="reprHeader"><span class="reprdef">XML&#xa0;Representation&#xa0;Summary</span>:&#xa0;<code>pattern</code>&#xa0;Element Information Item</div><div class="reprBody">
<p class="element-syntax-1"><a name="element-pattern" id="element-pattern">&lt;pattern</a><br/>&#xa0;&#xa0;id = <a href="#ID">ID</a><br/>&#xa0;&#xa0;<b>value</b> = <a href="#string">string</a><br/>&#xa0;&#xa0;<em>{any attributes with non-schema namespace . . .}</em>&gt;<br/><em>&#xa0;&#xa0;Content: </em>(<a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">annotation</a>?)<br/>&lt;/pattern&gt;</p>
<div class="reprdep">
<a class="propref" href="#pattern-value">{value}</a>&#xa0;<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be a valid
<a class="termref" href="#dt-regex"><span class="arrow">&#xb7;</span>regular expression<span class="arrow">&#xb7;</span></a>.
</div><div class="reprcomp"><table class="reprcomp"><thead><tr><th><a href="#dc-fractionDigits">pattern</a><strong>&#xa0;Schema Component</strong></th></tr></thead><tbody><tr><td><table cellpadding="3" border="0"><thead><tr><th align="left">Property</th><th align="left">Representation</th></tr></thead><tbody valign="top"><tr valign="top"><td><a class="propref" href="#pattern-value">{value}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the <code>value</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>
</td></tr><tr valign="top"><td><a class="propref" href="#defn-annotation">{annotation}</a></td><td>
The annotations corresponding to all the <a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">&lt;annotation&gt;</a>
element information items in the <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.element">[children]</a>, if any.
</td></tr></tbody></table></td></tr></tbody></table></div>
</div></div></div><div class="div4">
<h5><a id="pattern-rep-constr" name="pattern-rep-constr"/>4.3.4.3 Constraints on XML Representation of pattern</h5><div class="constraintnote"><a name="src-multiple-patterns" id="src-multiple-patterns"/><b>Schema Representation Constraint:  Multiple patterns</b><br/><div class="constraint">
If multiple <a class="eltref" href="#element-pattern">&lt;pattern&gt;</a> element information items appear as
<a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.element">[children]</a> of a <a class="eltref" href="#element-simpleType">&lt;simpleType&gt;</a>, the <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[value]</a>s should
be combined as if they appeared in a single
<a class="termref" href="#dt-regex"><span class="arrow">&#xb7;</span>regular expression<span class="arrow">&#xb7;</span></a> as separate
<a class="termref" href="#dt-branch"><span class="arrow">&#xb7;</span>branch<span class="arrow">&#xb7;</span></a>es.
</div></div><div class="note"><b>Note:&#xa0;</b>
It is a consequence of the schema representation constraint
<a href="#src-multiple-patterns">Multiple patterns (&#xa7;4.3.4.3)</a> and of the rules for
<a class="termref" href="#dt-restriction"><span class="arrow">&#xb7;</span>restriction<span class="arrow">&#xb7;</span></a> that <a class="termref" href="#dt-pattern"><span class="arrow">&#xb7;</span>pattern<span class="arrow">&#xb7;</span></a>
facets specified on the <em>same</em> step in a type
derivation are <b>OR</b>ed together, while <a class="termref" href="#dt-pattern"><span class="arrow">&#xb7;</span>pattern<span class="arrow">&#xb7;</span></a>
facets specified on <em>different</em> steps of a type derivation
are <b>AND</b>ed together.
<p/>
Thus, to impose two <a class="termref" href="#dt-pattern"><span class="arrow">&#xb7;</span>pattern<span class="arrow">&#xb7;</span></a> constraints simultaneously,
schema authors may either write a single <a class="termref" href="#dt-pattern"><span class="arrow">&#xb7;</span>pattern<span class="arrow">&#xb7;</span></a> which
expresses the intersection of the two <a class="termref" href="#dt-pattern"><span class="arrow">&#xb7;</span>pattern<span class="arrow">&#xb7;</span></a>s they wish to
impose, or define each <a class="termref" href="#dt-pattern"><span class="arrow">&#xb7;</span>pattern<span class="arrow">&#xb7;</span></a> on a separate type derivation
step.
</div></div><div class="div4">
<h5><a id="pattern-validation-rules" name="pattern-validation-rules"/>4.3.4.4 pattern Validation Rules</h5><div class="constraintnote"><a name="cvc-pattern-valid" id="cvc-pattern-valid"/><b>Validation Rule:  pattern valid</b><br/><div class="constraint">
A literal in a <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> is facet-valid with
respect to <a class="termref" href="#dt-pattern"><span class="arrow">&#xb7;</span>pattern<span class="arrow">&#xb7;</span></a> if:
<div class="constraintlist"><div class="clnumber">1 
the literal is among the set of character sequences denoted by
the <a class="termref" href="#dt-regex"><span class="arrow">&#xb7;</span>regular expression<span class="arrow">&#xb7;</span></a> specified in <a class="propref" href="#pattern-value">{value}</a>.
</div></div></div></div></div></div><div class="div3">
<h4><a id="rf-enumeration" name="rf-enumeration"/>4.3.5 enumeration</h4><p>
<span class="termdef"><a id="dt-enumeration" name="dt-enumeration">[Definition:]&#xa0;&#xa0;</a>
<b>enumeration</b> constrains the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
to a specified set of values.
</span>
</p><p>
<b>enumeration</b> does not impose an order relation on the
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> it creates; the value of the
<a class="termref" href="#dt-ordered"><span class="arrow">&#xb7;</span>ordered<span class="arrow">&#xb7;</span></a> property of the <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>
datatype remains that of the datatype from which it is
<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>.
</p><p>
<a class="termref" href="#dt-enumeration"><span class="arrow">&#xb7;</span>enumeration<span class="arrow">&#xb7;</span></a> provides for:
</p><ul><li>
Constraining a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
to a specified set of values.
</li></ul><div class="exampleOuter"><div class="exampleHeader">Example</div><div class="exampleWrapper">
The following example is a datatype definition for a
<a class="termref" href="#dt-user-derived"><span class="arrow">&#xb7;</span>user-derived<span class="arrow">&#xb7;</span></a> datatype which limits the values
of dates to the three US holidays enumerated. This datatype
definition would appear in a schema authored by an &quot;end-user&quot; and
shows how to define a datatype by enumerating the values in its
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>.  The enumerated values must be
type-valid literals for the <a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a>.
</div><div class="exampleInner"><pre>&lt;simpleType name='holidays'&gt;
    &lt;annotation&gt;
        &lt;documentation&gt;some US holidays&lt;/documentation&gt;
    &lt;/annotation&gt;
    &lt;restriction base='gMonthDay'&gt;
      &lt;enumeration value='--01-01'&gt;
        &lt;annotation&gt;
            &lt;documentation&gt;New Year's day&lt;/documentation&gt;
        &lt;/annotation&gt;
      &lt;/enumeration&gt;
      &lt;enumeration value='--07-04'&gt;
        &lt;annotation&gt;
            &lt;documentation&gt;4th of July&lt;/documentation&gt;
        &lt;/annotation&gt;
      &lt;/enumeration&gt;
      &lt;enumeration value='--12-25'&gt;
        &lt;annotation&gt;
            &lt;documentation&gt;Christmas&lt;/documentation&gt;
        &lt;/annotation&gt;
      &lt;/enumeration&gt;
    &lt;/restriction&gt;
&lt;/simpleType&gt;</pre></div></div><div class="div4">
<h5><a id="dc-enumeration" name="dc-enumeration"/>4.3.5.1 The enumeration Schema Component</h5><div class="schemaComp"><div class="compHeader"><span class="schemaComp">Schema&#xa0;Component</span>:&#xa0;<a href="#dt-enumeration">enumeration</a></div><div class="compBody">
<dl class="props">
<dt><a name="enumeration-value" id="enumeration-value"><span class="propdef">{value}</span></a></dt><dd>
A set of values from the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of the
<a class="propref" href="#defn-basetype">{base type definition}</a>.
</dd>
<dt><a name="enumeration-annotation" id="enumeration-annotation"><span class="propdef">{annotation}</span></a></dt><dd>
Optional.  An <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#Annotation">annotation</a>.
</dd>
</dl>
</div></div></div><div class="div4">
<h5><a id="xr-enumeration" name="xr-enumeration"/>4.3.5.2 XML Representation of enumeration Schema Components</h5><p>
The XML representation for an <a href="#dc-enumeration">enumeration</a> schema
component is an <a class="eltref" href="#element-enumeration">&lt;enumeration&gt;</a> element information item. The
correspondences between the properties of the information item and
properties of the component are as follows:
</p><div class="reprdef"><div class="reprHeader"><span class="reprdef">XML&#xa0;Representation&#xa0;Summary</span>:&#xa0;<code>enumeration</code>&#xa0;Element Information Item</div><div class="reprBody">
<p class="element-syntax-1"><a name="element-enumeration" id="element-enumeration">&lt;enumeration</a><br/>&#xa0;&#xa0;id = <a href="#ID">ID</a><br/>&#xa0;&#xa0;<b>value</b> = <a href="#dt-anySimpleType">anySimpleType</a><br/>&#xa0;&#xa0;<em>{any attributes with non-schema namespace . . .}</em>&gt;<br/><em>&#xa0;&#xa0;Content: </em>(<a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">annotation</a>?)<br/>&lt;/enumeration&gt;</p>
<div class="reprdep">
<a class="propref" href="#enumeration-value">{value}</a>&#xa0;<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be
in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <a class="propref" href="#defn-basetype">{base type definition}</a>.
</div><div class="reprcomp"><table class="reprcomp"><thead><tr><th><a href="#dc-enumeration">enumeration</a><strong>&#xa0;Schema Component</strong></th></tr></thead><tbody><tr><td><table cellpadding="3" border="0"><thead><tr><th align="left">Property</th><th align="left">Representation</th></tr></thead><tbody valign="top"><tr valign="top"><td><a class="propref" href="#enumeration-value">{value}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the <code>value</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>
</td></tr><tr valign="top"><td><a class="propref" href="#defn-annotation">{annotation}</a></td><td>
The annotations corresponding to all the <a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">&lt;annotation&gt;</a>
element information items in the <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.element">[children]</a>, if any.
</td></tr></tbody></table></td></tr></tbody></table></div>
</div></div></div><div class="div4">
<h5><a id="enumeration-rep-constr" name="enumeration-rep-constr"/>4.3.5.3 Constraints on XML Representation of enumeration</h5><div class="constraintnote"><a name="src-multiple-enumerations" id="src-multiple-enumerations"/><b>Schema Representation Constraint:  Multiple enumerations</b><br/><div class="constraint">
If multiple <a class="eltref" href="#element-enumeration">&lt;enumeration&gt;</a> element information items appear
as <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.element">[children]</a> of a <a class="eltref" href="#element-simpleType">&lt;simpleType&gt;</a> the
<a class="propref" href="#enumeration-value">{value}</a> of the <a href="#dc-enumeration">enumeration</a>
component should be the set of all such <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[value]</a>s.
</div></div></div><div class="div4">
<h5><a id="enumeration-validation-rules" name="enumeration-validation-rules"/>4.3.5.4 enumeration Validation Rules</h5><div class="constraintnote"><a name="cvc-enumeration-valid" id="cvc-enumeration-valid"/><b>Validation Rule:  enumeration valid</b><br/><div class="constraint">
A value in a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> is facet-valid with
respect to <a class="termref" href="#dt-enumeration"><span class="arrow">&#xb7;</span>enumeration<span class="arrow">&#xb7;</span></a> if
the value is one of the values specified in
<a class="propref" href="#enumeration-value">{value}</a>
</div></div></div><div class="div4">
<h5><a id="enumeration-coss" name="enumeration-coss"/>4.3.5.5 Constraints on enumeration Schema Components</h5><div class="constraintnote"><a name="enumeration-valid-restriction" id="enumeration-valid-restriction"/><b>Schema Component Constraint:  enumeration valid restriction</b><br/><div class="constraint">
It is an <a class="termref" href="#dt-error"><span class="arrow">&#xb7;</span>error<span class="arrow">&#xb7;</span></a> if any member of <a class="propref" href="#enumeration-value">{value}</a> is not in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
of <a class="propref" href="#defn-basetype">{base type definition}</a>.
</div></div></div></div><div class="div3">
<h4><a id="rf-whiteSpace" name="rf-whiteSpace"/>4.3.6 whiteSpace</h4><p>
<span class="termdef"><a id="dt-whiteSpace" name="dt-whiteSpace">[Definition:]&#xa0;&#xa0;</a>
<b>whiteSpace</b> constrains the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
of types <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from <a href="#string">string</a> such that
the various behaviors
specified in <a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#AVNormalize">Attribute Value Normalization</a>
in <a href="#XML">[XML 1.0 (Second Edition)]</a> are realized.  The value of
<b>whiteSpace</b> must be one of {preserve, replace, collapse}.
</span>
</p><dl><dt class="label">preserve</dt><dd>
No normalization is done, the value is not changed (this is the
behavior required  by <a href="#XML">[XML 1.0 (Second Edition)]</a> for element content)
</dd><dt class="label">replace</dt><dd>
All occurrences of #x9 (tab), #xA (line feed) and #xD (carriage return)
are replaced with #x20 (space)
</dd><dt class="label">collapse</dt><dd>
After the processing implied by <b>replace</b>, contiguous
sequences of #x20's are collapsed to a single #x20, and leading and
trailing #x20's are removed.
</dd></dl><div class="note"><b>Note:&#xa0;</b>
The notation #xA used here (and elsewhere in this specification) represents
the Universal Character Set (UCS) code point <code>hexadecimal A</code> (line feed), which is denoted by
U+000A.  This notation is to be distinguished from <code>&amp;#xA;</code>,
which is the XML <a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#NT-CharRef">character reference</a>
to that same UCS code point.
</div><p>
<b>whiteSpace</b> is applicable to all <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a> and
<a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> datatypes.  For all <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a>
datatypes other than <a href="#string">string</a> (and types <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>
by <a class="termref" href="#dt-restriction"><span class="arrow">&#xb7;</span>restriction<span class="arrow">&#xb7;</span></a> from it) the value of <b>whiteSpace</b> is
<code>collapse</code> and cannot be changed by a schema author; for
<a href="#string">string</a> the value of <b>whiteSpace</b> is
<code>preserve</code>; for any type <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> by
<a class="termref" href="#dt-restriction"><span class="arrow">&#xb7;</span>restriction<span class="arrow">&#xb7;</span></a> from
<a href="#string">string</a> the value of <b>whiteSpace</b> can
be any of the three legal values.  For all datatypes
<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> by <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> the
value of <b>whiteSpace</b> is <code>collapse</code> and cannot
be changed by a schema author.  For all datatypes
<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> by <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a>
&#xa0;<b>whiteSpace</b> does not apply directly; however, the
normalization behavior of <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a> types is controlled by
the value of <b>whiteSpace</b> on that one of the
<a class="termref" href="#dt-memberTypes"><span class="arrow">&#xb7;</span>memberTypes<span class="arrow">&#xb7;</span></a> against which the <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a>
is successfully validated.
</p><div class="note"><b>Note:&#xa0;</b>
For more information on <b>whiteSpace</b>, see the
discussion on white space normalization in
<a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#components">Schema Component Details</a>
in <a href="#structural-schemas">[XML Schema Part 1: Structures]</a>.
</div><p>
<a class="termref" href="#dt-whiteSpace"><span class="arrow">&#xb7;</span>whiteSpace<span class="arrow">&#xb7;</span></a> provides for:
</p><ul><li>
Constraining a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> according to
the white space normalization rules.
</li></ul><div class="exampleOuter"><div class="exampleHeader">Example</div><div class="exampleWrapper">
The following example is the datatype definition for
the <a href="#token">token</a>&#xa0;<a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a>&#xa0;
<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>
datatype.
</div><div class="exampleInner"><pre>&lt;simpleType name='token'&gt;
    &lt;restriction base='normalizedString'&gt;
      &lt;whiteSpace value='collapse'/&gt;
    &lt;/restriction&gt;
&lt;/simpleType&gt;</pre></div></div><div class="div4">
<h5><a id="dc-whiteSpace" name="dc-whiteSpace"/>4.3.6.1 The whiteSpace Schema Component</h5><div class="schemaComp"><div class="compHeader"><span class="schemaComp">Schema&#xa0;Component</span>:&#xa0;<a href="#dt-whiteSpace">whiteSpace</a></div><div class="compBody">
<dl class="props">
<dt><a name="whiteSpace-value" id="whiteSpace-value"><span class="propdef">{value}</span></a></dt><dd>
One of <code>{preserve, replace, collapse}</code>.
</dd>
<dt><a name="whiteSpace-fixed" id="whiteSpace-fixed"><span class="propdef">{fixed}</span></a></dt><dd>
A <a href="#boolean">boolean</a>.
</dd>
<dt><a name="whiteSpace-annotation" id="whiteSpace-annotation"><span class="propdef">{annotation}</span></a></dt><dd>
Optional.  An <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#Annotation">annotation</a>.
</dd>
</dl>
</div></div><p>
If <a class="propref" href="#whiteSpace-fixed">{fixed}</a> is <em>true</em>, then types for which
the current type is the <a class="propref" href="#defn-basetype">{base type definition}</a> cannot specify a
value for <a href="#dc-whiteSpace">whiteSpace</a> other than <a class="propref" href="#whiteSpace-value">{value}</a>.
</p></div><div class="div4">
<h5><a id="xr-whiteSpace" name="xr-whiteSpace"/>4.3.6.2 XML Representation of whiteSpace Schema Components</h5><p>
The XML representation for a <a href="#dc-whiteSpace">whiteSpace</a> schema
component is a <a class="eltref" href="#element-whiteSpace">&lt;whiteSpace&gt;</a> element information item. The
correspondences between the properties of the information item and
properties of the component are as follows:
</p><div class="reprdef"><div class="reprHeader"><span class="reprdef">XML&#xa0;Representation&#xa0;Summary</span>:&#xa0;<code>whiteSpace</code>&#xa0;Element Information Item</div><div class="reprBody">
<p class="element-syntax-1"><a name="element-whiteSpace" id="element-whiteSpace">&lt;whiteSpace</a><br/>&#xa0;&#xa0;fixed = <a href="#boolean">boolean</a>&#xa0;:&#xa0;false<br/>&#xa0;&#xa0;id = <a href="#ID">ID</a><br/>&#xa0;&#xa0;<b>value</b> = (<var>collapse</var> | <var>preserve</var> | <var>replace</var>)<br/>&#xa0;&#xa0;<em>{any attributes with non-schema namespace . . .}</em>&gt;<br/><em>&#xa0;&#xa0;Content: </em>(<a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">annotation</a>?)<br/>&lt;/whiteSpace&gt;</p>
<div class="reprcomp"><table class="reprcomp"><thead><tr><th><a href="#dc-whiteSpace">whiteSpace</a><strong>&#xa0;Schema Component</strong></th></tr></thead><tbody><tr><td><table cellpadding="3" border="0"><thead><tr><th align="left">Property</th><th align="left">Representation</th></tr></thead><tbody valign="top"><tr valign="top"><td><a class="propref" href="#whiteSpace-value">{value}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the <code>value</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>
</td></tr><tr valign="top"><td><a class="propref" href="#whiteSpace-fixed">{fixed}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the <code>fixed</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>, if present, otherwise false
</td></tr><tr valign="top"><td><a class="propref" href="#defn-annotation">{annotation}</a></td><td>
The annotations corresponding to all the <a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">&lt;annotation&gt;</a>
element information items in the <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.element">[children]</a>, if any.
</td></tr></tbody></table></td></tr></tbody></table></div>
</div></div></div><div class="div4">
<h5><a id="whiteSpace-validation-rules" name="whiteSpace-validation-rules"/>4.3.6.3 whiteSpace Validation Rules</h5><div class="note"><b>Note:&#xa0;</b>
There are no <a class="termref" href="#dt-cvc"><span class="arrow">&#xb7;</span>Validation Rule<span class="arrow">&#xb7;</span></a>s associated <a class="termref" href="#dt-whiteSpace"><span class="arrow">&#xb7;</span>whiteSpace<span class="arrow">&#xb7;</span></a>.
For more information, see the
discussion on white space normalization in
<a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#components">Schema Component Details</a>
in <a href="#structural-schemas">[XML Schema Part 1: Structures]</a>.
</div></div><div class="div4">
<h5><a id="whiteSpace-coss" name="whiteSpace-coss"/>4.3.6.4 Constraints on whiteSpace Schema Components</h5><div class="constraintnote"><a name="whiteSpace-valid-restriction" id="whiteSpace-valid-restriction"/><b>Schema Component Constraint:  whiteSpace valid restriction</b><br/><div class="constraint">
It is an <a class="termref" href="#dt-error"><span class="arrow">&#xb7;</span>error<span class="arrow">&#xb7;</span></a> if <a href="#dc-whiteSpace">whiteSpace</a>
is among the members of <a class="propref" href="#defn-facets">{facets}</a> of
<a class="propref" href="#defn-basetype">{base type definition}</a> and any of the following conditions is
true:
<div class="constraintlist"><div class="clnumber">1 
<a class="propref" href="#whiteSpace-value">{value}</a> is <em>replace</em> or <em>preserve</em>
and the <a class="propref" href="#whiteSpace-value">{value}</a> of the parent
<a href="#dc-whiteSpace">whiteSpace</a> is <em>collapse</em>
</div><div class="clnumber">2 
<a class="propref" href="#whiteSpace-value">{value}</a> is <em>preserve</em>
and the <a class="propref" href="#whiteSpace-value">{value}</a> of the parent
<a href="#dc-whiteSpace">whiteSpace</a> is <em>replace</em>
</div></div></div></div></div></div><div class="div3">
<h4><a id="rf-maxInclusive" name="rf-maxInclusive"/>4.3.7 maxInclusive</h4><p>
<span class="termdef"><a id="dt-maxInclusive" name="dt-maxInclusive">[Definition:]&#xa0;&#xa0;</a>
<b>maxInclusive</b> is the <a class="termref" href="#dt-inclusive-upper-bound"><span class="arrow">&#xb7;</span>inclusive upper bound<span class="arrow">&#xb7;</span></a>
of the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> for a datatype with the
<a class="termref" href="#dt-ordered"><span class="arrow">&#xb7;</span>ordered<span class="arrow">&#xb7;</span></a> property.  The value of
<b>maxInclusive</b>&#xa0;<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be
in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of the
<a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a>.
</span>
</p><p>
<a class="termref" href="#dt-maxInclusive"><span class="arrow">&#xb7;</span>maxInclusive<span class="arrow">&#xb7;</span></a> provides for:
</p><ul><li>
Constraining a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> to values
with a specific <a class="termref" href="#dt-inclusive-upper-bound"><span class="arrow">&#xb7;</span>inclusive upper bound<span class="arrow">&#xb7;</span></a>.
</li></ul><div class="exampleOuter"><div class="exampleHeader">Example</div><div class="exampleWrapper">
The following is the definition of a <a class="termref" href="#dt-user-derived"><span class="arrow">&#xb7;</span>user-derived<span class="arrow">&#xb7;</span></a>
datatype which limits values to integers less than or equal to
100, using <a class="termref" href="#dt-maxInclusive"><span class="arrow">&#xb7;</span>maxInclusive<span class="arrow">&#xb7;</span></a>.
</div><div class="exampleInner"><pre>&lt;simpleType name='one-hundred-or-less'&gt;
  &lt;restriction base='integer'&gt;
    &lt;maxInclusive value='100'/&gt;
  &lt;/restriction&gt;
&lt;/simpleType&gt;</pre></div></div><div class="div4">
<h5><a id="dc-maxInclusive" name="dc-maxInclusive"/>4.3.7.1 The maxInclusive Schema Component</h5><div class="schemaComp"><div class="compHeader"><span class="schemaComp">Schema&#xa0;Component</span>:&#xa0;<a href="#dt-maxInclusive">maxInclusive</a></div><div class="compBody">
<dl class="props">
<dt><a name="maxInclusive-value" id="maxInclusive-value"><span class="propdef">{value}</span></a></dt><dd>
A value from the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of the
<a class="propref" href="#defn-basetype">{base type definition}</a>.
</dd>
<dt><a name="maxInclusive-fixed" id="maxInclusive-fixed"><span class="propdef">{fixed}</span></a></dt><dd>
A <a href="#boolean">boolean</a>.
</dd>
<dt><a name="maxInclusive-annotation" id="maxInclusive-annotation"><span class="propdef">{annotation}</span></a></dt><dd>
Optional.  An <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#Annotation">annotation</a>.
</dd>
</dl>
</div></div><p>
If <a class="propref" href="#maxInclusive-fixed">{fixed}</a> is <em>true</em>, then types for which
the current type is the <a class="propref" href="#defn-basetype">{base type definition}</a> cannot specify a
value for <a href="#dc-maxInclusive">maxInclusive</a> other than <a class="propref" href="#maxInclusive-value">{value}</a>.
</p></div><div class="div4">
<h5><a id="xr-maxInclusive" name="xr-maxInclusive"/>4.3.7.2 XML Representation of maxInclusive Schema Components</h5><p>
The XML representation for a <a href="#dc-maxInclusive">maxInclusive</a> schema
component is a <a class="eltref" href="#element-maxInclusive">&lt;maxInclusive&gt;</a> element information item. The
correspondences between the properties of the information item and
properties of the component are as follows:
</p><div class="reprdef"><div class="reprHeader"><span class="reprdef">XML&#xa0;Representation&#xa0;Summary</span>:&#xa0;<code>maxInclusive</code>&#xa0;Element Information Item</div><div class="reprBody">
<p class="element-syntax-1"><a name="element-maxInclusive" id="element-maxInclusive">&lt;maxInclusive</a><br/>&#xa0;&#xa0;fixed = <a href="#boolean">boolean</a>&#xa0;:&#xa0;false<br/>&#xa0;&#xa0;id = <a href="#ID">ID</a><br/>&#xa0;&#xa0;<b>value</b> = <a href="#dt-anySimpleType">anySimpleType</a><br/>&#xa0;&#xa0;<em>{any attributes with non-schema namespace . . .}</em>&gt;<br/><em>&#xa0;&#xa0;Content: </em>(<a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">annotation</a>?)<br/>&lt;/maxInclusive&gt;</p>
<div class="reprdep">
<a class="propref" href="#maxInclusive-value">{value}</a>&#xa0;<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be
in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <a class="propref" href="#defn-basetype">{base type definition}</a>.
</div><div class="reprcomp"><table class="reprcomp"><thead><tr><th><a href="#dt-maxInclusive">maxInclusive</a><strong>&#xa0;Schema Component</strong></th></tr></thead><tbody><tr><td><table cellpadding="3" border="0"><thead><tr><th align="left">Property</th><th align="left">Representation</th></tr></thead><tbody valign="top"><tr valign="top"><td><a class="propref" href="#maxInclusive-value">{value}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the <code>value</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>
</td></tr><tr valign="top"><td><a class="propref" href="#maxInclusive-fixed">{fixed}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the <code>fixed</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>, if present, otherwise false, if present, otherwise false
</td></tr><tr valign="top"><td><a class="propref" href="#defn-annotation">{annotation}</a></td><td>
The annotations corresponding to all the <a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">&lt;annotation&gt;</a>
element information items in the <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.element">[children]</a>, if any.
</td></tr></tbody></table></td></tr></tbody></table></div>
</div></div></div><div class="div4">
<h5><a id="maxInclusive-validation-rules" name="maxInclusive-validation-rules"/>4.3.7.3 maxInclusive Validation Rules</h5><div class="constraintnote"><a name="cvc-maxInclusive-valid" id="cvc-maxInclusive-valid"/><b>Validation Rule:  maxInclusive Valid</b><br/><div class="constraint">
A value in an <a class="termref" href="#dt-ordered"><span class="arrow">&#xb7;</span>ordered<span class="arrow">&#xb7;</span></a>&#xa0;<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
is facet-valid with respect to <a class="termref" href="#dt-maxInclusive"><span class="arrow">&#xb7;</span>maxInclusive<span class="arrow">&#xb7;</span></a>, determined as
follows:
<div class="constraintlist"><div class="clnumber">1 
if the <a class="termref" href="#dt-numeric"><span class="arrow">&#xb7;</span>numeric<span class="arrow">&#xb7;</span></a> property in
<a class="propref" href="#defn-fund-facets">{fundamental facets}</a> is <em>true</em>, then the value
<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be numerically less than or
equal to <a class="propref" href="#maxInclusive-value">{value}</a>;
</div><div class="clnumber">2 
if the <a class="termref" href="#dt-numeric"><span class="arrow">&#xb7;</span>numeric<span class="arrow">&#xb7;</span></a> property in
<a class="propref" href="#defn-fund-facets">{fundamental facets}</a> is <em>false</em> (i.e.,
<a class="propref" href="#defn-basetype">{base type definition}</a> is one of the date and time related
datatypes), then the value <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be chronologically
less than or equal to <a class="propref" href="#maxInclusive-value">{value}</a>;
</div></div></div></div></div><div class="div4">
<h5><a id="maxInclusive-coss" name="maxInclusive-coss"/>4.3.7.4 Constraints on maxInclusive Schema Components</h5><div class="constraintnote"><a name="minInclusive-less-than-equal-to-maxInclusive" id="minInclusive-less-than-equal-to-maxInclusive"/><b>Schema Component Constraint:  minInclusive &lt;= maxInclusive</b><br/><div class="constraint">
It is an <a class="termref" href="#dt-error"><span class="arrow">&#xb7;</span>error<span class="arrow">&#xb7;</span></a> for the value specified for
<a class="termref" href="#dt-minInclusive"><span class="arrow">&#xb7;</span>minInclusive<span class="arrow">&#xb7;</span></a> to be greater than the value
specified for <a class="termref" href="#dt-maxInclusive"><span class="arrow">&#xb7;</span>maxInclusive<span class="arrow">&#xb7;</span></a> for the same datatype.
</div></div><div class="constraintnote"><a name="maxInclusive-valid-restriction" id="maxInclusive-valid-restriction"/><b>Schema Component Constraint:  maxInclusive valid restriction</b><br/><div class="constraint">
It is an <a class="termref" href="#dt-error"><span class="arrow">&#xb7;</span>error<span class="arrow">&#xb7;</span></a> if any of the following conditions
is true:
<div class="constraintlist"><div class="clnumber">1 
<a href="#dc-maxInclusive">maxInclusive</a> is among the members of
<a class="propref" href="#defn-facets">{facets}</a> of <a class="propref" href="#defn-basetype">{base type definition}</a>
and <a class="propref" href="#maxInclusive-value">{value}</a> is
greater than the <a class="propref" href="#maxInclusive-value">{value}</a> of the parent
<a href="#dc-maxInclusive">maxInclusive</a>
</div><div class="clnumber">2 
<a href="#dc-maxExclusive">maxExclusive</a> is among the members of
<a class="propref" href="#defn-facets">{facets}</a> of <a class="propref" href="#defn-basetype">{base type definition}</a>
and <a class="propref" href="#maxInclusive-value">{value}</a> is
greater than or equal to the <a class="propref" href="#maxExclusive-value">{value}</a> of the parent
<a href="#dc-maxExclusive">maxExclusive</a>
</div><div class="clnumber">3 
<a href="#dc-minInclusive">minInclusive</a> is among the members of
<a class="propref" href="#defn-facets">{facets}</a> of <a class="propref" href="#defn-basetype">{base type definition}</a>
and <a class="propref" href="#maxInclusive-value">{value}</a> is
less than the <a class="propref" href="#minInclusive-value">{value}</a> of the parent
<a href="#dc-minInclusive">minInclusive</a>
</div><div class="clnumber">4 
<a href="#dc-minExclusive">minExclusive</a> is among the members of
<a class="propref" href="#defn-facets">{facets}</a> of <a class="propref" href="#defn-basetype">{base type definition}</a>
and <a class="propref" href="#maxInclusive-value">{value}</a> is
less than or equal to the <a class="propref" href="#minExclusive-value">{value}</a> of the parent
<a href="#dc-minExclusive">minExclusive</a>
</div></div></div></div></div></div><div class="div3">
<h4><a id="rf-maxExclusive" name="rf-maxExclusive"/>4.3.8 maxExclusive</h4><p>
<span class="termdef"><a id="dt-maxExclusive" name="dt-maxExclusive">[Definition:]&#xa0;&#xa0;</a>
<b>maxExclusive</b> is the <a class="termref" href="#dt-exclusive-upper-bound"><span class="arrow">&#xb7;</span>exclusive upper bound<span class="arrow">&#xb7;</span></a>
of the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> for a datatype with the
<a class="termref" href="#dt-ordered"><span class="arrow">&#xb7;</span>ordered<span class="arrow">&#xb7;</span></a> property.  The value of <b>maxExclusive</b>
&#xa0;<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of the
<a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a> or be equal to <a class="propref" href="#maxExclusive-value">{value}</a> in
<a class="propref" href="#defn-basetype">{base type definition}</a>.
</span>
</p><p>
<a class="termref" href="#dt-maxExclusive"><span class="arrow">&#xb7;</span>maxExclusive<span class="arrow">&#xb7;</span></a> provides for:
</p><ul><li>
Constraining a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> to values
with a specific <a class="termref" href="#dt-exclusive-upper-bound"><span class="arrow">&#xb7;</span>exclusive upper bound<span class="arrow">&#xb7;</span></a>.
</li></ul><div class="exampleOuter"><div class="exampleHeader">Example</div><div class="exampleWrapper">
The following is the definition of a <a class="termref" href="#dt-user-derived"><span class="arrow">&#xb7;</span>user-derived<span class="arrow">&#xb7;</span></a>
datatype which limits values to integers less than or equal to
100, using <a class="termref" href="#dt-maxExclusive"><span class="arrow">&#xb7;</span>maxExclusive<span class="arrow">&#xb7;</span></a>.
</div><div class="exampleInner"><pre>&lt;simpleType name='less-than-one-hundred-and-one'&gt;
  &lt;restriction base='integer'&gt;
    &lt;maxExclusive value='101'/&gt;
  &lt;/restriction&gt;
&lt;/simpleType&gt;</pre></div><div class="exampleWrapper">
Note that the
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of this datatype is identical to
the previous one (named 'one-hundred-or-less').
</div></div><div class="div4">
<h5><a id="dc-maxExclusive" name="dc-maxExclusive"/>4.3.8.1 The maxExclusive Schema Component</h5><div class="schemaComp"><div class="compHeader"><span class="schemaComp">Schema&#xa0;Component</span>:&#xa0;<a href="#dt-maxExclusive">maxExclusive</a></div><div class="compBody">
<dl class="props">
<dt><a name="maxExclusive-value" id="maxExclusive-value"><span class="propdef">{value}</span></a></dt><dd>
A value from the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of the
<a class="propref" href="#defn-basetype">{base type definition}</a>.
</dd>
<dt><a name="maxExclusive-fixed" id="maxExclusive-fixed"><span class="propdef">{fixed}</span></a></dt><dd>
A <a href="#boolean">boolean</a>.
</dd>
<dt><a name="maxExclusive-annotation" id="maxExclusive-annotation"><span class="propdef">{annotation}</span></a></dt><dd>
Optional.  An <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#Annotation">annotation</a>.
</dd>
</dl>
</div></div><p>
If <a class="propref" href="#maxExclusive-fixed">{fixed}</a> is <em>true</em>, then types for which
the current type is the <a class="propref" href="#defn-basetype">{base type definition}</a> cannot specify a
value for <a href="#dc-maxExclusive">maxExclusive</a> other than <a class="propref" href="#maxExclusive-value">{value}</a>.
</p></div><div class="div4">
<h5><a id="xr-maxExclusive" name="xr-maxExclusive"/>4.3.8.2 XML Representation of maxExclusive Schema Components</h5><p>
The XML representation for a <a href="#dc-maxExclusive">maxExclusive</a> schema
component is a <a class="eltref" href="#element-maxExclusive">&lt;maxExclusive&gt;</a> element information item. The
correspondences between the properties of the information item and
properties of the component are as follows:
</p><div class="reprdef"><div class="reprHeader"><span class="reprdef">XML&#xa0;Representation&#xa0;Summary</span>:&#xa0;<code>maxExclusive</code>&#xa0;Element Information Item</div><div class="reprBody">
<p class="element-syntax-1"><a name="element-maxExclusive" id="element-maxExclusive">&lt;maxExclusive</a><br/>&#xa0;&#xa0;fixed = <a href="#boolean">boolean</a>&#xa0;:&#xa0;false<br/>&#xa0;&#xa0;id = <a href="#ID">ID</a><br/>&#xa0;&#xa0;<b>value</b> = <a href="#dt-anySimpleType">anySimpleType</a><br/>&#xa0;&#xa0;<em>{any attributes with non-schema namespace . . .}</em>&gt;<br/><em>&#xa0;&#xa0;Content: </em>(<a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">annotation</a>?)<br/>&lt;/maxExclusive&gt;</p>
<div class="reprdep">
<a class="propref" href="#maxExclusive-value">{value}</a>&#xa0;<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be
in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <a class="propref" href="#defn-basetype">{base type definition}</a>.
</div><div class="reprcomp"><table class="reprcomp"><thead><tr><th><a href="#dt-maxExclusive">maxExclusive</a><strong>&#xa0;Schema Component</strong></th></tr></thead><tbody><tr><td><table cellpadding="3" border="0"><thead><tr><th align="left">Property</th><th align="left">Representation</th></tr></thead><tbody valign="top"><tr valign="top"><td><a class="propref" href="#maxExclusive-value">{value}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the <code>value</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>
</td></tr><tr valign="top"><td><a class="propref" href="#maxExclusive-fixed">{fixed}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the <code>fixed</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>, if present, otherwise false
</td></tr><tr valign="top"><td><a class="propref" href="#defn-annotation">{annotation}</a></td><td>
The annotations corresponding to all the <a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">&lt;annotation&gt;</a>
element information items in the <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.element">[children]</a>, if any.
</td></tr></tbody></table></td></tr></tbody></table></div>
</div></div></div><div class="div4">
<h5><a id="maxExclusive-validation-rules" name="maxExclusive-validation-rules"/>4.3.8.3 maxExclusive Validation Rules</h5><div class="constraintnote"><a name="cvc-maxExclusive-valid" id="cvc-maxExclusive-valid"/><b>Validation Rule:  maxExclusive Valid</b><br/><div class="constraint">
A value in an <a class="termref" href="#dt-ordered"><span class="arrow">&#xb7;</span>ordered<span class="arrow">&#xb7;</span></a>&#xa0;<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
is facet-valid with respect to <a class="termref" href="#dt-maxExclusive"><span class="arrow">&#xb7;</span>maxExclusive<span class="arrow">&#xb7;</span></a>, determined
as follows:
<div class="constraintlist"><div class="clnumber">1 
if the <a class="termref" href="#dt-numeric"><span class="arrow">&#xb7;</span>numeric<span class="arrow">&#xb7;</span></a> property in
<a class="propref" href="#defn-fund-facets">{fundamental facets}</a> is <em>true</em>, then the
value <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be numerically less than
<a class="propref" href="#maxExclusive-value">{value}</a>;
</div><div class="clnumber">2 
if the <a class="termref" href="#dt-numeric"><span class="arrow">&#xb7;</span>numeric<span class="arrow">&#xb7;</span></a> property in
<a class="propref" href="#defn-fund-facets">{fundamental facets}</a> is <em>false</em> (i.e.,
<a class="propref" href="#defn-basetype">{base type definition}</a> is one of the date and time related
datatypes), then the value <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be chronologically
less than <a class="propref" href="#maxExclusive-value">{value}</a>;
</div></div></div></div></div><div class="div4">
<h5><a id="maxExclusive-coss" name="maxExclusive-coss"/>4.3.8.4 Constraints on maxExclusive Schema Components</h5><div class="constraintnote"><a name="maxInclusive-maxExclusive" id="maxInclusive-maxExclusive"/><b>Schema Component Constraint:  maxInclusive and maxExclusive</b><br/><div class="constraint">
It is an <a class="termref" href="#dt-error"><span class="arrow">&#xb7;</span>error<span class="arrow">&#xb7;</span></a> for both
<a class="termref" href="#dt-maxInclusive"><span class="arrow">&#xb7;</span>maxInclusive<span class="arrow">&#xb7;</span></a> and <a class="termref" href="#dt-maxExclusive"><span class="arrow">&#xb7;</span>maxExclusive<span class="arrow">&#xb7;</span></a>
to be specified in the same derivation step of a datatype definition.
</div></div><div class="constraintnote"><a name="minExclusive-less-than-equal-to-maxExclusive" id="minExclusive-less-than-equal-to-maxExclusive"/><b>Schema Component Constraint:  minExclusive &lt;= maxExclusive</b><br/><div class="constraint">
It is an <a class="termref" href="#dt-error"><span class="arrow">&#xb7;</span>error<span class="arrow">&#xb7;</span></a> for the value specified for
<a class="termref" href="#dt-minExclusive"><span class="arrow">&#xb7;</span>minExclusive<span class="arrow">&#xb7;</span></a> to be greater than the value
specified for <a class="termref" href="#dt-maxExclusive"><span class="arrow">&#xb7;</span>maxExclusive<span class="arrow">&#xb7;</span></a> for the same datatype.
</div></div><div class="constraintnote"><a name="maxExclusive-valid-restriction" id="maxExclusive-valid-restriction"/><b>Schema Component Constraint:  maxExclusive valid restriction</b><br/><div class="constraint">
It is an <a class="termref" href="#dt-error"><span class="arrow">&#xb7;</span>error<span class="arrow">&#xb7;</span></a> if any of the following conditions
is true:
<div class="constraintlist"><div class="clnumber">1 
<a href="#dc-maxExclusive">maxExclusive</a> is among the members of
<a class="propref" href="#defn-facets">{facets}</a> of <a class="propref" href="#defn-basetype">{base type definition}</a>
and <a class="propref" href="#maxExclusive-value">{value}</a> is
greater than the <a class="propref" href="#maxExclusive-value">{value}</a> of the parent
<a href="#dc-maxExclusive">maxExclusive</a>
</div><div class="clnumber">2 
<a href="#dc-maxInclusive">maxInclusive</a> is among the members of
<a class="propref" href="#defn-facets">{facets}</a> of <a class="propref" href="#defn-basetype">{base type definition}</a>
and <a class="propref" href="#maxExclusive-value">{value}</a> is
greater than the <a class="propref" href="#maxInclusive-value">{value}</a> of the parent
<a href="#dc-maxInclusive">maxInclusive</a>
</div><div class="clnumber">3 
<a href="#dc-minInclusive">minInclusive</a> is among the members of
<a class="propref" href="#defn-facets">{facets}</a> of <a class="propref" href="#defn-basetype">{base type definition}</a>
and <a class="propref" href="#maxExclusive-value">{value}</a> is
less than or equal to the <a class="propref" href="#minInclusive-value">{value}</a> of the parent
<a href="#dc-minInclusive">minInclusive</a>
</div><div class="clnumber">4 
<a href="#dc-minExclusive">minExclusive</a> is among the members of
<a class="propref" href="#defn-facets">{facets}</a> of <a class="propref" href="#defn-basetype">{base type definition}</a>
and <a class="propref" href="#maxExclusive-value">{value}</a> is
less than or equal to the <a class="propref" href="#minExclusive-value">{value}</a> of the parent
<a href="#dc-minExclusive">minExclusive</a>
</div></div></div></div></div></div><div class="div3">
<h4><a id="rf-minExclusive" name="rf-minExclusive"/>4.3.9 minExclusive</h4><p>
<span class="termdef"><a id="dt-minExclusive" name="dt-minExclusive">[Definition:]&#xa0;&#xa0;</a>
<b>minExclusive</b> is the <a class="termref" href="#dt-exclusive-lower-bound"><span class="arrow">&#xb7;</span>exclusive lower bound<span class="arrow">&#xb7;</span></a>
of the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> for a datatype with the
<a class="termref" href="#dt-ordered"><span class="arrow">&#xb7;</span>ordered<span class="arrow">&#xb7;</span></a> property.
The value of <b>minExclusive</b>&#xa0;<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a>
be in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of the
<a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a>
 or be equal to <a class="propref" href="#minExclusive-value">{value}</a> in
<a class="propref" href="#defn-basetype">{base type definition}</a>.
</span>
</p><p>
<a class="termref" href="#dt-minExclusive"><span class="arrow">&#xb7;</span>minExclusive<span class="arrow">&#xb7;</span></a> provides for:
</p><ul><li>
Constraining a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> to values
with a specific <a class="termref" href="#dt-exclusive-lower-bound"><span class="arrow">&#xb7;</span>exclusive lower bound<span class="arrow">&#xb7;</span></a>.
</li></ul><div class="exampleOuter"><div class="exampleHeader">Example</div><div class="exampleWrapper">
The following is the definition of a <a class="termref" href="#dt-user-derived"><span class="arrow">&#xb7;</span>user-derived<span class="arrow">&#xb7;</span></a>
datatype which limits values to integers greater than or equal to
100, using <a class="termref" href="#dt-minExclusive"><span class="arrow">&#xb7;</span>minExclusive<span class="arrow">&#xb7;</span></a>.
</div><div class="exampleInner"><pre>&lt;simpleType name='more-than-ninety-nine'&gt;
  &lt;restriction base='integer'&gt;
    &lt;minExclusive value='99'/&gt;
  &lt;/restriction&gt;
&lt;/simpleType&gt;</pre></div><div class="exampleWrapper">
Note that the
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of this datatype is identical to
the previous one (named 'one-hundred-or-more').
</div></div><div class="div4">
<h5><a id="dc-minExclusive" name="dc-minExclusive"/>4.3.9.1 The minExclusive Schema Component</h5><div class="schemaComp"><div class="compHeader"><span class="schemaComp">Schema&#xa0;Component</span>:&#xa0;<a href="#dt-minExclusive">minExclusive</a></div><div class="compBody">
<dl class="props">
<dt><a name="minExclusive-value" id="minExclusive-value"><span class="propdef">{value}</span></a></dt><dd>
A value from the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of the
<a class="propref" href="#defn-basetype">{base type definition}</a>.
</dd>
<dt><a name="minExclusive-fixed" id="minExclusive-fixed"><span class="propdef">{fixed}</span></a></dt><dd>
A <a href="#boolean">boolean</a>.
</dd>
<dt><a name="minExclusive-annotation" id="minExclusive-annotation"><span class="propdef">{annotation}</span></a></dt><dd>
Optional.  An <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#Annotation">annotation</a>.
</dd>
</dl>
</div></div><p>
If <a class="propref" href="#minExclusive-fixed">{fixed}</a> is <em>true</em>, then types for which
the current type is the <a class="propref" href="#defn-basetype">{base type definition}</a> cannot specify a
value for <a href="#dc-minExclusive">minExclusive</a> other than <a class="propref" href="#minExclusive-value">{value}</a>.
</p></div><div class="div4">
<h5><a id="xr-minExclusive" name="xr-minExclusive"/>4.3.9.2 XML Representation of minExclusive Schema Components</h5><p>
The XML representation for a <a href="#dc-minExclusive">minExclusive</a> schema
component is a <a class="eltref" href="#element-minExclusive">&lt;minExclusive&gt;</a> element information item. The
correspondences between the properties of the information item and
properties of the component are as follows:
</p><div class="reprdef"><div class="reprHeader"><span class="reprdef">XML&#xa0;Representation&#xa0;Summary</span>:&#xa0;<code>minExclusive</code>&#xa0;Element Information Item</div><div class="reprBody">
<p class="element-syntax-1"><a name="element-minExclusive" id="element-minExclusive">&lt;minExclusive</a><br/>&#xa0;&#xa0;fixed = <a href="#boolean">boolean</a>&#xa0;:&#xa0;false<br/>&#xa0;&#xa0;id = <a href="#ID">ID</a><br/>&#xa0;&#xa0;<b>value</b> = <a href="#dt-anySimpleType">anySimpleType</a><br/>&#xa0;&#xa0;<em>{any attributes with non-schema namespace . . .}</em>&gt;<br/><em>&#xa0;&#xa0;Content: </em>(<a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">annotation</a>?)<br/>&lt;/minExclusive&gt;</p>
<div class="reprdep">
<a class="propref" href="#minExclusive-value">{value}</a>&#xa0;<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be
in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <a class="propref" href="#defn-basetype">{base type definition}</a>.
</div><div class="reprcomp"><table class="reprcomp"><thead><tr><th><a href="#dt-minExclusive">minExclusive</a><strong>&#xa0;Schema Component</strong></th></tr></thead><tbody><tr><td><table cellpadding="3" border="0"><thead><tr><th align="left">Property</th><th align="left">Representation</th></tr></thead><tbody valign="top"><tr valign="top"><td><a class="propref" href="#minExclusive-value">{value}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the <code>value</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>
</td></tr><tr valign="top"><td><a class="propref" href="#minExclusive-fixed">{fixed}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the <code>fixed</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>, if present, otherwise false
</td></tr><tr valign="top"><td><a class="propref" href="#defn-annotation">{annotation}</a></td><td>
The annotations corresponding to all the <a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">&lt;annotation&gt;</a>
element information items in the <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.element">[children]</a>, if any.
</td></tr></tbody></table></td></tr></tbody></table></div>
</div></div></div><div class="div4">
<h5><a id="minExclusive-validation-rules" name="minExclusive-validation-rules"/>4.3.9.3 minExclusive Validation Rules</h5><div class="constraintnote"><a name="cvc-minExclusive-valid" id="cvc-minExclusive-valid"/><b>Validation Rule:  minExclusive Valid</b><br/><div class="constraint">
A value in an <a class="termref" href="#dt-ordered"><span class="arrow">&#xb7;</span>ordered<span class="arrow">&#xb7;</span></a>&#xa0;<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
is facet-valid with respect to <a class="termref" href="#dt-minExclusive"><span class="arrow">&#xb7;</span>minExclusive<span class="arrow">&#xb7;</span></a> if:
<div class="constraintlist"><div class="clnumber">1 
if the <a class="termref" href="#dt-numeric"><span class="arrow">&#xb7;</span>numeric<span class="arrow">&#xb7;</span></a> property in
<a class="propref" href="#defn-fund-facets">{fundamental facets}</a> is <em>true</em>, then the
value <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be numerically greater than
<a class="propref" href="#minExclusive-value">{value}</a>;
</div><div class="clnumber">2 
if the <a class="termref" href="#dt-numeric"><span class="arrow">&#xb7;</span>numeric<span class="arrow">&#xb7;</span></a> property in
<a class="propref" href="#defn-fund-facets">{fundamental facets}</a> is <em>false</em> (i.e.,
<a class="propref" href="#defn-basetype">{base type definition}</a> is one of the date and time related
datatypes), then the value <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be chronologically
greater than <a class="propref" href="#minExclusive-value">{value}</a>;
</div></div></div></div></div><div class="div4">
<h5><a id="minExclusive-coss" name="minExclusive-coss"/>4.3.9.4 Constraints on minExclusive Schema Components</h5><div class="constraintnote"><a name="minInclusive-minExclusive" id="minInclusive-minExclusive"/><b>Schema Component Constraint:  minInclusive and minExclusive</b><br/><div class="constraint">
It is an <a class="termref" href="#dt-error"><span class="arrow">&#xb7;</span>error<span class="arrow">&#xb7;</span></a> for both
<a class="termref" href="#dt-minInclusive"><span class="arrow">&#xb7;</span>minInclusive<span class="arrow">&#xb7;</span></a> and <a class="termref" href="#dt-minExclusive"><span class="arrow">&#xb7;</span>minExclusive<span class="arrow">&#xb7;</span></a>
to be specified for the same datatype.
</div></div><div class="constraintnote"><a name="minExclusive-less-than-maxInclusive" id="minExclusive-less-than-maxInclusive"/><b>Schema Component Constraint:  minExclusive &lt; maxInclusive</b><br/><div class="constraint">
It is an <a class="termref" href="#dt-error"><span class="arrow">&#xb7;</span>error<span class="arrow">&#xb7;</span></a> for the value specified for
<a class="termref" href="#dt-minExclusive"><span class="arrow">&#xb7;</span>minExclusive<span class="arrow">&#xb7;</span></a> to be greater than or equal to the value
specified for <a class="termref" href="#dt-maxInclusive"><span class="arrow">&#xb7;</span>maxInclusive<span class="arrow">&#xb7;</span></a> for the same datatype.
</div></div><div class="constraintnote"><a name="minExclusive-valid-restriction" id="minExclusive-valid-restriction"/><b>Schema Component Constraint:  minExclusive valid restriction</b><br/><div class="constraint">
It is an <a class="termref" href="#dt-error"><span class="arrow">&#xb7;</span>error<span class="arrow">&#xb7;</span></a> if any of the following conditions
is true:
<div class="constraintlist"><div class="clnumber">1 
<a href="#dc-minExclusive">minExclusive</a> is among the members of
<a class="propref" href="#defn-facets">{facets}</a> of <a class="propref" href="#defn-basetype">{base type definition}</a>
and <a class="propref" href="#minExclusive-value">{value}</a> is
less than the <a class="propref" href="#minExclusive-value">{value}</a> of the parent
<a href="#dc-minExclusive">minExclusive</a>
</div><div class="clnumber">2 
<a href="#dc-maxInclusive">maxInclusive</a> is among the members of
<a class="propref" href="#defn-facets">{facets}</a> of <a class="propref" href="#defn-basetype">{base type definition}</a>
and <a class="propref" href="#minExclusive-value">{value}</a> is
greater the <a class="propref" href="#maxInclusive-value">{value}</a> of the parent
<a href="#dc-maxInclusive">maxInclusive</a>
</div><div class="clnumber">3 
<a href="#dc-minInclusive">minInclusive</a> is among the members of
<a class="propref" href="#defn-facets">{facets}</a> of <a class="propref" href="#defn-basetype">{base type definition}</a>
and <a class="propref" href="#minExclusive-value">{value}</a> is
less than the <a class="propref" href="#minInclusive-value">{value}</a> of the parent
<a href="#dc-minInclusive">minInclusive</a>
</div><div class="clnumber">4 
<a href="#dc-maxExclusive">maxExclusive</a> is among the members of
<a class="propref" href="#defn-facets">{facets}</a> of <a class="propref" href="#defn-basetype">{base type definition}</a>
and <a class="propref" href="#maxExclusive-value">{value}</a> is
greater than or equal to the <a class="propref" href="#maxExclusive-value">{value}</a> of the parent
<a href="#dc-maxExclusive">maxExclusive</a>
</div></div></div></div></div></div><div class="div3">
<h4><a id="rf-minInclusive" name="rf-minInclusive"/>4.3.10 minInclusive</h4><p>
<span class="termdef"><a id="dt-minInclusive" name="dt-minInclusive">[Definition:]&#xa0;&#xa0;</a>
<b>minInclusive</b> is the <a class="termref" href="#dt-inclusive-lower-bound"><span class="arrow">&#xb7;</span>inclusive lower bound<span class="arrow">&#xb7;</span></a>
of the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> for a datatype with the
<a class="termref" href="#dt-ordered"><span class="arrow">&#xb7;</span>ordered<span class="arrow">&#xb7;</span></a> property.  The value of
<b>minInclusive</b>
&#xa0;<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of the
<a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a>.
</span>
</p><p>
<a class="termref" href="#dt-minInclusive"><span class="arrow">&#xb7;</span>minInclusive<span class="arrow">&#xb7;</span></a> provides for:
</p><ul><li>
Constraining a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> to values
with a specific <a class="termref" href="#dt-inclusive-lower-bound"><span class="arrow">&#xb7;</span>inclusive lower bound<span class="arrow">&#xb7;</span></a>.
</li></ul><div class="exampleOuter"><div class="exampleHeader">Example</div><div class="exampleWrapper">
The following is the definition of a <a class="termref" href="#dt-user-derived"><span class="arrow">&#xb7;</span>user-derived<span class="arrow">&#xb7;</span></a>
datatype which limits values to integers greater than or equal to
100, using <a class="termref" href="#dt-minInclusive"><span class="arrow">&#xb7;</span>minInclusive<span class="arrow">&#xb7;</span></a>.
</div><div class="exampleInner"><pre>&lt;simpleType name='one-hundred-or-more'&gt;
  &lt;restriction base='integer'&gt;
    &lt;minInclusive value='100'/&gt;
  &lt;/restriction&gt;
&lt;/simpleType&gt;</pre></div></div><div class="div4">
<h5><a id="dc-minInclusive" name="dc-minInclusive"/>4.3.10.1 The minInclusive Schema Component</h5><div class="schemaComp"><div class="compHeader"><span class="schemaComp">Schema&#xa0;Component</span>:&#xa0;<a href="#dt-minInclusive">minInclusive</a></div><div class="compBody">
<dl class="props">
<dt><a name="minInclusive-value" id="minInclusive-value"><span class="propdef">{value}</span></a></dt><dd>
A value from the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of the
<a class="propref" href="#defn-basetype">{base type definition}</a>.
</dd>
<dt><a name="minInclusive-fixed" id="minInclusive-fixed"><span class="propdef">{fixed}</span></a></dt><dd>
A <a href="#boolean">boolean</a>.
</dd>
<dt><a name="minInclusive-annotation" id="minInclusive-annotation"><span class="propdef">{annotation}</span></a></dt><dd>
Optional.  An <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#Annotation">annotation</a>.
</dd>
</dl>
</div></div><p>
If <a class="propref" href="#minInclusive-fixed">{fixed}</a> is <em>true</em>, then types for which
the current type is the <a class="propref" href="#defn-basetype">{base type definition}</a> cannot specify a
value for <a href="#dc-minInclusive">minInclusive</a> other than <a class="propref" href="#minInclusive-value">{value}</a>.
</p></div><div class="div4">
<h5><a id="xr-minInclusive" name="xr-minInclusive"/>4.3.10.2 XML Representation of minInclusive Schema Components</h5><p>
The XML representation for a <a href="#dc-minInclusive">minInclusive</a> schema
component is a <a class="eltref" href="#element-minInclusive">&lt;minInclusive&gt;</a> element information item. The
correspondences between the properties of the information item and
properties of the component are as follows:
</p><div class="reprdef"><div class="reprHeader"><span class="reprdef">XML&#xa0;Representation&#xa0;Summary</span>:&#xa0;<code>minInclusive</code>&#xa0;Element Information Item</div><div class="reprBody">
<p class="element-syntax-1"><a name="element-minInclusive" id="element-minInclusive">&lt;minInclusive</a><br/>&#xa0;&#xa0;fixed = <a href="#boolean">boolean</a>&#xa0;:&#xa0;false<br/>&#xa0;&#xa0;id = <a href="#ID">ID</a><br/>&#xa0;&#xa0;<b>value</b> = <a href="#dt-anySimpleType">anySimpleType</a><br/>&#xa0;&#xa0;<em>{any attributes with non-schema namespace . . .}</em>&gt;<br/><em>&#xa0;&#xa0;Content: </em>(<a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">annotation</a>?)<br/>&lt;/minInclusive&gt;</p>
<div class="reprdep">
<a class="propref" href="#minInclusive-value">{value}</a>&#xa0;<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be
in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of <a class="propref" href="#defn-basetype">{base type definition}</a>.
</div><div class="reprcomp"><table class="reprcomp"><thead><tr><th><a href="#dt-minInclusive">minInclusive</a><strong>&#xa0;Schema Component</strong></th></tr></thead><tbody><tr><td><table cellpadding="3" border="0"><thead><tr><th align="left">Property</th><th align="left">Representation</th></tr></thead><tbody valign="top"><tr valign="top"><td><a class="propref" href="#minInclusive-value">{value}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the <code>value</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>
</td></tr><tr valign="top"><td><a class="propref" href="#minInclusive-fixed">{fixed}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the <code>fixed</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>, if present, otherwise false
</td></tr><tr valign="top"><td><a class="propref" href="#defn-annotation">{annotation}</a></td><td>
The annotations corresponding to all the <a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">&lt;annotation&gt;</a>
element information items in the <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.element">[children]</a>, if any.
</td></tr></tbody></table></td></tr></tbody></table></div>
</div></div></div><div class="div4">
<h5><a id="minInclusive-validation-rules" name="minInclusive-validation-rules"/>4.3.10.3 minInclusive Validation Rules</h5><div class="constraintnote"><a name="cvc-minInclusive-valid" id="cvc-minInclusive-valid"/><b>Validation Rule:  minInclusive Valid</b><br/><div class="constraint">
A value in an <a class="termref" href="#dt-ordered"><span class="arrow">&#xb7;</span>ordered<span class="arrow">&#xb7;</span></a>&#xa0;<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
is facet-valid with respect to <a class="termref" href="#dt-minInclusive"><span class="arrow">&#xb7;</span>minInclusive<span class="arrow">&#xb7;</span></a> if:
<div class="constraintlist"><div class="clnumber">1 
if the <a class="termref" href="#dt-numeric"><span class="arrow">&#xb7;</span>numeric<span class="arrow">&#xb7;</span></a> property in
<a class="propref" href="#defn-fund-facets">{fundamental facets}</a> is <em>true</em>, then the
value <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be numerically greater than or equal to
<a class="propref" href="#minInclusive-value">{value}</a>;
</div><div class="clnumber">2 
if the <a class="termref" href="#dt-numeric"><span class="arrow">&#xb7;</span>numeric<span class="arrow">&#xb7;</span></a> property in
<a class="propref" href="#defn-fund-facets">{fundamental facets}</a> is <em>false</em> (i.e.,
<a class="propref" href="#defn-basetype">{base type definition}</a> is one of the date and time related
datatypes), then the value <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be chronologically
greater than or equal to <a class="propref" href="#minInclusive-value">{value}</a>;
</div></div></div></div></div><div class="div4">
<h5><a id="minInclusive-coss" name="minInclusive-coss"/>4.3.10.4 Constraints on minInclusive Schema Components</h5><div class="constraintnote"><a name="minInclusive-less-than-maxExclusive" id="minInclusive-less-than-maxExclusive"/><b>Schema Component Constraint:  minInclusive &lt; maxExclusive</b><br/><div class="constraint">
It is an <a class="termref" href="#dt-error"><span class="arrow">&#xb7;</span>error<span class="arrow">&#xb7;</span></a> for the value specified for
<a class="termref" href="#dt-minInclusive"><span class="arrow">&#xb7;</span>minInclusive<span class="arrow">&#xb7;</span></a> to be greater than or equal to the value
specified for <a class="termref" href="#dt-maxExclusive"><span class="arrow">&#xb7;</span>maxExclusive<span class="arrow">&#xb7;</span></a> for the same datatype.
</div></div><div class="constraintnote"><a name="minInclusive-valid-restriction" id="minInclusive-valid-restriction"/><b>Schema Component Constraint:  minInclusive valid restriction</b><br/><div class="constraint">
It is an <a class="termref" href="#dt-error"><span class="arrow">&#xb7;</span>error<span class="arrow">&#xb7;</span></a> if any of the following conditions
is true:
<div class="constraintlist"><div class="clnumber">1 
<a href="#dc-minInclusive">minInclusive</a> is among the members of
<a class="propref" href="#defn-facets">{facets}</a> of <a class="propref" href="#defn-basetype">{base type definition}</a>
and <a class="propref" href="#minInclusive-value">{value}</a> is
less than the <a class="propref" href="#minInclusive-value">{value}</a> of the parent
<a href="#dc-minInclusive">minInclusive</a>
</div><div class="clnumber">2 
<a href="#dc-maxInclusive">maxInclusive</a> is among the members of
<a class="propref" href="#defn-facets">{facets}</a> of <a class="propref" href="#defn-basetype">{base type definition}</a>
and <a class="propref" href="#minInclusive-value">{value}</a> is
greater the <a class="propref" href="#maxInclusive-value">{value}</a> of the parent
<a href="#dc-maxInclusive">maxInclusive</a>
</div><div class="clnumber">3 
<a href="#dc-minExclusive">minExclusive</a> is among the members of
<a class="propref" href="#defn-facets">{facets}</a> of <a class="propref" href="#defn-basetype">{base type definition}</a>
and <a class="propref" href="#minInclusive-value">{value}</a> is
less than or equal to the <a class="propref" href="#minExclusive-value">{value}</a> of the parent
<a href="#dc-minExclusive">minExclusive</a>
</div><div class="clnumber">4 
<a href="#dc-maxExclusive">maxExclusive</a> is among the members of
<a class="propref" href="#defn-facets">{facets}</a> of <a class="propref" href="#defn-basetype">{base type definition}</a>
and <a class="propref" href="#minInclusive-value">{value}</a> is
greater than or equal to the <a class="propref" href="#maxExclusive-value">{value}</a> of the parent
<a href="#dc-maxExclusive">maxExclusive</a>
</div></div></div></div></div></div><div class="div3">
<h4><a id="rf-totalDigits" name="rf-totalDigits"/>4.3.11 totalDigits</h4><p>
<span class="termdef"><a id="dt-totalDigits" name="dt-totalDigits">[Definition:]&#xa0;&#xa0;</a>
<b>totalDigits</b>
controls the maximum number of values in
the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>

of datatypes <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from <a href="#decimal">decimal</a>,
by restricting it to numbers that are expressible as
<em>i &#xd7; 10^-n</em> where <em>i</em>
and <em>n</em> are integers such that
<em>|i| &lt; 10^totalDigits</em> and
<em>0 &lt;= n &lt;= totalDigits</em>.
The value of
<b>totalDigits</b>&#xa0;<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> be a
<a href="#positiveInteger">positiveInteger</a>.
</span>
</p><p>

The term <b>totalDigits</b> is chosen to reflect the fact that it
restricts the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> to those values that can
be represented lexically using at most <em>totalDigits</em>
digits. Note that it does not restrict the <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a>
directly; a lexical representation that adds
additional leading zero digits or trailing fractional zero digits is
still permitted.

</p><div class="div4">
<h5><a id="dc-totalDigits" name="dc-totalDigits"/>4.3.11.1 The totalDigits Schema Component</h5><div class="schemaComp"><div class="compHeader"><span class="schemaComp">Schema&#xa0;Component</span>:&#xa0;<a href="#dt-totalDigits">totalDigits</a></div><div class="compBody">
<dl class="props">
<dt><a name="totalDigits-value" id="totalDigits-value"><span class="propdef">{value}</span></a></dt><dd>
A <a href="#positiveInteger">positiveInteger</a>.
</dd>
<dt><a name="totalDigits-fixed" id="totalDigits-fixed"><span class="propdef">{fixed}</span></a></dt><dd>
A <a href="#boolean">boolean</a>.
</dd>
<dt><a name="totalDigits-annotation" id="totalDigits-annotation"><span class="propdef">{annotation}</span></a></dt><dd>
Optional.  An <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#Annotation">annotation</a>.
</dd>
</dl>
</div></div><p>
If <a class="propref" href="#totalDigits-fixed">{fixed}</a> is <em>true</em>, then types for which
the current type is the <a class="propref" href="#defn-basetype">{base type definition}</a> cannot specify a
value for <a href="#dc-totalDigits">totalDigits</a> other than
<a class="propref" href="#totalDigits-value">{value}</a>.
</p></div><div class="div4">
<h5><a id="xr-totalDigits" name="xr-totalDigits"/>4.3.11.2 XML Representation of totalDigits Schema Components</h5><p>
The XML representation for a <a href="#dc-totalDigits">totalDigits</a> schema
component is a <a class="eltref" href="#element-totalDigits">&lt;totalDigits&gt;</a> element information item. The
correspondences between the properties of the information item and
properties of the component are as follows:
</p><div class="reprdef"><div class="reprHeader"><span class="reprdef">XML&#xa0;Representation&#xa0;Summary</span>:&#xa0;<code>totalDigits</code>&#xa0;Element Information Item</div><div class="reprBody">
<p class="element-syntax-1"><a name="element-totalDigits" id="element-totalDigits">&lt;totalDigits</a><br/>&#xa0;&#xa0;fixed = <a href="#boolean">boolean</a>&#xa0;:&#xa0;false<br/>&#xa0;&#xa0;id = <a href="#ID">ID</a><br/>&#xa0;&#xa0;<b>value</b> = <a href="#positiveInteger">positiveInteger</a><br/>&#xa0;&#xa0;<em>{any attributes with non-schema namespace . . .}</em>&gt;<br/><em>&#xa0;&#xa0;Content: </em>(<a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">annotation</a>?)<br/>&lt;/totalDigits&gt;</p>
<div class="reprcomp"><table class="reprcomp"><thead><tr><th><a href="#dc-totalDigits">totalDigits</a><strong>&#xa0;Schema Component</strong></th></tr></thead><tbody><tr><td><table cellpadding="3" border="0"><thead><tr><th align="left">Property</th><th align="left">Representation</th></tr></thead><tbody valign="top"><tr valign="top"><td><a class="propref" href="#totalDigits-value">{value}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the <code>value</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>
</td></tr><tr valign="top"><td><a class="propref" href="#totalDigits-fixed">{fixed}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the <code>fixed</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>, if present, otherwise false
</td></tr><tr valign="top"><td><a class="propref" href="#defn-annotation">{annotation}</a></td><td>
The annotations corresponding to all the <a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">&lt;annotation&gt;</a>
element information items in the <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.element">[children]</a>, if any.
</td></tr></tbody></table></td></tr></tbody></table></div>
</div></div></div><div class="div4">
<h5><a id="totalDigits-validation-rules" name="totalDigits-validation-rules"/>4.3.11.3 totalDigits Validation Rules</h5><div class="constraintnote"><a name="cvc-totalDigits-valid" id="cvc-totalDigits-valid"/><b>Validation Rule:  totalDigits Valid</b><br/><div class="constraint">
A value in a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> is facet-valid with
respect to <a class="termref" href="#dt-totalDigits"><span class="arrow">&#xb7;</span>totalDigits<span class="arrow">&#xb7;</span></a> if:
<div class="constraintlist"><div class="clnumber">1 

that value is expressible as <em>i &#xd7; 10^-n</em> where
<em>i</em> and <em>n</em> are integers such that
<em>|i| &lt; 10^<a class="propref" href="#totalDigits-value">{value}</a></em> and
<em>0 &lt;= n &lt;= <a class="propref" href="#totalDigits-value">{value}</a></em>.


</div></div></div></div></div><div class="div4">
<h5><a id="totalDigits-coss" name="totalDigits-coss"/>4.3.11.4 Constraints on totalDigits Schema Components</h5><div class="constraintnote"><a name="totalDigits-valid-restriction" id="totalDigits-valid-restriction"/><b>Schema Component Constraint:  totalDigits valid restriction</b><br/><div class="constraint">
It is an <a class="termref" href="#dt-error"><span class="arrow">&#xb7;</span>error<span class="arrow">&#xb7;</span></a> if
<a href="#dc-totalDigits">totalDigits</a> is among the members of
<a class="propref" href="#defn-facets">{facets}</a> of <a class="propref" href="#defn-basetype">{base type definition}</a>
and <a class="propref" href="#totalDigits-value">{value}</a> is
greater than the <a class="propref" href="#totalDigits-value">{value}</a> of the parent
<a href="#dc-totalDigits">totalDigits</a>
</div></div></div></div><div class="div3">
<h4><a id="rf-fractionDigits" name="rf-fractionDigits"/>4.3.12 fractionDigits</h4><p>
<span class="termdef"><a id="dt-fractionDigits" name="dt-fractionDigits">[Definition:]&#xa0;&#xa0;</a>
<b>fractionDigits</b>
controls the size of the minimum difference
between values

in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> of datatypes <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>
from <b>decimal</b>,
by restricting the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> to numbers that are
expressible as <em>i &#xd7; 10^-n</em> where
<em>i</em> and <em>n</em>
are integers and <em>0 &lt;= n &lt;= fractionDigits</em>.
The value of <b>fractionDigits</b>&#xa0;<a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a>
be a <a href="#nonNegativeInteger">nonNegativeInteger</a>.
</span>
</p><p>

The term <b>fractionDigits</b> is chosen to reflect the fact that it
restricts the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> to those values that can be
represented lexically using at most <em>fractionDigits</em>
to the right of the decimal point. Note that it does not restrict the
<a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> directly; a
non-<a class="termref" href="#dt-canonical-representation"><span class="arrow">&#xb7;</span>canonical lexical representation<span class="arrow">&#xb7;</span></a> that adds additional
leading zero digits or trailing fractional zero digits is still permitted.

</p><div class="exampleOuter"><div class="exampleHeader">Example</div><div class="exampleWrapper">
The following is the definition of a <a class="termref" href="#dt-user-derived"><span class="arrow">&#xb7;</span>user-derived<span class="arrow">&#xb7;</span></a>
datatype which could be used to represent the magnitude
of a person's body temperature on the Celsius scale.
This definition would appear in a schema authored by an &quot;end-user&quot;
and shows how to define a datatype by specifying facet values which
constrain the range of the <a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a>.
</div><div class="exampleInner"><pre>&lt;simpleType name='celsiusBodyTemp'&gt;
  &lt;restriction base='decimal'&gt;
    &lt;totalDigits value='4'/&gt;
    &lt;fractionDigits value='1'/&gt;
    &lt;minInclusive value='36.4'/&gt;
    &lt;maxInclusive value='40.5'/&gt;
  &lt;/restriction&gt;
&lt;/simpleType&gt;
</pre></div></div><div class="div4">
<h5><a id="dc-fractionDigits" name="dc-fractionDigits"/>4.3.12.1 The fractionDigits Schema Component</h5><div class="schemaComp"><div class="compHeader"><span class="schemaComp">Schema&#xa0;Component</span>:&#xa0;<a href="#dt-fractionDigits">fractionDigits</a></div><div class="compBody">
<dl class="props">
<dt><a name="fractionDigits-value" id="fractionDigits-value"><span class="propdef">{value}</span></a></dt><dd>
A <a href="#nonNegativeInteger">nonNegativeInteger</a>.
</dd>
<dt><a name="fractionDigits-fixed" id="fractionDigits-fixed"><span class="propdef">{fixed}</span></a></dt><dd>
A <a href="#boolean">boolean</a>.
</dd>
<dt><a name="fractionDigits-annotation" id="fractionDigits-annotation"><span class="propdef">{annotation}</span></a></dt><dd>
Optional.  An <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#Annotation">annotation</a>.
</dd>
</dl>
</div></div><p>
If <a class="propref" href="#fractionDigits-fixed">{fixed}</a> is <em>true</em>, then types for which
the current type is the <a class="propref" href="#defn-basetype">{base type definition}</a> cannot specify a
value for <a href="#dc-fractionDigits">fractionDigits</a> other than
<a class="propref" href="#fractionDigits-value">{value}</a>.
</p></div><div class="div4">
<h5><a id="xr-fractionDigits" name="xr-fractionDigits"/>4.3.12.2 XML Representation of fractionDigits Schema Components</h5><p>
The XML representation for a <a href="#dc-fractionDigits">fractionDigits</a> schema
component is a <a class="eltref" href="#element-fractionDigits">&lt;fractionDigits&gt;</a> element information item. The
correspondences between the properties of the information item and
properties of the component are as follows:
</p><div class="reprdef"><div class="reprHeader"><span class="reprdef">XML&#xa0;Representation&#xa0;Summary</span>:&#xa0;<code>fractionDigits</code>&#xa0;Element Information Item</div><div class="reprBody">
<p class="element-syntax-1"><a name="element-fractionDigits" id="element-fractionDigits">&lt;fractionDigits</a><br/>&#xa0;&#xa0;fixed = <a href="#boolean">boolean</a>&#xa0;:&#xa0;false<br/>&#xa0;&#xa0;id = <a href="#ID">ID</a><br/>&#xa0;&#xa0;<b>value</b> = <a href="#nonNegativeInteger">nonNegativeInteger</a><br/>&#xa0;&#xa0;<em>{any attributes with non-schema namespace . . .}</em>&gt;<br/><em>&#xa0;&#xa0;Content: </em>(<a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">annotation</a>?)<br/>&lt;/fractionDigits&gt;</p>
<div class="reprcomp"><table class="reprcomp"><thead><tr><th><a href="#dc-fractionDigits">fractionDigits</a><strong>&#xa0;Schema Component</strong></th></tr></thead><tbody><tr><td><table cellpadding="3" border="0"><thead><tr><th align="left">Property</th><th align="left">Representation</th></tr></thead><tbody valign="top"><tr valign="top"><td><a class="propref" href="#fractionDigits-value">{value}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the <code>value</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>
</td></tr><tr valign="top"><td><a class="propref" href="#fractionDigits-fixed">{fixed}</a></td><td>
The <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-vv">actual value</a> of the <code>fixed</code> <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.attribute">[attribute]</a>, if present, otherwise false
</td></tr><tr valign="top"><td><a class="propref" href="#defn-annotation">{annotation}</a></td><td>
The annotations corresponding to all the <a class="eltref" href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-annotation">&lt;annotation&gt;</a>
element information items in the <a class="xpropref" href="http://www.w3.org/TR/xml-infoset/#infoitem.element">[children]</a>, if any.
</td></tr></tbody></table></td></tr></tbody></table></div>
</div></div></div><div class="div4">
<h5><a id="fractionDigits-validation-rules" name="fractionDigits-validation-rules"/>4.3.12.3 fractionDigits Validation Rules</h5><div class="constraintnote"><a name="cvc-fractionDigits-valid" id="cvc-fractionDigits-valid"/><b>Validation Rule:  fractionDigits Valid</b><br/><div class="constraint">
A value in a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> is facet-valid with
respect to <a class="termref" href="#dt-fractionDigits"><span class="arrow">&#xb7;</span>fractionDigits<span class="arrow">&#xb7;</span></a> if:
<div class="constraintlist"><div class="clnumber">1 

that value is expressible as <em>i &#xd7; 10^-n</em> where
<em>i</em> and <em>n</em>
are integers and <em>0 &lt;= n &lt;= <a class="propref" href="#fractionDigits-value">{value}</a></em>.


</div></div></div></div></div><div class="div4">
<h5><a id="fractionDigits-coss" name="fractionDigits-coss"/>4.3.12.4 Constraints on fractionDigits Schema Components</h5><div class="constraintnote"><a name="fractionDigits-totalDigits" id="fractionDigits-totalDigits"/><b>Schema Component Constraint:  fractionDigits less than or equal to totalDigits</b><br/><div class="constraint">
It is an <a class="termref" href="#dt-error"><span class="arrow">&#xb7;</span>error<span class="arrow">&#xb7;</span></a> for <a class="termref" href="#dt-fractionDigits"><span class="arrow">&#xb7;</span>fractionDigits<span class="arrow">&#xb7;</span></a> to
be greater than <a class="termref" href="#dt-totalDigits"><span class="arrow">&#xb7;</span>totalDigits<span class="arrow">&#xb7;</span></a>.
</div></div><div class="constraintnote"><a name="fractionDigits-valid-restriction" id="fractionDigits-valid-restriction"/><b>Schema Component Constraint:  fractionDigits valid restriction</b><br/><div class="constraint">
It is an <a class="termref" href="#dt-error"><span class="arrow">&#xb7;</span>error<span class="arrow">&#xb7;</span></a> if <a class="termref" href="#dt-fractionDigits"><span class="arrow">&#xb7;</span>fractionDigits<span class="arrow">&#xb7;</span></a>
is among the members of <a class="propref" href="#defn-facets">{facets}</a> of <a class="propref" href="#defn-basetype">{base type definition}</a> and
<a class="propref" href="#fractionDigits-value">{value}</a> is greater than the <a class="propref" href="#fractionDigits-value">{value}</a> of the parent
<a class="termref" href="#dt-fractionDigits"><span class="arrow">&#xb7;</span>fractionDigits<span class="arrow">&#xb7;</span></a>.
</div></div></div></div></div></div><div class="div1">
<h2><a id="conformance" name="conformance"/>5 Conformance</h2><p>
This specification describes two levels of conformance for
datatype processors.  The first is
required of all processors.  Support for the other will depend on the
application environments for which the processor is intended.
</p><p>
<span class="termdef"><a id="dt-minimally-conforming" name="dt-minimally-conforming">[Definition:]&#xa0;&#xa0;</a>
<b>Minimally conforming</b> processors <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a>
completely and correctly implement the <a class="termref" href="#dt-cos"><span class="arrow">&#xb7;</span>Constraint on Schemas<span class="arrow">&#xb7;</span></a> and
<a class="termref" href="#dt-cvc"><span class="arrow">&#xb7;</span>Validation Rule<span class="arrow">&#xb7;</span></a>
.
</span>
</p><p>
<span class="termdef"><a id="dt-interchange" name="dt-interchange">[Definition:]&#xa0;&#xa0;</a>
Processors which accept schemas in the form of XML documents as described
in <a href="#xr-defn">XML Representation of Simple Type Definition Schema Components (&#xa7;4.1.2)</a> (and other relevant portions of
<a href="#datatype-components">Datatype components (&#xa7;4)</a>) are additionally said to provide
<b>conformance to the XML Representation of Schemas</b>,
and <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a>, when processing schema documents, completely and
correctly implement all
<a class="termref" href="#dt-src"><span class="arrow">&#xb7;</span>Schema Representation Constraint<span class="arrow">&#xb7;</span></a>s
in this specification, and <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> adhere exactly to the
specifications in <a href="#xr-defn">XML Representation of Simple Type Definition Schema Components (&#xa7;4.1.2)</a>  (and other relevant portions of
<a href="#datatype-components">Datatype components (&#xa7;4)</a>) for mapping
the contents of such
documents to <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-component">schema components</a>
for use in validation.
</span>
</p><div class="note"><b>Note:&#xa0;</b>
By separating the conformance requirements relating to the concrete
syntax of XML schema documents, this specification admits processors
which validate using schemas stored in optimized binary representations,
dynamically created schemas represented as programming language data
structures, or implementations in which particular schemas are compiled
into executable code such as C or Java.  Such processors can be said to
be <a class="termref" href="#dt-minimally-conforming"><span class="arrow">&#xb7;</span>minimally conforming<span class="arrow">&#xb7;</span></a>
but not necessarily in <a class="termref" href="#dt-interchange"><span class="arrow">&#xb7;</span>conformance to
the XML Representation of Schemas<span class="arrow">&#xb7;</span></a>.
</div></div></div><div class="back"><div class="div1">
<h2><a id="schema" name="schema"/>A Schema for Datatype Definitions (normative)</h2><pre>&lt;!DOCTYPE xs:schema PUBLIC &quot;-//W3C//DTD XMLSCHEMA 200102//EN&quot; &quot;XMLSchema.dtd&quot; [

&lt;!--
     keep this schema XML1.0 DTD valid
  --&gt;
        &lt;!ENTITY % schemaAttrs 'xmlns:hfp CDATA #IMPLIED'&gt;

        &lt;!ELEMENT hfp:hasFacet EMPTY&gt;
        &lt;!ATTLIST hfp:hasFacet
                name NMTOKEN #REQUIRED&gt;

        &lt;!ELEMENT hfp:hasProperty EMPTY&gt;
        &lt;!ATTLIST hfp:hasProperty
                name NMTOKEN #REQUIRED
                value CDATA #REQUIRED&gt;
&lt;!--
        Make sure that processors that do not read the external
        subset will know about the various IDs we declare
  --&gt;
        &lt;!ATTLIST xs:simpleType id ID #IMPLIED&gt;
        &lt;!ATTLIST xs:maxExclusive id ID #IMPLIED&gt;
        &lt;!ATTLIST xs:minExclusive id ID #IMPLIED&gt;
        &lt;!ATTLIST xs:maxInclusive id ID #IMPLIED&gt;
        &lt;!ATTLIST xs:minInclusive id ID #IMPLIED&gt;
        &lt;!ATTLIST xs:totalDigits id ID #IMPLIED&gt;
        &lt;!ATTLIST xs:fractionDigits id ID #IMPLIED&gt;
        &lt;!ATTLIST xs:length id ID #IMPLIED&gt;
        &lt;!ATTLIST xs:minLength id ID #IMPLIED&gt;
        &lt;!ATTLIST xs:maxLength id ID #IMPLIED&gt;
        &lt;!ATTLIST xs:enumeration id ID #IMPLIED&gt;
        &lt;!ATTLIST xs:pattern id ID #IMPLIED&gt;
        &lt;!ATTLIST xs:appinfo id ID #IMPLIED&gt;
        &lt;!ATTLIST xs:documentation id ID #IMPLIED&gt;
        &lt;!ATTLIST xs:list id ID #IMPLIED&gt;
        &lt;!ATTLIST xs:union id ID #IMPLIED&gt;
        ]&gt;

&lt;?xml version='1.0'?&gt;
&lt;xs:schema xmlns:hfp=&quot;http://www.w3.org/2001/XMLSchema-hasFacetAndProperty&quot;
           xmlns:xs=&quot;http://www.w3.org/2001/XMLSchema&quot; blockDefault=&quot;#all&quot;
           elementFormDefault=&quot;qualified&quot; xml:lang=&quot;en&quot;
           targetNamespace=&quot;http://www.w3.org/2001/XMLSchema&quot;
           version=&quot;Id: datatypes.xsd,v 1.4 2004/05/29 10:26:33 ht Exp &quot;&gt;
  &lt;xs:annotation&gt;
    &lt;xs:documentation source=&quot;../datatypes/datatypes-with-errata.html&quot;&gt;
      The schema corresponding to this document is normative,
      with respect to the syntactic constraints it expresses in the
      XML Schema language.  The documentation (within &amp;lt;documentation&gt;
      elements) below, is not normative, but rather highlights important
      aspects of the W3C Recommendation of which this is a part
    &lt;/xs:documentation&gt;
  &lt;/xs:annotation&gt;
  &lt;xs:annotation&gt;
    &lt;xs:documentation&gt;
      First the built-in primitive datatypes.  These definitions are for
      information only, the real built-in definitions are magic.
    &lt;/xs:documentation&gt;
    &lt;xs:documentation&gt;
      For each built-in datatype in this schema (both primitive and
      derived) can be uniquely addressed via a URI constructed
      as follows:
        1) the base URI is the URI of the XML Schema namespace
        2) the fragment identifier is the name of the datatype

      For example, to address the int datatype, the URI is:

        http://www.w3.org/2001/XMLSchema#int

      Additionally, each facet definition element can be uniquely
      addressed via a URI constructed as follows:
        1) the base URI is the URI of the XML Schema namespace
        2) the fragment identifier is the name of the facet

      For example, to address the maxInclusive facet, the URI is:

        http://www.w3.org/2001/XMLSchema#maxInclusive

      Additionally, each facet usage in a built-in datatype definition
      can be uniquely addressed via a URI constructed as follows:
        1) the base URI is the URI of the XML Schema namespace
        2) the fragment identifier is the name of the datatype, followed
           by a period (&quot;.&quot;) followed by the name of the facet

      For example, to address the usage of the maxInclusive facet in
      the definition of int, the URI is:

        http://www.w3.org/2001/XMLSchema#int.maxInclusive

    &lt;/xs:documentation&gt;
  &lt;/xs:annotation&gt;
  &lt;xs:simpleType name=&quot;string&quot; id=&quot;string&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:appinfo&gt;
        &lt;hfp:hasFacet name=&quot;length&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minLength&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxLength&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;pattern&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;enumeration&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;whiteSpace&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;ordered&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;bounded&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;cardinality&quot; value=&quot;countably infinite&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;numeric&quot; value=&quot;false&quot;/&gt;
      &lt;/xs:appinfo&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#string&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:anySimpleType&quot;&gt;
      &lt;xs:whiteSpace value=&quot;preserve&quot; id=&quot;string.preserve&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;boolean&quot; id=&quot;boolean&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:appinfo&gt;
        &lt;hfp:hasFacet name=&quot;pattern&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;whiteSpace&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;ordered&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;bounded&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;cardinality&quot; value=&quot;finite&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;numeric&quot; value=&quot;false&quot;/&gt;
      &lt;/xs:appinfo&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#boolean&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:anySimpleType&quot;&gt;
      &lt;xs:whiteSpace fixed=&quot;true&quot; value=&quot;collapse&quot; id=&quot;boolean.whiteSpace&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;float&quot; id=&quot;float&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:appinfo&gt;
        &lt;hfp:hasFacet name=&quot;pattern&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;enumeration&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;whiteSpace&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxInclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxExclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minInclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minExclusive&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;ordered&quot; value=&quot;partial&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;bounded&quot; value=&quot;true&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;cardinality&quot; value=&quot;finite&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;numeric&quot; value=&quot;true&quot;/&gt;
      &lt;/xs:appinfo&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#float&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:anySimpleType&quot;&gt;
      &lt;xs:whiteSpace fixed=&quot;true&quot; value=&quot;collapse&quot; id=&quot;float.whiteSpace&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;double&quot; id=&quot;double&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:appinfo&gt;
        &lt;hfp:hasFacet name=&quot;pattern&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;enumeration&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;whiteSpace&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxInclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxExclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minInclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minExclusive&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;ordered&quot; value=&quot;partial&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;bounded&quot; value=&quot;true&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;cardinality&quot; value=&quot;finite&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;numeric&quot; value=&quot;true&quot;/&gt;
      &lt;/xs:appinfo&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#double&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:anySimpleType&quot;&gt;
      &lt;xs:whiteSpace fixed=&quot;true&quot; value=&quot;collapse&quot; id=&quot;double.whiteSpace&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;decimal&quot; id=&quot;decimal&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:appinfo&gt;
        &lt;hfp:hasFacet name=&quot;totalDigits&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;fractionDigits&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;pattern&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;whiteSpace&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;enumeration&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxInclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxExclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minInclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minExclusive&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;ordered&quot; value=&quot;total&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;bounded&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;cardinality&quot; value=&quot;countably infinite&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;numeric&quot; value=&quot;true&quot;/&gt;
      &lt;/xs:appinfo&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#decimal&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:anySimpleType&quot;&gt;
      &lt;xs:whiteSpace fixed=&quot;true&quot; value=&quot;collapse&quot; id=&quot;decimal.whiteSpace&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;duration&quot; id=&quot;duration&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:appinfo&gt;
        &lt;hfp:hasFacet name=&quot;pattern&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;enumeration&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;whiteSpace&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxInclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxExclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minInclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minExclusive&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;ordered&quot; value=&quot;partial&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;bounded&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;cardinality&quot; value=&quot;countably infinite&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;numeric&quot; value=&quot;false&quot;/&gt;
      &lt;/xs:appinfo&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#duration&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:anySimpleType&quot;&gt;
      &lt;xs:whiteSpace fixed=&quot;true&quot; value=&quot;collapse&quot; id=&quot;duration.whiteSpace&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;dateTime&quot; id=&quot;dateTime&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:appinfo&gt;
        &lt;hfp:hasFacet name=&quot;pattern&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;enumeration&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;whiteSpace&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxInclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxExclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minInclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minExclusive&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;ordered&quot; value=&quot;partial&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;bounded&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;cardinality&quot; value=&quot;countably infinite&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;numeric&quot; value=&quot;false&quot;/&gt;
      &lt;/xs:appinfo&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#dateTime&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:anySimpleType&quot;&gt;
      &lt;xs:whiteSpace fixed=&quot;true&quot; value=&quot;collapse&quot; id=&quot;dateTime.whiteSpace&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;time&quot; id=&quot;time&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:appinfo&gt;
        &lt;hfp:hasFacet name=&quot;pattern&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;enumeration&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;whiteSpace&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxInclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxExclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minInclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minExclusive&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;ordered&quot; value=&quot;partial&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;bounded&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;cardinality&quot; value=&quot;countably infinite&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;numeric&quot; value=&quot;false&quot;/&gt;
      &lt;/xs:appinfo&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#time&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:anySimpleType&quot;&gt;
      &lt;xs:whiteSpace fixed=&quot;true&quot; value=&quot;collapse&quot; id=&quot;time.whiteSpace&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;date&quot; id=&quot;date&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:appinfo&gt;
        &lt;hfp:hasFacet name=&quot;pattern&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;enumeration&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;whiteSpace&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxInclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxExclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minInclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minExclusive&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;ordered&quot; value=&quot;partial&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;bounded&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;cardinality&quot; value=&quot;countably infinite&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;numeric&quot; value=&quot;false&quot;/&gt;
      &lt;/xs:appinfo&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#date&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:anySimpleType&quot;&gt;
      &lt;xs:whiteSpace fixed=&quot;true&quot; value=&quot;collapse&quot; id=&quot;date.whiteSpace&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;gYearMonth&quot; id=&quot;gYearMonth&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:appinfo&gt;
        &lt;hfp:hasFacet name=&quot;pattern&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;enumeration&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;whiteSpace&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxInclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxExclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minInclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minExclusive&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;ordered&quot; value=&quot;partial&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;bounded&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;cardinality&quot; value=&quot;countably infinite&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;numeric&quot; value=&quot;false&quot;/&gt;
      &lt;/xs:appinfo&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#gYearMonth&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:anySimpleType&quot;&gt;
      &lt;xs:whiteSpace fixed=&quot;true&quot; value=&quot;collapse&quot; id=&quot;gYearMonth.whiteSpace&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;gYear&quot; id=&quot;gYear&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:appinfo&gt;
        &lt;hfp:hasFacet name=&quot;pattern&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;enumeration&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;whiteSpace&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxInclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxExclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minInclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minExclusive&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;ordered&quot; value=&quot;partial&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;bounded&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;cardinality&quot; value=&quot;countably infinite&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;numeric&quot; value=&quot;false&quot;/&gt;
      &lt;/xs:appinfo&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#gYear&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:anySimpleType&quot;&gt;
      &lt;xs:whiteSpace fixed=&quot;true&quot; value=&quot;collapse&quot; id=&quot;gYear.whiteSpace&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;gMonthDay&quot; id=&quot;gMonthDay&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:appinfo&gt;
        &lt;hfp:hasFacet name=&quot;pattern&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;enumeration&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;whiteSpace&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxInclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxExclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minInclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minExclusive&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;ordered&quot; value=&quot;partial&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;bounded&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;cardinality&quot; value=&quot;countably infinite&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;numeric&quot; value=&quot;false&quot;/&gt;
      &lt;/xs:appinfo&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#gMonthDay&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:anySimpleType&quot;&gt;
      &lt;xs:whiteSpace fixed=&quot;true&quot; value=&quot;collapse&quot; id=&quot;gMonthDay.whiteSpace&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;gDay&quot; id=&quot;gDay&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:appinfo&gt;
        &lt;hfp:hasFacet name=&quot;pattern&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;enumeration&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;whiteSpace&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxInclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxExclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minInclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minExclusive&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;ordered&quot; value=&quot;partial&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;bounded&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;cardinality&quot; value=&quot;countably infinite&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;numeric&quot; value=&quot;false&quot;/&gt;
      &lt;/xs:appinfo&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#gDay&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:anySimpleType&quot;&gt;
      &lt;xs:whiteSpace fixed=&quot;true&quot; value=&quot;collapse&quot; id=&quot;gDay.whiteSpace&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;gMonth&quot; id=&quot;gMonth&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:appinfo&gt;
        &lt;hfp:hasFacet name=&quot;pattern&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;enumeration&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;whiteSpace&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxInclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxExclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minInclusive&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minExclusive&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;ordered&quot; value=&quot;partial&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;bounded&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;cardinality&quot; value=&quot;countably infinite&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;numeric&quot; value=&quot;false&quot;/&gt;
      &lt;/xs:appinfo&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#gMonth&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:anySimpleType&quot;&gt;
      &lt;xs:whiteSpace fixed=&quot;true&quot; value=&quot;collapse&quot; id=&quot;gMonth.whiteSpace&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;hexBinary&quot; id=&quot;hexBinary&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:appinfo&gt;
        &lt;hfp:hasFacet name=&quot;length&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minLength&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxLength&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;pattern&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;enumeration&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;whiteSpace&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;ordered&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;bounded&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;cardinality&quot; value=&quot;countably infinite&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;numeric&quot; value=&quot;false&quot;/&gt;
      &lt;/xs:appinfo&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#binary&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:anySimpleType&quot;&gt;
      &lt;xs:whiteSpace fixed=&quot;true&quot; value=&quot;collapse&quot; id=&quot;hexBinary.whiteSpace&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;base64Binary&quot; id=&quot;base64Binary&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:appinfo&gt;
        &lt;hfp:hasFacet name=&quot;length&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minLength&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxLength&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;pattern&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;enumeration&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;whiteSpace&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;ordered&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;bounded&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;cardinality&quot; value=&quot;countably infinite&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;numeric&quot; value=&quot;false&quot;/&gt;
      &lt;/xs:appinfo&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#base64Binary&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:anySimpleType&quot;&gt;
      &lt;xs:whiteSpace fixed=&quot;true&quot; value=&quot;collapse&quot; id=&quot;base64Binary.whiteSpace&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;anyURI&quot; id=&quot;anyURI&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:appinfo&gt;
        &lt;hfp:hasFacet name=&quot;length&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minLength&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxLength&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;pattern&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;enumeration&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;whiteSpace&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;ordered&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;bounded&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;cardinality&quot; value=&quot;countably infinite&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;numeric&quot; value=&quot;false&quot;/&gt;
      &lt;/xs:appinfo&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#anyURI&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:anySimpleType&quot;&gt;
      &lt;xs:whiteSpace fixed=&quot;true&quot; value=&quot;collapse&quot; id=&quot;anyURI.whiteSpace&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;QName&quot; id=&quot;QName&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:appinfo&gt;
        &lt;hfp:hasFacet name=&quot;length&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minLength&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxLength&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;pattern&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;enumeration&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;whiteSpace&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;ordered&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;bounded&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;cardinality&quot; value=&quot;countably infinite&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;numeric&quot; value=&quot;false&quot;/&gt;
      &lt;/xs:appinfo&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#QName&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:anySimpleType&quot;&gt;
      &lt;xs:whiteSpace fixed=&quot;true&quot; value=&quot;collapse&quot; id=&quot;QName.whiteSpace&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;NOTATION&quot; id=&quot;NOTATION&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:appinfo&gt;
        &lt;hfp:hasFacet name=&quot;length&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minLength&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxLength&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;pattern&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;enumeration&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;whiteSpace&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;ordered&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;bounded&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;cardinality&quot; value=&quot;countably infinite&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;numeric&quot; value=&quot;false&quot;/&gt;
      &lt;/xs:appinfo&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#NOTATION&quot;/&gt;
      &lt;xs:documentation&gt;
        NOTATION cannot be used directly in a schema; rather a type
        must be derived from it by specifying at least one enumeration
        facet whose value is the name of a NOTATION declared in the
        schema.
      &lt;/xs:documentation&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:anySimpleType&quot;&gt;
      &lt;xs:whiteSpace fixed=&quot;true&quot; value=&quot;collapse&quot; id=&quot;NOTATION.whiteSpace&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:annotation&gt;
    &lt;xs:documentation&gt;
      Now the derived primitive types
    &lt;/xs:documentation&gt;
  &lt;/xs:annotation&gt;
  &lt;xs:simpleType name=&quot;normalizedString&quot; id=&quot;normalizedString&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation
           source=&quot;http://www.w3.org/TR/xmlschema-2/#normalizedString&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:string&quot;&gt;
      &lt;xs:whiteSpace value=&quot;replace&quot; id=&quot;normalizedString.whiteSpace&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;token&quot; id=&quot;token&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#token&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:normalizedString&quot;&gt;
      &lt;xs:whiteSpace value=&quot;collapse&quot; id=&quot;token.whiteSpace&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;language&quot; id=&quot;language&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#language&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:token&quot;&gt;
      &lt;xs:pattern value=&quot;[a-zA-Z]{1,8}(-[a-zA-Z0-9]{1,8})*&quot;
                  id=&quot;language.pattern&quot;&gt;
        &lt;xs:annotation&gt;
          &lt;xs:documentation source=&quot;http://www.ietf.org/rfc/rfc3066.txt&quot;&gt;
            pattern specifies the content of section 2.12 of XML 1.0e2
            and RFC 3066 (Revised version of RFC 1766).
          &lt;/xs:documentation&gt;
        &lt;/xs:annotation&gt;
      &lt;/xs:pattern&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;IDREFS&quot; id=&quot;IDREFS&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:appinfo&gt;
        &lt;hfp:hasFacet name=&quot;length&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minLength&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxLength&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;enumeration&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;whiteSpace&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;pattern&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;ordered&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;bounded&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;cardinality&quot; value=&quot;countably infinite&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;numeric&quot; value=&quot;false&quot;/&gt;
      &lt;/xs:appinfo&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#IDREFS&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction&gt;
      &lt;xs:simpleType&gt;
        &lt;xs:list itemType=&quot;xs:IDREF&quot;/&gt;
      &lt;/xs:simpleType&gt;
      &lt;xs:minLength value=&quot;1&quot; id=&quot;IDREFS.minLength&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;ENTITIES&quot; id=&quot;ENTITIES&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:appinfo&gt;
        &lt;hfp:hasFacet name=&quot;length&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minLength&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxLength&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;enumeration&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;whiteSpace&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;pattern&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;ordered&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;bounded&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;cardinality&quot; value=&quot;countably infinite&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;numeric&quot; value=&quot;false&quot;/&gt;
      &lt;/xs:appinfo&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#ENTITIES&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction&gt;
      &lt;xs:simpleType&gt;
        &lt;xs:list itemType=&quot;xs:ENTITY&quot;/&gt;
      &lt;/xs:simpleType&gt;
      &lt;xs:minLength value=&quot;1&quot; id=&quot;ENTITIES.minLength&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;NMTOKEN&quot; id=&quot;NMTOKEN&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#NMTOKEN&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:token&quot;&gt;
      &lt;xs:pattern value=&quot;\c+&quot; id=&quot;NMTOKEN.pattern&quot;&gt;
        &lt;xs:annotation&gt;
          &lt;xs:documentation source=&quot;http://www.w3.org/TR/REC-xml#NT-Nmtoken&quot;&gt;
            pattern matches production 7 from the XML spec
          &lt;/xs:documentation&gt;
        &lt;/xs:annotation&gt;
      &lt;/xs:pattern&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;NMTOKENS&quot; id=&quot;NMTOKENS&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:appinfo&gt;
        &lt;hfp:hasFacet name=&quot;length&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;minLength&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;maxLength&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;enumeration&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;whiteSpace&quot;/&gt;
        &lt;hfp:hasFacet name=&quot;pattern&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;ordered&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;bounded&quot; value=&quot;false&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;cardinality&quot; value=&quot;countably infinite&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;numeric&quot; value=&quot;false&quot;/&gt;
      &lt;/xs:appinfo&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#NMTOKENS&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction&gt;
      &lt;xs:simpleType&gt;
        &lt;xs:list itemType=&quot;xs:NMTOKEN&quot;/&gt;
      &lt;/xs:simpleType&gt;
      &lt;xs:minLength value=&quot;1&quot; id=&quot;NMTOKENS.minLength&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;Name&quot; id=&quot;Name&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#Name&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:token&quot;&gt;
      &lt;xs:pattern value=&quot;\i\c*&quot; id=&quot;Name.pattern&quot;&gt;
        &lt;xs:annotation&gt;
          &lt;xs:documentation source=&quot;http://www.w3.org/TR/REC-xml#NT-Name&quot;&gt;
            pattern matches production 5 from the XML spec
          &lt;/xs:documentation&gt;
        &lt;/xs:annotation&gt;
      &lt;/xs:pattern&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;NCName&quot; id=&quot;NCName&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#NCName&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:Name&quot;&gt;
      &lt;xs:pattern value=&quot;[\i-[:]][\c-[:]]*&quot; id=&quot;NCName.pattern&quot;&gt;
        &lt;xs:annotation&gt;
          &lt;xs:documentation
               source=&quot;http://www.w3.org/TR/REC-xml-names/#NT-NCName&quot;&gt;
            pattern matches production 4 from the Namespaces in XML spec
          &lt;/xs:documentation&gt;
        &lt;/xs:annotation&gt;
      &lt;/xs:pattern&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;ID&quot; id=&quot;ID&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#ID&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:NCName&quot;/&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;IDREF&quot; id=&quot;IDREF&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#IDREF&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:NCName&quot;/&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;ENTITY&quot; id=&quot;ENTITY&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#ENTITY&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:NCName&quot;/&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;integer&quot; id=&quot;integer&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#integer&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:decimal&quot;&gt;
      &lt;xs:fractionDigits fixed=&quot;true&quot; value=&quot;0&quot; id=&quot;integer.fractionDigits&quot;/&gt;
      &lt;xs:pattern value=&quot;[\-+]?[0-9]+&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;nonPositiveInteger&quot; id=&quot;nonPositiveInteger&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation
           source=&quot;http://www.w3.org/TR/xmlschema-2/#nonPositiveInteger&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:integer&quot;&gt;
      &lt;xs:maxInclusive value=&quot;0&quot; id=&quot;nonPositiveInteger.maxInclusive&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;negativeInteger&quot; id=&quot;negativeInteger&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation
           source=&quot;http://www.w3.org/TR/xmlschema-2/#negativeInteger&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:nonPositiveInteger&quot;&gt;
      &lt;xs:maxInclusive value=&quot;-1&quot; id=&quot;negativeInteger.maxInclusive&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;long&quot; id=&quot;long&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:appinfo&gt;
        &lt;hfp:hasProperty name=&quot;bounded&quot; value=&quot;true&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;cardinality&quot; value=&quot;finite&quot;/&gt;
      &lt;/xs:appinfo&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#long&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:integer&quot;&gt;
      &lt;xs:minInclusive value=&quot;-9223372036854775808&quot; id=&quot;long.minInclusive&quot;/&gt;
      &lt;xs:maxInclusive value=&quot;9223372036854775807&quot; id=&quot;long.maxInclusive&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;int&quot; id=&quot;int&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#int&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:long&quot;&gt;
      &lt;xs:minInclusive value=&quot;-2147483648&quot; id=&quot;int.minInclusive&quot;/&gt;
      &lt;xs:maxInclusive value=&quot;2147483647&quot; id=&quot;int.maxInclusive&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;short&quot; id=&quot;short&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#short&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:int&quot;&gt;
      &lt;xs:minInclusive value=&quot;-32768&quot; id=&quot;short.minInclusive&quot;/&gt;
      &lt;xs:maxInclusive value=&quot;32767&quot; id=&quot;short.maxInclusive&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;byte&quot; id=&quot;byte&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#byte&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:short&quot;&gt;
      &lt;xs:minInclusive value=&quot;-128&quot; id=&quot;byte.minInclusive&quot;/&gt;
      &lt;xs:maxInclusive value=&quot;127&quot; id=&quot;byte.maxInclusive&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;nonNegativeInteger&quot; id=&quot;nonNegativeInteger&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation
           source=&quot;http://www.w3.org/TR/xmlschema-2/#nonNegativeInteger&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:integer&quot;&gt;
      &lt;xs:minInclusive value=&quot;0&quot; id=&quot;nonNegativeInteger.minInclusive&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;unsignedLong&quot; id=&quot;unsignedLong&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:appinfo&gt;
        &lt;hfp:hasProperty name=&quot;bounded&quot; value=&quot;true&quot;/&gt;
        &lt;hfp:hasProperty name=&quot;cardinality&quot; value=&quot;finite&quot;/&gt;
      &lt;/xs:appinfo&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#unsignedLong&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:nonNegativeInteger&quot;&gt;
      &lt;xs:maxInclusive value=&quot;18446744073709551615&quot;
                       id=&quot;unsignedLong.maxInclusive&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;unsignedInt&quot; id=&quot;unsignedInt&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#unsignedInt&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:unsignedLong&quot;&gt;
      &lt;xs:maxInclusive value=&quot;4294967295&quot; id=&quot;unsignedInt.maxInclusive&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;unsignedShort&quot; id=&quot;unsignedShort&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#unsignedShort&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:unsignedInt&quot;&gt;
      &lt;xs:maxInclusive value=&quot;65535&quot; id=&quot;unsignedShort.maxInclusive&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;unsignedByte&quot; id=&quot;unsignedByte&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation source=&quot;http://www.w3.org/TR/xmlschema-2/#unsignedByte&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:unsignedShort&quot;&gt;
      &lt;xs:maxInclusive value=&quot;255&quot; id=&quot;unsignedByte.maxInclusive&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;positiveInteger&quot; id=&quot;positiveInteger&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation
           source=&quot;http://www.w3.org/TR/xmlschema-2/#positiveInteger&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:nonNegativeInteger&quot;&gt;
      &lt;xs:minInclusive value=&quot;1&quot; id=&quot;positiveInteger.minInclusive&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:simpleType name=&quot;derivationControl&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation&gt;
   A utility type, not for public use&lt;/xs:documentation&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:restriction base=&quot;xs:NMTOKEN&quot;&gt;
      &lt;xs:enumeration value=&quot;substitution&quot;/&gt;
      &lt;xs:enumeration value=&quot;extension&quot;/&gt;
      &lt;xs:enumeration value=&quot;restriction&quot;/&gt;
      &lt;xs:enumeration value=&quot;list&quot;/&gt;
      &lt;xs:enumeration value=&quot;union&quot;/&gt;
    &lt;/xs:restriction&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:group name=&quot;simpleDerivation&quot;&gt;
    &lt;xs:choice&gt;
      &lt;xs:element ref=&quot;xs:restriction&quot;/&gt;
      &lt;xs:element ref=&quot;xs:list&quot;/&gt;
      &lt;xs:element ref=&quot;xs:union&quot;/&gt;
    &lt;/xs:choice&gt;
  &lt;/xs:group&gt;
  &lt;xs:simpleType name=&quot;simpleDerivationSet&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation&gt;
   #all or (possibly empty) subset of {restriction, union, list}
   &lt;/xs:documentation&gt;
      &lt;xs:documentation&gt;
   A utility type, not for public use&lt;/xs:documentation&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:union&gt;
      &lt;xs:simpleType&gt;
        &lt;xs:restriction base=&quot;xs:token&quot;&gt;
          &lt;xs:enumeration value=&quot;#all&quot;/&gt;
        &lt;/xs:restriction&gt;
      &lt;/xs:simpleType&gt;
      &lt;xs:simpleType&gt;
        &lt;xs:list&gt;
          &lt;xs:simpleType&gt;
            &lt;xs:restriction base=&quot;xs:derivationControl&quot;&gt;
              &lt;xs:enumeration value=&quot;list&quot;/&gt;
              &lt;xs:enumeration value=&quot;union&quot;/&gt;
              &lt;xs:enumeration value=&quot;restriction&quot;/&gt;
            &lt;/xs:restriction&gt;
          &lt;/xs:simpleType&gt;
        &lt;/xs:list&gt;
      &lt;/xs:simpleType&gt;
    &lt;/xs:union&gt;
  &lt;/xs:simpleType&gt;
  &lt;xs:complexType name=&quot;simpleType&quot; abstract=&quot;true&quot;&gt;
    &lt;xs:complexContent&gt;
      &lt;xs:extension base=&quot;xs:annotated&quot;&gt;
        &lt;xs:group ref=&quot;xs:simpleDerivation&quot;/&gt;
        &lt;xs:attribute name=&quot;final&quot; type=&quot;xs:simpleDerivationSet&quot;/&gt;
        &lt;xs:attribute name=&quot;name&quot; type=&quot;xs:NCName&quot;&gt;
          &lt;xs:annotation&gt;
            &lt;xs:documentation&gt;
              Can be restricted to required or forbidden
            &lt;/xs:documentation&gt;
          &lt;/xs:annotation&gt;
        &lt;/xs:attribute&gt;
      &lt;/xs:extension&gt;
    &lt;/xs:complexContent&gt;
  &lt;/xs:complexType&gt;
  &lt;xs:complexType name=&quot;topLevelSimpleType&quot;&gt;
    &lt;xs:complexContent&gt;
      &lt;xs:restriction base=&quot;xs:simpleType&quot;&gt;
        &lt;xs:sequence&gt;
          &lt;xs:element ref=&quot;xs:annotation&quot; minOccurs=&quot;0&quot;/&gt;
          &lt;xs:group ref=&quot;xs:simpleDerivation&quot;/&gt;
        &lt;/xs:sequence&gt;
        &lt;xs:attribute name=&quot;name&quot; type=&quot;xs:NCName&quot; use=&quot;required&quot;&gt;
          &lt;xs:annotation&gt;
            &lt;xs:documentation&gt;
              Required at the top level
            &lt;/xs:documentation&gt;
          &lt;/xs:annotation&gt;
        &lt;/xs:attribute&gt;
        &lt;xs:anyAttribute namespace=&quot;##other&quot; processContents=&quot;lax&quot;/&gt;
      &lt;/xs:restriction&gt;
    &lt;/xs:complexContent&gt;
  &lt;/xs:complexType&gt;
  &lt;xs:complexType name=&quot;localSimpleType&quot;&gt;
    &lt;xs:complexContent&gt;
      &lt;xs:restriction base=&quot;xs:simpleType&quot;&gt;
        &lt;xs:sequence&gt;
          &lt;xs:element ref=&quot;xs:annotation&quot; minOccurs=&quot;0&quot;/&gt;
          &lt;xs:group ref=&quot;xs:simpleDerivation&quot;/&gt;
        &lt;/xs:sequence&gt;
        &lt;xs:attribute name=&quot;name&quot; use=&quot;prohibited&quot;&gt;
          &lt;xs:annotation&gt;
            &lt;xs:documentation&gt;
              Forbidden when nested
            &lt;/xs:documentation&gt;
          &lt;/xs:annotation&gt;
        &lt;/xs:attribute&gt;
        &lt;xs:attribute name=&quot;final&quot; use=&quot;prohibited&quot;/&gt;
        &lt;xs:anyAttribute namespace=&quot;##other&quot; processContents=&quot;lax&quot;/&gt;
      &lt;/xs:restriction&gt;
    &lt;/xs:complexContent&gt;
  &lt;/xs:complexType&gt;
  &lt;xs:element name=&quot;simpleType&quot; type=&quot;xs:topLevelSimpleType&quot; id=&quot;simpleType&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation
           source=&quot;http://www.w3.org/TR/xmlschema-2/#element-simpleType&quot;/&gt;
    &lt;/xs:annotation&gt;
  &lt;/xs:element&gt;
  &lt;xs:group name=&quot;facets&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation&gt;
       We should use a substitution group for facets, but
       that's ruled out because it would allow users to
       add their own, which we're not ready for yet.
    &lt;/xs:documentation&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:choice&gt;
      &lt;xs:element ref=&quot;xs:minExclusive&quot;/&gt;
      &lt;xs:element ref=&quot;xs:minInclusive&quot;/&gt;
      &lt;xs:element ref=&quot;xs:maxExclusive&quot;/&gt;
      &lt;xs:element ref=&quot;xs:maxInclusive&quot;/&gt;
      &lt;xs:element ref=&quot;xs:totalDigits&quot;/&gt;
      &lt;xs:element ref=&quot;xs:fractionDigits&quot;/&gt;
      &lt;xs:element ref=&quot;xs:length&quot;/&gt;
      &lt;xs:element ref=&quot;xs:minLength&quot;/&gt;
      &lt;xs:element ref=&quot;xs:maxLength&quot;/&gt;
      &lt;xs:element ref=&quot;xs:enumeration&quot;/&gt;
      &lt;xs:element ref=&quot;xs:whiteSpace&quot;/&gt;
      &lt;xs:element ref=&quot;xs:pattern&quot;/&gt;
    &lt;/xs:choice&gt;
  &lt;/xs:group&gt;
  &lt;xs:group name=&quot;simpleRestrictionModel&quot;&gt;
    &lt;xs:sequence&gt;
      &lt;xs:element name=&quot;simpleType&quot; type=&quot;xs:localSimpleType&quot; minOccurs=&quot;0&quot;/&gt;
      &lt;xs:group ref=&quot;xs:facets&quot; minOccurs=&quot;0&quot; maxOccurs=&quot;unbounded&quot;/&gt;
    &lt;/xs:sequence&gt;
  &lt;/xs:group&gt;
  &lt;xs:element name=&quot;restriction&quot; id=&quot;restriction&quot;&gt;
    &lt;xs:complexType&gt;
      &lt;xs:annotation&gt;
        &lt;xs:documentation
             source=&quot;http://www.w3.org/TR/xmlschema-2/#element-restriction&quot;&gt;
          base attribute and simpleType child are mutually
          exclusive, but one or other is required
        &lt;/xs:documentation&gt;
      &lt;/xs:annotation&gt;
      &lt;xs:complexContent&gt;
        &lt;xs:extension base=&quot;xs:annotated&quot;&gt;
          &lt;xs:group ref=&quot;xs:simpleRestrictionModel&quot;/&gt;
          &lt;xs:attribute name=&quot;base&quot; type=&quot;xs:QName&quot; use=&quot;optional&quot;/&gt;
        &lt;/xs:extension&gt;
      &lt;/xs:complexContent&gt;
    &lt;/xs:complexType&gt;
  &lt;/xs:element&gt;
  &lt;xs:element name=&quot;list&quot; id=&quot;list&quot;&gt;
    &lt;xs:complexType&gt;
      &lt;xs:annotation&gt;
        &lt;xs:documentation
             source=&quot;http://www.w3.org/TR/xmlschema-2/#element-list&quot;&gt;
          itemType attribute and simpleType child are mutually
          exclusive, but one or other is required
        &lt;/xs:documentation&gt;
      &lt;/xs:annotation&gt;
      &lt;xs:complexContent&gt;
        &lt;xs:extension base=&quot;xs:annotated&quot;&gt;
          &lt;xs:sequence&gt;
            &lt;xs:element name=&quot;simpleType&quot; type=&quot;xs:localSimpleType&quot;
                        minOccurs=&quot;0&quot;/&gt;
          &lt;/xs:sequence&gt;
          &lt;xs:attribute name=&quot;itemType&quot; type=&quot;xs:QName&quot; use=&quot;optional&quot;/&gt;
        &lt;/xs:extension&gt;
      &lt;/xs:complexContent&gt;
    &lt;/xs:complexType&gt;
  &lt;/xs:element&gt;
  &lt;xs:element name=&quot;union&quot; id=&quot;union&quot;&gt;
    &lt;xs:complexType&gt;
      &lt;xs:annotation&gt;
        &lt;xs:documentation
             source=&quot;http://www.w3.org/TR/xmlschema-2/#element-union&quot;&gt;
          memberTypes attribute must be non-empty or there must be
          at least one simpleType child
        &lt;/xs:documentation&gt;
      &lt;/xs:annotation&gt;
      &lt;xs:complexContent&gt;
        &lt;xs:extension base=&quot;xs:annotated&quot;&gt;
          &lt;xs:sequence&gt;
            &lt;xs:element name=&quot;simpleType&quot; type=&quot;xs:localSimpleType&quot;
                        minOccurs=&quot;0&quot; maxOccurs=&quot;unbounded&quot;/&gt;
          &lt;/xs:sequence&gt;
          &lt;xs:attribute name=&quot;memberTypes&quot; use=&quot;optional&quot;&gt;
            &lt;xs:simpleType&gt;
              &lt;xs:list itemType=&quot;xs:QName&quot;/&gt;
            &lt;/xs:simpleType&gt;
          &lt;/xs:attribute&gt;
        &lt;/xs:extension&gt;
      &lt;/xs:complexContent&gt;
    &lt;/xs:complexType&gt;
  &lt;/xs:element&gt;
  &lt;xs:complexType name=&quot;facet&quot;&gt;
    &lt;xs:complexContent&gt;
      &lt;xs:extension base=&quot;xs:annotated&quot;&gt;
        &lt;xs:attribute name=&quot;value&quot; use=&quot;required&quot;/&gt;
        &lt;xs:attribute name=&quot;fixed&quot; type=&quot;xs:boolean&quot; default=&quot;false&quot;
                      use=&quot;optional&quot;/&gt;
      &lt;/xs:extension&gt;
    &lt;/xs:complexContent&gt;
  &lt;/xs:complexType&gt;
  &lt;xs:complexType name=&quot;noFixedFacet&quot;&gt;
    &lt;xs:complexContent&gt;
      &lt;xs:restriction base=&quot;xs:facet&quot;&gt;
        &lt;xs:sequence&gt;
          &lt;xs:element ref=&quot;xs:annotation&quot; minOccurs=&quot;0&quot;/&gt;
        &lt;/xs:sequence&gt;
        &lt;xs:attribute name=&quot;fixed&quot; use=&quot;prohibited&quot;/&gt;
        &lt;xs:anyAttribute namespace=&quot;##other&quot; processContents=&quot;lax&quot;/&gt;
      &lt;/xs:restriction&gt;
    &lt;/xs:complexContent&gt;
  &lt;/xs:complexType&gt;
  &lt;xs:element name=&quot;minExclusive&quot; type=&quot;xs:facet&quot; id=&quot;minExclusive&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation
           source=&quot;http://www.w3.org/TR/xmlschema-2/#element-minExclusive&quot;/&gt;
    &lt;/xs:annotation&gt;
  &lt;/xs:element&gt;
  &lt;xs:element name=&quot;minInclusive&quot; type=&quot;xs:facet&quot; id=&quot;minInclusive&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation
           source=&quot;http://www.w3.org/TR/xmlschema-2/#element-minInclusive&quot;/&gt;
    &lt;/xs:annotation&gt;
  &lt;/xs:element&gt;
  &lt;xs:element name=&quot;maxExclusive&quot; type=&quot;xs:facet&quot; id=&quot;maxExclusive&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation
           source=&quot;http://www.w3.org/TR/xmlschema-2/#element-maxExclusive&quot;/&gt;
    &lt;/xs:annotation&gt;
  &lt;/xs:element&gt;
  &lt;xs:element name=&quot;maxInclusive&quot; type=&quot;xs:facet&quot; id=&quot;maxInclusive&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation
           source=&quot;http://www.w3.org/TR/xmlschema-2/#element-maxInclusive&quot;/&gt;
    &lt;/xs:annotation&gt;
  &lt;/xs:element&gt;
  &lt;xs:complexType name=&quot;numFacet&quot;&gt;
    &lt;xs:complexContent&gt;
      &lt;xs:restriction base=&quot;xs:facet&quot;&gt;
        &lt;xs:sequence&gt;
          &lt;xs:element ref=&quot;xs:annotation&quot; minOccurs=&quot;0&quot;/&gt;
        &lt;/xs:sequence&gt;
        &lt;xs:attribute name=&quot;value&quot; type=&quot;xs:nonNegativeInteger&quot; use=&quot;required&quot;/&gt;
        &lt;xs:anyAttribute namespace=&quot;##other&quot; processContents=&quot;lax&quot;/&gt;
      &lt;/xs:restriction&gt;
    &lt;/xs:complexContent&gt;
  &lt;/xs:complexType&gt;
  &lt;xs:element name=&quot;totalDigits&quot; id=&quot;totalDigits&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation
           source=&quot;http://www.w3.org/TR/xmlschema-2/#element-totalDigits&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:complexType&gt;
      &lt;xs:complexContent&gt;
        &lt;xs:restriction base=&quot;xs:numFacet&quot;&gt;
          &lt;xs:sequence&gt;
            &lt;xs:element ref=&quot;xs:annotation&quot; minOccurs=&quot;0&quot;/&gt;
          &lt;/xs:sequence&gt;
          &lt;xs:attribute name=&quot;value&quot; type=&quot;xs:positiveInteger&quot; use=&quot;required&quot;/&gt;
          &lt;xs:anyAttribute namespace=&quot;##other&quot; processContents=&quot;lax&quot;/&gt;
        &lt;/xs:restriction&gt;
      &lt;/xs:complexContent&gt;
    &lt;/xs:complexType&gt;
  &lt;/xs:element&gt;
  &lt;xs:element name=&quot;fractionDigits&quot; type=&quot;xs:numFacet&quot; id=&quot;fractionDigits&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation
           source=&quot;http://www.w3.org/TR/xmlschema-2/#element-fractionDigits&quot;/&gt;
    &lt;/xs:annotation&gt;
  &lt;/xs:element&gt;
  &lt;xs:element name=&quot;length&quot; type=&quot;xs:numFacet&quot; id=&quot;length&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation
           source=&quot;http://www.w3.org/TR/xmlschema-2/#element-length&quot;/&gt;
    &lt;/xs:annotation&gt;
  &lt;/xs:element&gt;
  &lt;xs:element name=&quot;minLength&quot; type=&quot;xs:numFacet&quot; id=&quot;minLength&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation
           source=&quot;http://www.w3.org/TR/xmlschema-2/#element-minLength&quot;/&gt;
    &lt;/xs:annotation&gt;
  &lt;/xs:element&gt;
  &lt;xs:element name=&quot;maxLength&quot; type=&quot;xs:numFacet&quot; id=&quot;maxLength&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation
           source=&quot;http://www.w3.org/TR/xmlschema-2/#element-maxLength&quot;/&gt;
    &lt;/xs:annotation&gt;
  &lt;/xs:element&gt;
  &lt;xs:element name=&quot;enumeration&quot; type=&quot;xs:noFixedFacet&quot; id=&quot;enumeration&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation
           source=&quot;http://www.w3.org/TR/xmlschema-2/#element-enumeration&quot;/&gt;
    &lt;/xs:annotation&gt;
  &lt;/xs:element&gt;
  &lt;xs:element name=&quot;whiteSpace&quot; id=&quot;whiteSpace&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation
           source=&quot;http://www.w3.org/TR/xmlschema-2/#element-whiteSpace&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:complexType&gt;
      &lt;xs:complexContent&gt;
        &lt;xs:restriction base=&quot;xs:facet&quot;&gt;
          &lt;xs:sequence&gt;
            &lt;xs:element ref=&quot;xs:annotation&quot; minOccurs=&quot;0&quot;/&gt;
          &lt;/xs:sequence&gt;
          &lt;xs:attribute name=&quot;value&quot; use=&quot;required&quot;&gt;
            &lt;xs:simpleType&gt;
              &lt;xs:restriction base=&quot;xs:NMTOKEN&quot;&gt;
                &lt;xs:enumeration value=&quot;preserve&quot;/&gt;
                &lt;xs:enumeration value=&quot;replace&quot;/&gt;
                &lt;xs:enumeration value=&quot;collapse&quot;/&gt;
              &lt;/xs:restriction&gt;
            &lt;/xs:simpleType&gt;
          &lt;/xs:attribute&gt;
          &lt;xs:anyAttribute namespace=&quot;##other&quot; processContents=&quot;lax&quot;/&gt;
        &lt;/xs:restriction&gt;
      &lt;/xs:complexContent&gt;
    &lt;/xs:complexType&gt;
  &lt;/xs:element&gt;
  &lt;xs:element name=&quot;pattern&quot; id=&quot;pattern&quot;&gt;
    &lt;xs:annotation&gt;
      &lt;xs:documentation
           source=&quot;http://www.w3.org/TR/xmlschema-2/#element-pattern&quot;/&gt;
    &lt;/xs:annotation&gt;
    &lt;xs:complexType&gt;
      &lt;xs:complexContent&gt;
        &lt;xs:restriction base=&quot;xs:noFixedFacet&quot;&gt;
          &lt;xs:sequence&gt;
            &lt;xs:element ref=&quot;xs:annotation&quot; minOccurs=&quot;0&quot;/&gt;
          &lt;/xs:sequence&gt;
          &lt;xs:attribute name=&quot;value&quot; type=&quot;xs:string&quot; use=&quot;required&quot;/&gt;
          &lt;xs:anyAttribute namespace=&quot;##other&quot; processContents=&quot;lax&quot;/&gt;
        &lt;/xs:restriction&gt;
      &lt;/xs:complexContent&gt;
    &lt;/xs:complexType&gt;
  &lt;/xs:element&gt;
&lt;/xs:schema&gt;
</pre></div><div class="div1">
<h2><a id="dtd-for-datatypeDefs" name="dtd-for-datatypeDefs"/>B DTD for Datatype Definitions (non-normative)</h2><pre>&lt;!--
        DTD for XML Schemas: Part 2: Datatypes
        Id: datatypes.dtd,v  1.1 2003/08/28 13:30:52 ht Exp 
        Note this DTD is NOT normative, or even definitive.
  --&gt;

&lt;!--
        This DTD cannot be used on its own, it is intended
        only for incorporation in XMLSchema.dtd, q.v.
  --&gt;

&lt;!-- Define all the element names, with optional prefix --&gt;
&lt;!ENTITY % simpleType &quot;%p;simpleType&quot;&gt;
&lt;!ENTITY % restriction &quot;%p;restriction&quot;&gt;
&lt;!ENTITY % list &quot;%p;list&quot;&gt;
&lt;!ENTITY % union &quot;%p;union&quot;&gt;
&lt;!ENTITY % maxExclusive &quot;%p;maxExclusive&quot;&gt;
&lt;!ENTITY % minExclusive &quot;%p;minExclusive&quot;&gt;
&lt;!ENTITY % maxInclusive &quot;%p;maxInclusive&quot;&gt;
&lt;!ENTITY % minInclusive &quot;%p;minInclusive&quot;&gt;
&lt;!ENTITY % totalDigits &quot;%p;totalDigits&quot;&gt;
&lt;!ENTITY % fractionDigits &quot;%p;fractionDigits&quot;&gt;
&lt;!ENTITY % length &quot;%p;length&quot;&gt;
&lt;!ENTITY % minLength &quot;%p;minLength&quot;&gt;
&lt;!ENTITY % maxLength &quot;%p;maxLength&quot;&gt;
&lt;!ENTITY % enumeration &quot;%p;enumeration&quot;&gt;
&lt;!ENTITY % whiteSpace &quot;%p;whiteSpace&quot;&gt;
&lt;!ENTITY % pattern &quot;%p;pattern&quot;&gt;

&lt;!--
        Customisation entities for the ATTLIST of each element
        type. Define one of these if your schema takes advantage
        of the anyAttribute='##other' in the schema for schemas
  --&gt;

&lt;!ENTITY % simpleTypeAttrs &quot;&quot;&gt;
&lt;!ENTITY % restrictionAttrs &quot;&quot;&gt;
&lt;!ENTITY % listAttrs &quot;&quot;&gt;
&lt;!ENTITY % unionAttrs &quot;&quot;&gt;
&lt;!ENTITY % maxExclusiveAttrs &quot;&quot;&gt;
&lt;!ENTITY % minExclusiveAttrs &quot;&quot;&gt;
&lt;!ENTITY % maxInclusiveAttrs &quot;&quot;&gt;
&lt;!ENTITY % minInclusiveAttrs &quot;&quot;&gt;
&lt;!ENTITY % totalDigitsAttrs &quot;&quot;&gt;
&lt;!ENTITY % fractionDigitsAttrs &quot;&quot;&gt;
&lt;!ENTITY % lengthAttrs &quot;&quot;&gt;
&lt;!ENTITY % minLengthAttrs &quot;&quot;&gt;
&lt;!ENTITY % maxLengthAttrs &quot;&quot;&gt;
&lt;!ENTITY % enumerationAttrs &quot;&quot;&gt;
&lt;!ENTITY % whiteSpaceAttrs &quot;&quot;&gt;
&lt;!ENTITY % patternAttrs &quot;&quot;&gt;

&lt;!-- Define some entities for informative use as attribute
        types --&gt;
&lt;!ENTITY % URIref &quot;CDATA&quot;&gt;
&lt;!ENTITY % XPathExpr &quot;CDATA&quot;&gt;
&lt;!ENTITY % QName &quot;NMTOKEN&quot;&gt;
&lt;!ENTITY % QNames &quot;NMTOKENS&quot;&gt;
&lt;!ENTITY % NCName &quot;NMTOKEN&quot;&gt;
&lt;!ENTITY % nonNegativeInteger &quot;NMTOKEN&quot;&gt;
&lt;!ENTITY % boolean &quot;(true|false)&quot;&gt;
&lt;!ENTITY % simpleDerivationSet &quot;CDATA&quot;&gt;
&lt;!--
        #all or space-separated list drawn from derivationChoice
  --&gt;

&lt;!--
        Note that the use of 'facet' below is less restrictive
        than is really intended:  There should in fact be no
        more than one of each of minInclusive, minExclusive,
        maxInclusive, maxExclusive, totalDigits, fractionDigits,
        length, maxLength, minLength within datatype,
        and the min- and max- variants of Inclusive and Exclusive
        are mutually exclusive. On the other hand,  pattern and
        enumeration may repeat.
  --&gt;
&lt;!ENTITY % minBound &quot;(%minInclusive; | %minExclusive;)&quot;&gt;
&lt;!ENTITY % maxBound &quot;(%maxInclusive; | %maxExclusive;)&quot;&gt;
&lt;!ENTITY % bounds &quot;%minBound; | %maxBound;&quot;&gt;
&lt;!ENTITY % numeric &quot;%totalDigits; | %fractionDigits;&quot;&gt;
&lt;!ENTITY % ordered &quot;%bounds; | %numeric;&quot;&gt;
&lt;!ENTITY % unordered
   &quot;%pattern; | %enumeration; | %whiteSpace; | %length; |
   %maxLength; | %minLength;&quot;&gt;
&lt;!ENTITY % facet &quot;%ordered; | %unordered;&quot;&gt;
&lt;!ENTITY % facetAttr 
        &quot;value CDATA #REQUIRED
        id ID #IMPLIED&quot;&gt;
&lt;!ENTITY % fixedAttr &quot;fixed %boolean; #IMPLIED&quot;&gt;
&lt;!ENTITY % facetModel &quot;(%annotation;)?&quot;&gt;
&lt;!ELEMENT %simpleType;
        ((%annotation;)?, (%restriction; | %list; | %union;))&gt;
&lt;!ATTLIST %simpleType;
    name      %NCName; #IMPLIED
    final     %simpleDerivationSet; #IMPLIED
    id        ID       #IMPLIED
    %simpleTypeAttrs;&gt;
&lt;!-- name is required at top level --&gt;
&lt;!ELEMENT %restriction; ((%annotation;)?,
                         (%restriction1; |
                          ((%simpleType;)?,(%facet;)*)),
                         (%attrDecls;))&gt;
&lt;!ATTLIST %restriction;
    base      %QName;                  #IMPLIED
    id        ID       #IMPLIED
    %restrictionAttrs;&gt;
&lt;!--
        base and simpleType child are mutually exclusive,
        one is required.

        restriction is shared between simpleType and
        simpleContent and complexContent (in XMLSchema.xsd).
        restriction1 is for the latter cases, when this
        is restricting a complex type, as is attrDecls.
  --&gt;
&lt;!ELEMENT %list; ((%annotation;)?,(%simpleType;)?)&gt;
&lt;!ATTLIST %list;
    itemType      %QName;             #IMPLIED
    id        ID       #IMPLIED
    %listAttrs;&gt;
&lt;!--
        itemType and simpleType child are mutually exclusive,
        one is required
  --&gt;
&lt;!ELEMENT %union; ((%annotation;)?,(%simpleType;)*)&gt;
&lt;!ATTLIST %union;
    id            ID       #IMPLIED
    memberTypes   %QNames;            #IMPLIED
    %unionAttrs;&gt;
&lt;!--
        At least one item in memberTypes or one simpleType
        child is required
  --&gt;

&lt;!ELEMENT %maxExclusive; %facetModel;&gt;
&lt;!ATTLIST %maxExclusive;
        %facetAttr;
        %fixedAttr;
        %maxExclusiveAttrs;&gt;
&lt;!ELEMENT %minExclusive; %facetModel;&gt;
&lt;!ATTLIST %minExclusive;
        %facetAttr;
        %fixedAttr;
        %minExclusiveAttrs;&gt;

&lt;!ELEMENT %maxInclusive; %facetModel;&gt;
&lt;!ATTLIST %maxInclusive;
        %facetAttr;
        %fixedAttr;
        %maxInclusiveAttrs;&gt;
&lt;!ELEMENT %minInclusive; %facetModel;&gt;
&lt;!ATTLIST %minInclusive;
        %facetAttr;
        %fixedAttr;
        %minInclusiveAttrs;&gt;

&lt;!ELEMENT %totalDigits; %facetModel;&gt;
&lt;!ATTLIST %totalDigits;
        %facetAttr;
        %fixedAttr;
        %totalDigitsAttrs;&gt;
&lt;!ELEMENT %fractionDigits; %facetModel;&gt;
&lt;!ATTLIST %fractionDigits;
        %facetAttr;
        %fixedAttr;
        %fractionDigitsAttrs;&gt;

&lt;!ELEMENT %length; %facetModel;&gt;
&lt;!ATTLIST %length;
        %facetAttr;
        %fixedAttr;
        %lengthAttrs;&gt;
&lt;!ELEMENT %minLength; %facetModel;&gt;
&lt;!ATTLIST %minLength;
        %facetAttr;
        %fixedAttr;
        %minLengthAttrs;&gt;
&lt;!ELEMENT %maxLength; %facetModel;&gt;
&lt;!ATTLIST %maxLength;
        %facetAttr;
        %fixedAttr;
        %maxLengthAttrs;&gt;

&lt;!-- This one can be repeated --&gt;
&lt;!ELEMENT %enumeration; %facetModel;&gt;
&lt;!ATTLIST %enumeration;
        %facetAttr;
        %enumerationAttrs;&gt;

&lt;!ELEMENT %whiteSpace; %facetModel;&gt;
&lt;!ATTLIST %whiteSpace;
        %facetAttr;
        %fixedAttr;
        %whiteSpaceAttrs;&gt;

&lt;!-- This one can be repeated --&gt;
&lt;!ELEMENT %pattern; %facetModel;&gt;
&lt;!ATTLIST %pattern;
        %facetAttr;
        %patternAttrs;&gt;
</pre></div><div class="div1">
<h2><a id="d0e11239" name="d0e11239"/>C Datatypes and Facets</h2><div class="div2">
<h3><span class="nav"> </span><a id="app-fundamental-facets" name="app-fundamental-facets"/>C.1 Fundamental Facets</h3><p>
The following table shows the values of the fundamental facets
for each <a class="termref" href="#dt-built-in"><span class="arrow">&#xb7;</span>built-in<span class="arrow">&#xb7;</span></a> datatype.
</p><table bgcolor="#bedce6" border="1"><tbody><tr><th>&#xa0;</th><th>Datatype</th><th><a href="#dt-ordered">ordered</a></th><th><a href="#dt-bounded">bounded</a></th><th><a href="#dt-cardinality">cardinality</a></th><th><a href="#dt-numeric">numeric</a></th></tr><tr><td rowspan="19"><a href="#dt-primitive">primitive</a></td><td><a href="#string">string</a></td><td>false</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#boolean">boolean</a></td><td>false</td><td>false</td><td>finite</td><td>false</td></tr><tr><td><a href="#float">float</a></td><td>partial</td><td>true</td><td>finite</td><td>true</td></tr><tr><td><a href="#double">double</a></td><td>partial</td><td>true</td><td>finite</td><td>true</td></tr><tr><td><a href="#decimal">decimal</a></td><td>total</td><td>false</td><td>countably infinite</td><td>true</td></tr><tr><td><a href="#duration">duration</a></td><td>partial</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#dateTime">dateTime</a></td><td>partial</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#time">time</a></td><td>partial</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#date">date</a></td><td>partial</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#gYearMonth">gYearMonth</a></td><td>partial</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#gYear">gYear</a></td><td>partial</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#gMonthDay">gMonthDay</a></td><td>partial</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#gDay">gDay</a></td><td>partial</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#gMonth">gMonth</a></td><td>partial</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#hexBinary">hexBinary</a></td><td>false</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#base64Binary">base64Binary</a></td><td>false</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#anyURI">anyURI</a></td><td>false</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#QName">QName</a></td><td>false</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#NOTATION">NOTATION</a></td><td>false</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td colspan="7"/></tr><tr><td rowspan="25"><a href="#dt-derived">derived</a></td><td><a href="#normalizedString">normalizedString</a></td><td>false</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#token">token</a></td><td>false</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#language">language</a></td><td>false</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#IDREFS">IDREFS</a></td><td>false</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#ENTITIES">ENTITIES</a></td><td>false</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#NMTOKEN">NMTOKEN</a></td><td>false</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#NMTOKENS">NMTOKENS</a></td><td>false</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#Name">Name</a></td><td>false</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#NCName">NCName</a></td><td>false</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#ID">ID</a></td><td>false</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#IDREF">IDREF</a></td><td>false</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#ENTITY">ENTITY</a></td><td>false</td><td>false</td><td>countably infinite</td><td>false</td></tr><tr><td><a href="#integer">integer</a></td><td>total</td><td>false</td><td>countably infinite</td><td>true</td></tr><tr><td><a href="#nonPositiveInteger">nonPositiveInteger</a></td><td>total</td><td>false</td><td>countably infinite</td><td>true</td></tr><tr><td><a href="#negativeInteger">negativeInteger</a></td><td>total</td><td>false</td><td>countably infinite</td><td>true</td></tr><tr><td><a href="#long">long</a></td><td>total</td><td>true</td><td>finite</td><td>true</td></tr><tr><td><a href="#int">int</a></td><td>total</td><td>true</td><td>finite</td><td>true</td></tr><tr><td><a href="#short">short</a></td><td>total</td><td>true</td><td>finite</td><td>true</td></tr><tr><td><a href="#byte">byte</a></td><td>total</td><td>true</td><td>finite</td><td>true</td></tr><tr><td><a href="#nonNegativeInteger">nonNegativeInteger</a></td><td>total</td><td>false</td><td>countably infinite</td><td>true</td></tr><tr><td><a href="#unsignedLong">unsignedLong</a></td><td>total</td><td>true</td><td>finite</td><td>true</td></tr><tr><td><a href="#unsignedInt">unsignedInt</a></td><td>total</td><td>true</td><td>finite</td><td>true</td></tr><tr><td><a href="#unsignedShort">unsignedShort</a></td><td>total</td><td>true</td><td>finite</td><td>true</td></tr><tr><td><a href="#unsignedByte">unsignedByte</a></td><td>total</td><td>true</td><td>finite</td><td>true</td></tr><tr><td><a href="#positiveInteger">positiveInteger</a></td><td>total</td><td>false</td><td>countably infinite</td><td>true</td></tr></tbody></table></div></div><div class="div1">
<h2><a id="isoformats" name="isoformats"/>D ISO 8601 Date and Time Formats</h2><div class="div2">
<h3><span class="nav"> <a class="nav" href="#truncatedformats"><img src="next.jpg" alt="next sub-section"/></a></span><a id="formatdetails" name="formatdetails"/>D.1 ISO 8601 Conventions</h3><p>
The <a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a> datatypes
<a href="#duration">duration</a>, <a href="#dateTime">dateTime</a>, <a href="#time">time</a>,
<a href="#date">date</a>, <a href="#gYearMonth">gYearMonth</a>,  <a href="#gMonthDay">gMonthDay</a>,
<a href="#gDay">gDay</a>, <a href="#gMonth">gMonth</a> and <a href="#gYear">gYear</a>
use lexical formats inspired by
<a href="#ISO8601">[ISO 8601]</a>.
Following <a href="#ISO8601">[ISO 8601]</a>, the lexical forms of
these datatypes can include only the characters #20 through #7F.
This appendix provides more detail on the ISO
formats and discusses some deviations from them for the datatypes
defined in this specification.
</p><p>
<a href="#ISO8601">[ISO 8601]</a> &quot;specifies the representation of dates in the
proleptic Gregorian calendar and times and representations of periods of time&quot;.
The proleptic Gregorian calendar includes dates prior to 1582 (the year it came
into use as an ecclesiastical calendar).
It should be pointed out that the datatypes described in this
specification do not cover all the types of data covered by
<a href="#ISO8601">[ISO 8601]</a>, nor do they support all the lexical
representations for those types of data.
</p><p>
<a href="#ISO8601">[ISO 8601]</a> lexical formats are described using &quot;pictures&quot;
in which characters are used in place of decimal digits.
The allowed decimal digits are (#x30-#x39).
For the primitive datatypes
<a href="#dateTime">dateTime</a>, <a href="#time">time</a>,
<a href="#date">date</a>, <a href="#gYearMonth">gYearMonth</a>,  <a href="#gMonthDay">gMonthDay</a>,
<a href="#gDay">gDay</a>, <a href="#gMonth">gMonth</a> and <a href="#gYear">gYear</a>.
these characters have the following meanings:
</p><ul><li>
C -- represents a digit used in the thousands and hundreds components,
the &quot;century&quot; component, of the time element &quot;year&quot;. Legal values are
from 0 to 9.
</li><li>
Y -- represents a digit used in the tens and units components of the time
element &quot;year&quot;.  Legal values are from 0 to 9.
</li><li>
M -- represents a digit used in the time element &quot;month&quot;.  The two
digits in a MM format can have values from 1 to 12.
</li><li>
D -- represents a digit used in the time element &quot;day&quot;. The two digits
in a DD format can have values from 1 to 28 if the month value equals 2,
1 to 29 if the month value equals 2 and the year is a leap year, 1 to 30
if the month value equals 4, 6, 9 or 11, and 1 to 31 if the month value
equals 1, 3, 5, 7, 8, 10 or 12.
</li><li>
h -- represents a digit used in the time element &quot;hour&quot;. The two digits
in a hh format can have values from 0 to
24.

If the value of the hour element is 24 then the values of the minutes
element and the seconds element must be 00 and 00.

</li><li>
m -- represents a digit used in the time element &quot;minute&quot;. The two digits
in a mm format can have values from 0 to 59.
</li><li>
s -- represents a digit used in the time element &quot;second&quot;.  The two
digits in a ss format can have values from 0 to 60.  In the formats
described in this specification the whole number of seconds <a class="termref" href="#dt-may"><span class="arrow">&#xb7;</span>may<span class="arrow">&#xb7;</span></a>
be followed by decimal seconds to an arbitrary level of precision.
This is represented in the picture by &quot;ss.sss&quot;.  A value of 60 or more is
allowed only in the case of leap seconds.  <p/>Strictly speaking, a value of
60 or more is not sensible unless the month and day could
represent March 31, June 30, September 30, or December 31 <em>in UTC</em>.
Because the leap second is added or subtracted as the last second of the day
in UTC time, the long (or short) minute could occur at other times in local
time.  In cases where the leap second is used with an inappropriate month
and day it, and any fractional seconds, should considered as added or
subtracted from the following minute.
</li></ul><p>
For all the information items indicated by the above characters, leading
zeros are required where indicated.
</p><p>
In addition to the above, certain characters are used as designators
and appear as themselves in lexical formats.
</p><ul><li>
T -- is used as time designator to indicate the start of the
representation of the time of day in <a href="#dateTime">dateTime</a>.
</li><li>
Z -- is used as time-zone designator, immediately (without a space)
following a data element expressing the time of day in Coordinated
Universal Time (UTC) in
<a href="#dateTime">dateTime</a>, <a href="#time">time</a>,
<a href="#date">date</a>, <a href="#gYearMonth">gYearMonth</a>,  <a href="#gMonthDay">gMonthDay</a>,
<a href="#gDay">gDay</a>, <a href="#gMonth">gMonth</a>, and <a href="#gYear">gYear</a>.
</li></ul><p>In the lexical format for <a href="#duration">duration</a> the following
characters are also used as designators and appear as themselves in
lexical formats:</p><ul><li>P -- is used as the time duration designator, preceding a data element
representing a given duration of time.</li><li>Y -- follows the number of years in a time duration.</li><li>M -- follows the number of months or minutes in a time duration.</li><li>D -- follows the number of days in a time duration.</li><li>H -- follows the number of hours in a time duration.</li><li>S -- follows the number of seconds in a time duration.</li></ul><p>
The values of the
Year, Month, Day, Hour and Minutes components are not restricted but
allow an arbitrary integer.  Similarly, the value of the Seconds component
allows an arbitrary decimal.  Thus, the lexical format for
<a href="#duration">duration</a> and datatypes derived from it
does not follow the alternative
format of &#xa7; 5.5.3.2.1 of <a href="#ISO8601">[ISO 8601]</a>.</p></div><div class="div2">
<h3><span class="nav"><a class="nav" href="#formatdetails"><img src="previous.jpg" alt="previous sub-section"/></a> <a class="nav" href="#deviantformats"><img src="next.jpg" alt="next sub-section"/></a></span><a id="truncatedformats" name="truncatedformats"/>D.2 Truncated and Reduced Formats</h3><p>
<a href="#ISO8601">[ISO 8601]</a> supports a variety of &quot;truncated&quot; formats in
which some of the characters on the left of specific formats, for example,
the
century, can be omitted.
Truncated formats are, in
general, not permitted for the datatypes defined in this specification
with three exceptions.  The <a href="#time">time</a> datatype uses
a truncated format for <a href="#dateTime">dateTime</a>
which represents an instant of time that recurs every day.
Similarly, the <a href="#gMonthDay">gMonthDay</a> and <a href="#gDay">gDay</a>
datatypes use left-truncated formats for <a href="#date">date</a>.
The datatype <a href="#gMonth">gMonth</a> uses a right and left truncated format for
<a href="#date">date</a>.
</p><p>
<a href="#ISO8601">[ISO 8601]</a> also supports a variety of &quot;reduced&quot; or right-truncated
formats in which some of the characters to the right of specific formats,
such as the
time specification, can be omitted.  Right truncated formats are also, in
general,
not permitted for the datatypes defined in this specification
with the following exceptions:
right-truncated representations of <a href="#dateTime">dateTime</a> are used as
lexical representations for <a href="#date">date</a>,  <a href="#gMonth">gMonth</a>,
<a href="#gYear">gYear</a>.
</p></div><div class="div2">
<h3 class="withToc"><span class="nav"><a class="nav" href="#truncatedformats"><img src="previous.jpg" alt="previous sub-section"/></a> </span><a id="deviantformats" name="deviantformats"/>D.3 Deviations from ISO 8601 Formats</h3><div class="localToc">&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;D.3.1 <a href="#signallowed">Sign Allowed</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;D.3.2 <a href="#noYearZero">No Year Zero</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;D.3.3 <a href="#morethan9999years">More Than 9999 Years</a><br/>
&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;D.3.4 <a href="#timeZonePermited">Time zone permitted</a><br/>
</div><div class="div3">
<h4><a id="signallowed" name="signallowed"/>D.3.1 Sign Allowed</h4><p>
An optional minus sign is allowed immediately preceding, without a space,
the lexical representations for <a href="#duration">duration</a>, <a href="#dateTime">dateTime</a>,
<a href="#date">date</a>, <a href="#gYearMonth">gYearMonth</a>, <a href="#gYear">gYear</a>.
</p></div><div class="div3">
<h4><a id="noYearZero" name="noYearZero"/>D.3.2 No Year Zero</h4><p>
The year &quot;0000&quot; is an illegal year value.
</p></div><div class="div3">
<h4><a id="morethan9999years" name="morethan9999years"/>D.3.3 More Than 9999 Years</h4><p>
To accommodate year values greater than 9999, more than four digits are
allowed in the year representations of <a href="#dateTime">dateTime</a>,
<a href="#date">date</a>, <a href="#gYearMonth">gYearMonth</a>, and <a href="#gYear">gYear</a>.
This follows
<a href="#ISO8601-2000">[ISO 8601:2000 Second Edition]</a>.
</p></div><div class="div3">
<h4><a id="timeZonePermited" name="timeZonePermited"/>D.3.4 Time zone permitted</h4><p>
The lexical representations for the datatypes <a href="#date">date</a>,
<a href="#gYearMonth">gYearMonth</a>, <a href="#gMonthDay">gMonthDay</a>, <a href="#gDay">gDay</a>,
<a href="#gMonth">gMonth</a> and <a href="#gYear">gYear</a> permit an optional
trailing time zone specificiation.
</p></div></div></div><div class="div1">
<h2><a id="adding-durations-to-dateTimes" name="adding-durations-to-dateTimes"/>E Adding durations to dateTimes</h2><p>
Given a <a href="#dateTime">dateTime</a> S and a <a href="#duration">duration</a> D, this
appendix specifies how to compute a <a href="#dateTime">dateTime</a> E where E is the
end of the time period with start S and duration D i.e. E = S + D.  Such
computations are used, for example, to determine whether a <a href="#dateTime">dateTime</a>
is within a specific time period. This appendix also addresses the addition of
<a href="#duration">duration</a>s to the datatypes <a href="#date">date</a>,
<a href="#gYearMonth">gYearMonth</a>, <a href="#gYear">gYear</a>, <a href="#gDay">gDay</a> and
<a href="#gMonth">gMonth</a>, which can be viewed as a set of <a href="#dateTime">dateTime</a>s.
In such cases, the addition is made to the first or starting
<a href="#dateTime">dateTime</a> in the set.
</p><p>
<em>This is a logical explanation of the process.
Actual implementations are free to optimize as long as they produce the same
results. </em> The calculation uses the notation S[year] to represent the year
field of S, S[month] to represent the month field, and so on. It also depends on
the following functions:</p><ul><li>
     	fQuotient(a, b) = the greatest integer less than or equal to a/b
          <ul><li>fQuotient(-1,3) = -1</li><li>fQuotient(0,3)...fQuotient(2,3) = 0</li><li>fQuotient(3,3) = 1</li><li>fQuotient(3.123,3) = 1</li></ul>
     </li><li>
     	modulo(a, b) = a - fQuotient(a,b)*b
          <ul><li>modulo(-1,3) = 2</li><li>modulo(0,3)...modulo(2,3) = 0...2</li><li>modulo(3,3) = 0</li><li>modulo(3.123,3) = 0.123</li></ul>
     </li><li>
     	fQuotient(a, low, high) = fQuotient(a - low, high - low)
          <ul><li>fQuotient(0, 1, 13) = -1</li><li>fQuotient(1, 1, 13) ... fQuotient(12, 1, 13) = 0</li><li>fQuotient(13, 1, 13) = 1</li><li>fQuotient(13.123, 1, 13) = 1</li></ul>
     </li><li>
     	modulo(a, low, high) = modulo(a - low, high - low) + low
          <ul><li>modulo(0, 1, 13) = 12</li><li>modulo(1, 1, 13) ...  modulo(12, 1, 13) = 1...12 </li><li>modulo(13, 1, 13) = 1</li><li>modulo(13.123, 1, 13) = 1.123</li></ul>
     </li><li>
     	maximumDayInMonthFor(yearValue, monthValue) =
          <ul><li>M := modulo(monthValue, 1, 13)</li><li>Y := yearValue + fQuotient(monthValue, 1, 13)</li><li>Return a value based on M and Y:</li></ul>
     </li></ul><p/><table border="1"><tbody><tr><td style="background-color:#FFFF99"><b>31</b></td><td colspan="2">M = January, March, May, July, August, October, or
          December</td></tr><tr><td style="background-color:#FFFF99"><b>30</b></td><td colspan="2">M = April, June, September, or November</td></tr><tr><td style="background-color:#FFFF99"><b>29</b></td><td>M = February AND (modulo(Y, 400) = 0 OR
          (modulo(Y, 100) != 0) AND modulo(Y, 4) = 0)</td></tr><tr><td style="background-color:#FFFF99"><b>28</b></td><td>Otherwise</td></tr></tbody></table><p/><div class="div2">
<h3><span class="nav"> <a class="nav" href="#adding-durations-to-instants-commutativity-associativity"><img src="next.jpg" alt="next sub-section"/></a></span><a id="d0e11648" name="d0e11648"/>E.1 Algorithm</h3><p>
Essentially, this calculation is equivalent to separating D into &lt;year,month&gt;
and &lt;day,hour,minute,second&gt; fields. The &lt;year,month&gt; is added to S.
If the day is out of range, it is <em>pinned</em> to be within range. Thus April
31 turns into April 30. Then the &lt;day,hour,minute,second&gt; is added. This
latter addition can cause the year and month to change.
</p><p>
Leap seconds are handled by the computation by treating them as overflows.
Essentially, a value of 60
seconds in S is treated as if it were a duration of 60 seconds added to S
(with a zero seconds field). All calculations
thereafter use 60 seconds per minute.
</p><p>
Thus the addition of either PT1M or PT60S to any dateTime will always
produce the same result. This is a special definition of addition which
is designed to match common practice, and -- most importantly -- be stable
over time.
</p><p>
A definition that attempted to take leap-seconds into account would need to
be constantly updated, and could not predict the results of future
implementation's additions. The decision to introduce a leap second in UTC
is the responsibility of the <a href="#IERS">[International Earth Rotation Service (IERS)]</a>. They make periodic
announcements as to when
leap seconds are to be added, but this is not known more than a year in
advance. For more information on leap seconds, see <a href="#USNavy">[U.S. Naval Observatory Time Service Department]</a>.
</p><p>
The following is the precise specification. These steps must be followed in
the same order. If a field in D is not specified, it is treated as if it were
zero. If a field in S is not specified, it is treated in the calculation as if
it were the minimum allowed value in that field, however, after the calculation
is concluded, the corresponding field in E is removed (set to unspecified).
</p><ul><li><em>Months (may be modified additionally below)</em>
    <ul><li>temp := S[month] + D[month]</li><li>E[month] := modulo(temp, 1, 13)</li><li>carry := fQuotient(temp, 1, 13)</li></ul>
  </li><li><em>Years (may be modified additionally below)</em>
    <ul><li>E[year] := S[year] + D[year] + carry</li></ul>
  </li><li><em>Zone</em>
    <ul><li>E[zone] := S[zone]</li></ul>
  </li><li><em>Seconds</em>
    <ul><li>temp := S[second] + D[second]</li><li>E[second] := modulo(temp, 60)</li><li>carry := fQuotient(temp, 60)</li></ul>
  </li><li><em>Minutes</em>
    <ul><li>temp := S[minute] + D[minute] + carry</li><li>E[minute] := modulo(temp, 60)</li><li>carry := fQuotient(temp, 60)</li></ul>
  </li><li><em>Hours</em>
    <ul><li>temp := S[hour] + D[hour] + carry</li><li>E[hour] := modulo(temp, 24)</li><li>carry := fQuotient(temp, 24)</li></ul>
  </li><li><em>Days</em>
    <ul><li>if S[day] &gt; maximumDayInMonthFor(E[year], E[month])
        <ul><li>tempDays := maximumDayInMonthFor(E[year], E[month])</li></ul>
      </li><li>else if S[day] &lt; 1
        <ul><li>tempDays := 1</li></ul>
	  </li><li>else
        <ul><li>tempDays := S[day]</li></ul>
      </li><li>E[day] := tempDays + D[day] + carry</li><li><b>START LOOP</b>
        <ul><li><b>IF </b>E[day] &lt; 1
            <ul><li>E[day] := E[day] + maximumDayInMonthFor(E[year], E[month] - 1)</li><li>carry := -1</li></ul>
          </li><li><b>ELSE IF </b>E[day] &gt; maximumDayInMonthFor(E[year], E[month])
            <ul><li>E[day] := E[day] - maximumDayInMonthFor(E[year], E[month])</li><li>carry := 1</li></ul>
          </li><li><b>ELSE EXIT LOOP</b></li><li>temp := E[month] + carry</li><li>E[month] := modulo(temp, 1, 13)</li><li>E[year] := E[year] + fQuotient(temp, 1, 13)</li><li><b>GOTO START LOOP</b></li></ul>
      </li></ul>
  </li></ul><p><em>Examples:</em></p><table cellpadding="4" cellspacing="0" border="1"><tbody><tr><th style="background-color: #FFFF99" align="center">dateTime</th><th style="background-color: #FFFF99" align="center">duration</th><th style="background-color: #FFFF99" align="center">result</th></tr><tr><td align="center">2000-01-12T12:13:14Z</td><td align="center">P1Y3M5DT7H10M3.3S</td><td align="center">2001-04-17T19:23:17.3Z</td></tr><tr><td align="center">2000-01</td><td align="center">-P3M</td><td align="center">1999-10</td></tr><tr><td align="center">2000-01-12</td><td align="center">PT33H</td><td align="center">2000-01-13</td></tr></tbody></table></div><div class="div2">
<h3><span class="nav"><a class="nav" href="#"><img src="previous.jpg" alt="previous sub-section"/></a> </span><a id="adding-durations-to-instants-commutativity-associativity" name="adding-durations-to-instants-commutativity-associativity"/>E.2 Commutativity and Associativity</h3><p>
Time durations are added by simply adding each of their fields, respectively,
without overflow.
</p><p>
The order of addition of durations to instants <em>is</em> significant.
For example, there are cases where:
</p><p>((dateTime + duration1) + duration2) != ((dateTime +
duration2) + duration1)</p><p><em>Example:</em></p><p>(2000-03-30 + P1D) + P1M = 2000-03-31 + P1M = 2000-<b>04-30</b></p><p>(2000-03-30 + P1M) + P1D = 2000-04-30 + P1D = 2000-<b>05-01</b></p></div></div><div class="div1">
<h2><a id="regexs" name="regexs"/>F Regular Expressions</h2><p>
A <a class="termref" href="#dt-regex"><span class="arrow">&#xb7;</span>regular expression<span class="arrow">&#xb7;</span></a>&#xa0;<em>R</em> is a sequence of
characters that denote a <b>set of strings</b>&#xa0; <em>L(R)</em>.
When used to constrain a <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a>, a
<b>regular expression</b>&#xa0; <em>R</em> asserts that only strings
in <em>L(R)</em> are valid literals for values of that type.
</p><div class="note"><b>Note:&#xa0;</b>
Unlike some popular regular expression languages (including those
    defined by Perl and standard Unix utilities), the regular
    expression language defined here implicitly anchors all regular
    expressions at the head and tail, as the most common use of
    regular expressions in <a class="termref" href="#dt-pattern"><span class="arrow">&#xb7;</span>pattern<span class="arrow">&#xb7;</span></a> is to match entire literals.
For example, a datatype <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from <a href="#string">string</a> such
that all values must begin with the character <code>A</code> (#x41) and end with the character
<code>Z</code> (#x5a) would be defined as follows:
<pre>&lt;simpleType name='myString'&gt;
 &lt;restriction base='string'&gt;
  &lt;pattern value='A.*Z'/&gt;
 &lt;/restriction&gt;
&lt;/simpleType&gt;</pre>
In regular expression languages that are not implicitly anchored at the head and tail,
it is customary to write the equivalent regular expression as:
<p/>
&#xa0;&#xa0;&#xa0;<code>^A.*Z$</code>
<p/>
where &quot;^&quot; anchors the pattern at the head and &quot;$&quot; anchors at the tail.
<p/>In those rare cases where an unanchored match is desired, including
<code>.*</code> at the beginning and ending of the regular expression will
achieve the desired results. For example, a datatype <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> from string such that all values must contain at least 3 consecutive <code>A</code> (<code>#x41</code>) characters somewhere within the value could be defined as follows:<pre>&lt;simpleType name='myString'&gt;
 &lt;restriction base='string'&gt;
  &lt;pattern value='.*AAA.*'/&gt;
 &lt;/restriction&gt;
&lt;/simpleType&gt;</pre></div><p>
<span class="termdef"><a id="dt-regex" name="dt-regex">[Definition:]&#xa0;&#xa0;</a>A
<b>regular expression</b> is composed from zero or more
<a class="termref" href="#dt-branch"><span class="arrow">&#xb7;</span>branch<span class="arrow">&#xb7;</span></a>es, separated by <code>|</code> characters.
</span>
</p><table width="100%" border="1" cellpadding="5" class="scrap"><tbody><tr align="left"><td><strong><font color="red">Regular Expression</font></strong></td></tr><tr><td><table border="0"><tbody><tr valign="baseline"><td><a id="regex" name="regex"/><a id="nt-regExp" name="nt-regExp"/>[1]&#xa0;&#xa0;&#xa0;</td><td><code>regExp</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>
			<a href="#nt-branch">branch</a>
			( '|' <a href="#nt-branch">branch</a> )*
		</code></td></tr></tbody></table></td></tr></tbody></table><p/><table border="1"><col span="1" width="50%"/><col span="1" width="50%"/><thead><tr><th>
For all <a class="termref" href="#dt-branch"><span class="arrow">&#xb7;</span>branch<span class="arrow">&#xb7;</span></a>es <em>S</em>, and for all
<a class="termref" href="#dt-regex"><span class="arrow">&#xb7;</span>regular expression<span class="arrow">&#xb7;</span></a>s <em>T</em>, valid
<a class="termref" href="#dt-regex"><span class="arrow">&#xb7;</span>regular expression<span class="arrow">&#xb7;</span></a>s <em>R</em> are:
</th><th>
Denoting the set of strings <em>L(R)</em> containing:
</th></tr></thead><tbody><tr><td align="center">(empty string)</td><td align="center">the set containing just the empty string
</td></tr><tr><td align="center"><em>S</em></td><td align="center">all strings in <em>L(S)</em></td></tr><tr><td align="center"><em>S</em>|<em>T</em></td><td align="center">all strings in <em>L(S)</em> and
  all strings in <em>L(T)</em></td></tr></tbody></table><p>
<span class="termdef"><a id="dt-branch" name="dt-branch">[Definition:]&#xa0;&#xa0;</a>
A <b>branch</b> consists
of zero or more <a class="termref" href="#dt-piece"><span class="arrow">&#xb7;</span>piece<span class="arrow">&#xb7;</span></a>s, concatenated together.
</span>
</p><table width="100%" border="1" cellpadding="5" class="scrap"><tbody><tr align="left"><td><strong><font color="red">Branch</font></strong></td></tr><tr><td><table border="0"><tbody><tr valign="baseline"><td><a id="branch" name="branch"/><a id="nt-branch" name="nt-branch"/>[2]&#xa0;&#xa0;&#xa0;</td><td><code>branch</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code><a href="#nt-piece">piece</a>*</code></td></tr></tbody></table></td></tr></tbody></table><p/><table border="1"><col span="1" width="50%"/><col span="1" width="50%"/><thead><tr><th>
For all <a class="termref" href="#dt-piece"><span class="arrow">&#xb7;</span>piece<span class="arrow">&#xb7;</span></a>s <em>S</em>, and for all
<a class="termref" href="#dt-branch"><span class="arrow">&#xb7;</span>branch<span class="arrow">&#xb7;</span></a>es <em>T</em>, valid
<a class="termref" href="#dt-branch"><span class="arrow">&#xb7;</span>branch<span class="arrow">&#xb7;</span></a>es <em>R</em> are:
</th><th>
Denoting the set of strings <em>L(R)</em> containing:
</th></tr></thead><tbody><tr><td align="center"><em>S</em></td><td align="center">all strings in <em>L(S)</em></td></tr><tr><td align="center"><em>S</em><em>T</em></td><td align="center">all strings <em>st</em> with <em>s</em> in
  <em>L(S)</em> and <em>t</em> in <em>L(T)</em></td></tr></tbody></table><p>
<span class="termdef"><a id="dt-piece" name="dt-piece">[Definition:]&#xa0;&#xa0;</a>
A <b>piece</b> is an
<a class="termref" href="#dt-atom"><span class="arrow">&#xb7;</span>atom<span class="arrow">&#xb7;</span></a>, possibly followed by a
<a class="termref" href="#dt-quantifier"><span class="arrow">&#xb7;</span>quantifier<span class="arrow">&#xb7;</span></a>.
</span>
</p><table width="100%" border="1" cellpadding="5" class="scrap"><tbody><tr align="left"><td><strong><font color="red">Piece</font></strong></td></tr><tr><td><table border="0"><tbody><tr valign="baseline"><td><a id="piece" name="piece"/><a id="nt-piece" name="nt-piece"/>[3]&#xa0;&#xa0;&#xa0;</td><td><code>piece</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code><a href="#nt-atom">atom</a>&#xa0;<a href="#nt-quantifier">quantifier</a>?</code></td></tr></tbody></table></td></tr></tbody></table><p/><table border="1"><col span="1" width="50%"/><col span="1" width="50%"/><thead><tr><th>
For all <a class="termref" href="#dt-atom"><span class="arrow">&#xb7;</span>atom<span class="arrow">&#xb7;</span></a>s <em>S</em> and non-negative
integers <em>n</em>, <em>m</em> such that
<em>n &lt;= m</em>, valid <a class="termref" href="#dt-piece"><span class="arrow">&#xb7;</span>piece<span class="arrow">&#xb7;</span></a>s
<em>R</em> are:
</th><th>
Denoting the set of strings <em>L(R)</em> containing:
</th></tr></thead><tbody><tr><td align="center"><em>S</em></td><td align="center">all strings in <em>L(S)</em></td></tr><tr><td align="center"><em>S</em>?</td><td align="center">the empty string, and all strings in
  <em>L(S)</em>.</td></tr><tr><td align="center"><em>S</em>*</td><td align="center">
  All strings in <em>L(S?)</em> and all strings <em>st</em>
  with <em>s</em> in <em>L(S*)</em>
  and <em>t</em> in <em>L(S)</em>. <em>( all concatenations
  of zero or more strings from L(S) )</em>
  </td></tr><tr><td align="center"><em>S</em>+</td><td align="center">
  All strings <em>st</em> with <em>s</em> in <em>L(S)</em>
  and <em>t</em> in <em>L(S*)</em>.  <em>( all concatenations
  of one or more strings from L(S) )</em>
  </td></tr><tr><td align="center"><em>S</em>{n,m}</td><td align="center">
  All strings <em>st</em> with <em>s</em> in <em>L(S)</em>
  and <em>t</em> in <em>L(S{n-1,m-1})</em>.  <em>( All
sequences of at least n, and at most m, strings from L(S) )</em>
  </td></tr><tr><td align="center"><em>S</em>{n}</td><td align="center">
  All strings in <em>L(S{n,n})</em>.  <em>( All
sequences of exactly n strings from L(S) )</em>
  </td></tr><tr><td align="center"><em>S</em>{n,}</td><td align="center">
  All strings in L(S{n}S*)  <em>( All
sequences of at least n, strings from L(S) )</em>
  </td></tr><tr><td align="center"><em>S</em>{0,m}</td><td align="center">
  All strings <em>st</em> with <em>s</em> in <em>L(S?)</em>
  and <em>t</em> in <em>L(S{0,m-1})</em>.  <em>( All
sequences of at most m, strings from L(S) )</em>
  </td></tr><tr><td align="center"><em>S</em>{0,0}</td><td align="center">
  The set containing only the empty string
  </td></tr></tbody></table><div class="note"><b>Note:&#xa0;</b>
The regular expression language in the Perl Programming Language
<a href="#Perl">[Perl]</a> does not include a quantifier of the form
<code>S{,m}</code>, since it is logically equivalent to <code>S{0,m}</code>.
We have, therefore, left this logical possibility out of the regular
expression language defined by this specification.

</div><p>
<span class="termdef"><a id="dt-quantifier" name="dt-quantifier">[Definition:]&#xa0;&#xa0;</a>
A <b>quantifier</b>
is one of <code>?</code>, <code>*</code>, <code>+</code>,
<code>{n,m}</code> or <code>{n,}</code>, which have the meanings
defined in the table above.
</span>
</p><table width="100%" border="1" cellpadding="5" class="scrap"><tbody><tr align="left"><td><strong><font color="red">Quanitifer</font></strong></td></tr><tr><td><table border="0"><tbody><tr valign="baseline"><td><a id="quant" name="quant"/><a id="nt-quantifier" name="nt-quantifier"/>[4]&#xa0;&#xa0;&#xa0;</td><td><code>quantifier</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>[?*+] | ( '{' <a href="#nt-quantity">quantity</a> '}' )</code></td></tr></tbody><tbody><tr valign="baseline"><td><a id="quantity" name="quantity"/><a id="nt-quantity" name="nt-quantity"/>[5]&#xa0;&#xa0;&#xa0;</td><td><code>quantity</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code><a href="#nt-quantRange">quantRange</a> |
			<a href="#nt-quantMin">quantMin</a> | <a href="#nt-QuantExact">QuantExact</a></code></td></tr></tbody><tbody><tr valign="baseline"><td><a id="quantRange" name="quantRange"/><a id="nt-quantRange" name="nt-quantRange"/>[6]&#xa0;&#xa0;&#xa0;</td><td><code>quantRange</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code><a href="#nt-QuantExact">QuantExact</a> ',' <a href="#nt-QuantExact">QuantExact</a></code></td></tr></tbody><tbody><tr valign="baseline"><td><a id="quantMin" name="quantMin"/><a id="nt-quantMin" name="nt-quantMin"/>[7]&#xa0;&#xa0;&#xa0;</td><td><code>quantMin</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code><a href="#nt-QuantExact">QuantExact</a> ','</code></td></tr></tbody><tbody><tr valign="baseline"><td><a id="quantExact" name="quantExact"/><a id="nt-QuantExact" name="nt-QuantExact"/>[8]&#xa0;&#xa0;&#xa0;</td><td><code>QuantExact</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>[0-9]+</code></td></tr></tbody></table></td></tr></tbody></table><p>
<span class="termdef"><a id="dt-atom" name="dt-atom">[Definition:]&#xa0;&#xa0;</a>
An <b>atom</b> is either a
<a class="termref" href="#dt-normalc"><span class="arrow">&#xb7;</span>normal character<span class="arrow">&#xb7;</span></a>, a <a class="termref" href="#dt-charclass"><span class="arrow">&#xb7;</span>character class<span class="arrow">&#xb7;</span></a>, or
a parenthesized <a class="termref" href="#dt-regex"><span class="arrow">&#xb7;</span>regular expression<span class="arrow">&#xb7;</span></a>.</span>
</p><table width="100%" border="1" cellpadding="5" class="scrap"><tbody><tr align="left"><td><strong><font color="red">Atom</font></strong></td></tr><tr><td><table border="0"><tbody><tr valign="baseline"><td><a id="atom" name="atom"/><a id="nt-atom" name="nt-atom"/>[9]&#xa0;&#xa0;&#xa0;</td><td><code>atom</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code><a href="#nt-Char">Char</a> |
			<a href="#nt-charClass">charClass</a> | ( '('
			<a href="#nt-regExp">regExp</a> ')' )</code></td></tr></tbody></table></td></tr></tbody></table><p/><table border="1"><col span="1" width="50%"/><col span="1" width="50%"/><thead><tr><th>
For all <a class="termref" href="#dt-normalc"><span class="arrow">&#xb7;</span>normal character<span class="arrow">&#xb7;</span></a>s <em>c</em>,
<a class="termref" href="#dt-charclass"><span class="arrow">&#xb7;</span>character class<span class="arrow">&#xb7;</span></a>es <em>C</em>, and
<a class="termref" href="#dt-regex"><span class="arrow">&#xb7;</span>regular expression<span class="arrow">&#xb7;</span></a>s <em>S</em>, valid
<a class="termref" href="#dt-atom"><span class="arrow">&#xb7;</span>atom<span class="arrow">&#xb7;</span></a>s <em>R</em> are:
</th><th>
Denoting the set of strings <em>L(R)</em> containing:
</th></tr></thead><tbody><tr><td align="center"><em>c</em></td><td align="center">the single string consisting only of <em>c</em></td></tr><tr><td align="center"><em>C</em></td><td align="center">all strings in <em>L(C)</em></td></tr><tr><td align="center">(<em>S</em>)</td><td align="center">all strings in <em>L(S)</em></td></tr></tbody></table><p>
<span class="termdef"><a id="dt-metac" name="dt-metac">[Definition:]&#xa0;&#xa0;</a>
A <b>metacharacter</b>
is either <code>.</code>, <code>\</code>, <code>?</code>,
<code>*</code>, <code>+</code>, <code>{</code>, <code>}</code>
<code>(</code>, <code>)</code>, <code>[</code> or <code>]</code>.
These characters have special meanings in <a class="termref" href="#dt-regex"><span class="arrow">&#xb7;</span>regular expression<span class="arrow">&#xb7;</span></a>s,
but can be escaped to form <a class="termref" href="#dt-atom"><span class="arrow">&#xb7;</span>atom<span class="arrow">&#xb7;</span></a>s that denote the
sets of strings containing only themselves, i.e., an escaped
<a class="termref" href="#dt-metac"><span class="arrow">&#xb7;</span>metacharacter<span class="arrow">&#xb7;</span></a> behaves like a <a class="termref" href="#dt-normalc"><span class="arrow">&#xb7;</span>normal character<span class="arrow">&#xb7;</span></a>.
</span>
</p><p>
<span class="termdef"><a id="dt-normalc" name="dt-normalc">[Definition:]&#xa0;&#xa0;</a>
A
<b>normal character</b> is any XML character that is not a
metacharacter.  In <a class="termref" href="#dt-regex"><span class="arrow">&#xb7;</span>regular expression<span class="arrow">&#xb7;</span></a>s, a normal character is an
atom that denotes the singleton set of strings containing only itself.
</span>
</p><table width="100%" border="1" cellpadding="5" class="scrap"><tbody><tr align="left"><td><strong><font color="red">Normal Character</font></strong></td></tr><tr><td><table border="0"><tbody><tr valign="baseline"><td><a id="char" name="char"/><a id="nt-Char" name="nt-Char"/>[10]&#xa0;&#xa0;&#xa0;</td><td><code>Char</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>[^.\?*+()|#x5B#x5D]</code></td></tr></tbody></table></td></tr></tbody></table><p>
Note that a <a class="termref" href="#dt-normalc"><span class="arrow">&#xb7;</span>normal character<span class="arrow">&#xb7;</span></a> can be represented either as
itself, or with a <a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#dt-charref">character
reference</a>.
</p><div class="div2">
<h3 class="withToc"><span class="nav"> </span><a id="charcter-classes" name="charcter-classes"/>F.1 Character Classes</h3><p>
<span class="termdef"><a id="dt-charclass" name="dt-charclass">[Definition:]&#xa0;&#xa0;</a>
A
<b>character class</b> is an <a class="termref" href="#dt-atom"><span class="arrow">&#xb7;</span>atom<span class="arrow">&#xb7;</span></a>
&#xa0;<em>R</em> that identifies a <b>set of characters</b>
&#xa0;<em>C(R)</em>.  The set of strings <em>L(R)</em> denoted by a
character class <em>R</em> contains one single-character string
&quot;<em>c</em>&quot; for each character <em>c</em> in <em>C(R)</em>.
</span>
</p><table width="100%" border="1" cellpadding="5" class="scrap"><tbody><tr align="left"><td><strong><font color="red">Character Class</font></strong></td></tr><tr><td><table border="0"><tbody><tr valign="baseline"><td><a id="charClass" name="charClass"/><a id="nt-charClass" name="nt-charClass"/>[11]&#xa0;&#xa0;&#xa0;</td><td><code>charClass</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>
			<a href="#nt-charClassEsc">charClassEsc</a> |
			<a href="#nt-charClassExpr">charClassExpr</a> |
			<a href="#nt-WildcardEsc">WildcardEsc</a>
		</code></td></tr></tbody></table></td></tr></tbody></table><p>
A character class is either a <a class="termref" href="#dt-cces"><span class="arrow">&#xb7;</span>character class escape<span class="arrow">&#xb7;</span></a> or a
<a class="termref" href="#dt-charexpr"><span class="arrow">&#xb7;</span>character class expression<span class="arrow">&#xb7;</span></a>.
</p><p>
<span class="termdef"><a id="dt-charexpr" name="dt-charexpr">[Definition:]&#xa0;&#xa0;</a>
A
<b>character class expression</b> is a <a class="termref" href="#dt-chargroup"><span class="arrow">&#xb7;</span>character group<span class="arrow">&#xb7;</span></a> surrounded
by <code>[</code> and <code>]</code> characters.  For all character
groups <em>G</em>, [<em>G</em>] is a valid <b>character class
expression</b>, identifying the set of characters
<em>C</em>([<em>G</em>]) = <em>C</em>(<em>G</em>).
</span>
</p><table width="100%" border="1" cellpadding="5" class="scrap"><tbody><tr align="left"><td><strong><font color="red">Character Class Expression</font></strong></td></tr><tr><td><table border="0"><tbody><tr valign="baseline"><td><a id="charClassExpr" name="charClassExpr"/><a id="nt-charClassExpr" name="nt-charClassExpr"/>[12]&#xa0;&#xa0;&#xa0;</td><td><code>charClassExpr</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>'[' <a href="#nt-charGroup">charGroup</a> ']'</code></td></tr></tbody></table></td></tr></tbody></table><p>
<span class="termdef"><a id="dt-chargroup" name="dt-chargroup">[Definition:]&#xa0;&#xa0;</a>
A
<b>character group</b> is either a <a class="termref" href="#dt-poschargroup"><span class="arrow">&#xb7;</span>positive character group<span class="arrow">&#xb7;</span></a>,
a <a class="termref" href="#dt-negchargroup"><span class="arrow">&#xb7;</span>negative character group<span class="arrow">&#xb7;</span></a>, or a <a class="termref" href="#dt-subchargroup"><span class="arrow">&#xb7;</span>character class subtraction<span class="arrow">&#xb7;</span></a>.
</span>
</p><table width="100%" border="1" cellpadding="5" class="scrap"><tbody><tr align="left"><td><strong><font color="red">Character Group</font></strong></td></tr><tr><td><table border="0"><tbody><tr valign="baseline"><td><a id="chargroup" name="chargroup"/><a id="nt-charGroup" name="nt-charGroup"/>[13]&#xa0;&#xa0;&#xa0;</td><td><code>charGroup</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>
			<a href="#nt-posCharGroup">posCharGroup</a> |
			<a href="#nt-negCharGroup">negCharGroup</a> |
			<a href="#nt-charClassSub">charClassSub</a>
		</code></td></tr></tbody></table></td></tr></tbody></table><p>
<span class="termdef"><a id="dt-poschargroup" name="dt-poschargroup">[Definition:]&#xa0;&#xa0;</a>
A <b>positive character group</b> consists of one or more
<a class="termref" href="#dt-charrange"><span class="arrow">&#xb7;</span>character range<span class="arrow">&#xb7;</span></a>s or <a class="termref" href="#dt-cces"><span class="arrow">&#xb7;</span>character class escape<span class="arrow">&#xb7;</span></a>s, concatenated
together.  A <b>positive character group</b> identifies the set of
characters containing all of the characters in all of the sets identified
by its constituent ranges or escapes.
</span>
</p><table width="100%" border="1" cellpadding="5" class="scrap"><tbody><tr align="left"><td><strong><font color="red">Positive Character Group</font></strong></td></tr><tr><td><table border="0"><tbody><tr valign="baseline"><td><a id="poschargroup" name="poschargroup"/><a id="nt-posCharGroup" name="nt-posCharGroup"/>[14]&#xa0;&#xa0;&#xa0;</td><td><code>posCharGroup</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>
			(
			<a href="#nt-charRange">charRange</a> | <a href="#nt-charClassEsc">charClassEsc</a>
			)+
		</code></td></tr></tbody></table></td></tr></tbody></table><p/><table border="1"><col span="1" width="50%"/><col span="1" width="50%"/><thead><tr><th>
For all <a class="termref" href="#dt-charrange"><span class="arrow">&#xb7;</span>character range<span class="arrow">&#xb7;</span></a>s <em>R</em>, all
<a class="termref" href="#dt-cces"><span class="arrow">&#xb7;</span>character class escape<span class="arrow">&#xb7;</span></a>s <em>E</em>, and all
<a class="termref" href="#dt-poschargroup"><span class="arrow">&#xb7;</span>positive character group<span class="arrow">&#xb7;</span></a>s <em>P</em>, valid
<a class="termref" href="#dt-poschargroup"><span class="arrow">&#xb7;</span>positive character group<span class="arrow">&#xb7;</span></a>s <em>G</em> are:
</th><th>
Identifying the set of characters <em>C(G)</em> containing:
</th></tr></thead><tbody><tr><td align="center"><em>R</em></td><td align="center">all characters in <em>C(R)</em>.</td></tr><tr><td align="center"><em>E</em></td><td align="center">all characters in <em>C(E)</em>.</td></tr><tr><td align="center"><em>RP</em></td><td align="center">all characters in <em>C(R)</em> and all
  characters in <em>C(P)</em>.</td></tr><tr><td align="center"><em>EP</em></td><td align="center">all characters in <em>C(E)</em> and all
  characters in <em>C(P)</em>.</td></tr></tbody></table><p>
<span class="termdef"><a id="dt-negchargroup" name="dt-negchargroup">[Definition:]&#xa0;&#xa0;</a>
A <b>negative character group</b> is a
<a class="termref" href="#dt-poschargroup"><span class="arrow">&#xb7;</span>positive character group<span class="arrow">&#xb7;</span></a> preceded by the <code>^</code> character.
For all <a class="termref" href="#dt-poschargroup"><span class="arrow">&#xb7;</span>positive character group<span class="arrow">&#xb7;</span></a>s <em>P</em>, ^<em>P</em>
is a valid <b>negative character group</b>, and <em>C(^P)</em>
contains all XML characters that are <em>not</em> in <em>C(P)</em>.
</span>
</p><table width="100%" border="1" cellpadding="5" class="scrap"><tbody><tr align="left"><td><strong><font color="red">Negative Character Group</font></strong></td></tr><tr><td><table border="0"><tbody><tr valign="baseline"><td><a id="negchargroup" name="negchargroup"/><a id="nt-negCharGroup" name="nt-negCharGroup"/>[15]&#xa0;&#xa0;&#xa0;</td><td><code>negCharGroup</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>'^' <a href="#nt-posCharGroup">posCharGroup</a></code></td></tr></tbody></table></td></tr></tbody></table><p>
<span class="termdef"><a id="dt-subchargroup" name="dt-subchargroup">[Definition:]&#xa0;&#xa0;</a>
A
<b>character class subtraction</b> is a <a class="termref" href="#dt-charexpr"><span class="arrow">&#xb7;</span>character class expression<span class="arrow">&#xb7;</span></a>
subtracted from a <a class="termref" href="#dt-poschargroup"><span class="arrow">&#xb7;</span>positive character group<span class="arrow">&#xb7;</span></a> or
<a class="termref" href="#dt-negchargroup"><span class="arrow">&#xb7;</span>negative character group<span class="arrow">&#xb7;</span></a>, using the <code>-</code> character.
</span>
</p><table width="100%" border="1" cellpadding="5" class="scrap"><tbody><tr align="left"><td><strong><font color="red">Character Class Subtraction</font></strong></td></tr><tr><td><table border="0"><tbody><tr valign="baseline"><td><a id="charclasssub" name="charclasssub"/><a id="nt-charClassSub" name="nt-charClassSub"/>[16]&#xa0;&#xa0;&#xa0;</td><td><code>charClassSub</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>
			( <a href="#nt-posCharGroup">posCharGroup</a> |
				<a href="#nt-negCharGroup">negCharGroup</a> ) '-'
			<a href="#nt-charClassExpr">charClassExpr</a>
		</code></td></tr></tbody></table></td></tr></tbody></table><p>
For any <a class="termref" href="#dt-poschargroup"><span class="arrow">&#xb7;</span>positive character group<span class="arrow">&#xb7;</span></a> or
<a class="termref" href="#dt-negchargroup"><span class="arrow">&#xb7;</span>negative character group<span class="arrow">&#xb7;</span></a>&#xa0;<em>G</em>, and any
<a class="termref" href="#dt-charexpr"><span class="arrow">&#xb7;</span>character class expression<span class="arrow">&#xb7;</span></a>&#xa0;<em>C</em>, <em>G-C</em> is a valid
<a class="termref" href="#dt-subchargroup"><span class="arrow">&#xb7;</span>character class subtraction<span class="arrow">&#xb7;</span></a>, identifying the set of all characters in
<em>C(G)</em> that are not also in <em>C(C)</em>.
</p><p>
<span class="termdef"><a id="dt-charrange" name="dt-charrange">[Definition:]&#xa0;&#xa0;</a>
A
<b>character range</b>&#xa0;<em>R</em> identifies a set of
characters <em>C(R)</em> containing all XML characters with UCS
code points in a specified range.
</span>
</p><table width="100%" border="1" cellpadding="5" class="scrap"><tbody><tr align="left"><td><strong><font color="red">Character Range</font></strong></td></tr><tr><td><table border="0"><tbody><tr valign="baseline"><td><a id="charrange" name="charrange"/><a id="nt-charRange" name="nt-charRange"/>[17]&#xa0;&#xa0;&#xa0;</td><td><code>charRange</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>

			<a href="#nt-seRange">seRange</a> |



			
			<a href="#nt-XmlCharIncDash">XmlCharIncDash</a>
		</code></td></tr></tbody><tbody><tr valign="baseline"><td><a id="serange" name="serange"/><a id="nt-seRange" name="nt-seRange"/>[18]&#xa0;&#xa0;&#xa0;</td><td><code>seRange</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code><a href="#nt-charOrEsc">charOrEsc</a> '-' <a href="#nt-charOrEsc">charOrEsc</a></code></td></tr></tbody><tbody><tr valign="baseline"><td><a id="charoresc" name="charoresc"/><a id="nt-charOrEsc" name="nt-charOrEsc"/>[20]&#xa0;&#xa0;&#xa0;</td><td><code>charOrEsc</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code><a href="#nt-XmlChar">XmlChar</a> | <a href="#nt-SingleCharEsc">SingleCharEsc</a></code></td></tr></tbody><tbody><tr valign="baseline"><td><a id="xmlchar" name="xmlchar"/><a id="nt-XmlChar" name="nt-XmlChar"/>[21]&#xa0;&#xa0;&#xa0;</td><td><code>XmlChar</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>[^\#x2D#x5B#x5D]</code></td></tr></tbody><tbody><tr valign="baseline"><td><a id="XmlCharIncDash" name="XmlCharIncDash"/><a id="nt-XmlCharIncDash" name="nt-XmlCharIncDash"/>[22]&#xa0;&#xa0;&#xa0;</td><td><code>XmlCharIncDash</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>[^\#x5B#x5D]</code></td></tr></tbody></table></td></tr></tbody></table><p>
A single XML character is a <a class="termref" href="#dt-charrange"><span class="arrow">&#xb7;</span>character range<span class="arrow">&#xb7;</span></a> that identifies
the set of characters containing only itself.  All XML characters are valid
character ranges, except as follows:
</p><ul><li>
The <code>[</code>, <code>]</code>, <code>-</code> and <code>\</code> characters are not
valid character ranges;
</li><li>
The <code>^</code> character is only valid at the beginning of a
<a class="termref" href="#dt-poschargroup"><span class="arrow">&#xb7;</span>positive character group<span class="arrow">&#xb7;</span></a> if it is part of a
<a class="termref" href="#dt-negchargroup"><span class="arrow">&#xb7;</span>negative character group<span class="arrow">&#xb7;</span></a>
</li><li>

The <code>-</code> character is a valid character range only at the beginning
or end of a <a class="termref" href="#dt-poschargroup"><span class="arrow">&#xb7;</span>positive character group<span class="arrow">&#xb7;</span></a>.

</li></ul><div class="note"><b>Note:&#xa0;</b>The grammar for <a class="termref" href="#dt-charrange"><span class="arrow">&#xb7;</span>character range<span class="arrow">&#xb7;</span></a> as
given above is ambiguous, but the second and third bullets above
together remove the ambiguity.</div><p>
A <a class="termref" href="#dt-charrange"><span class="arrow">&#xb7;</span>character range<span class="arrow">&#xb7;</span></a>&#xa0;<a class="termref" href="#dt-may"><span class="arrow">&#xb7;</span>may<span class="arrow">&#xb7;</span></a> also be written
in the form <em>s-e</em>, identifying the set that contains all XML characters
with UCS code points greater than or equal to the code point
of <em>s</em>, but not greater than the code point of <em>e</em>.
</p><p>
<em>s-e</em> is a valid character range iff:
</p><ul><li>
<em>s</em> is a <a class="termref" href="#dt-cces1"><span class="arrow">&#xb7;</span>single character escape<span class="arrow">&#xb7;</span></a>, or an XML character;
</li><li>
<em>s</em> is not <code>\</code>
</li><li>
If s is the first character in a <a class="termref" href="#dt-charexpr"><span class="arrow">&#xb7;</span>character class expression<span class="arrow">&#xb7;</span></a>, then
<em>s</em> is not <code>^</code>
</li><li>
<em>e</em> is a <a class="termref" href="#dt-cces1"><span class="arrow">&#xb7;</span>single character escape<span class="arrow">&#xb7;</span></a>, or an XML character;
</li><li>
<em>e</em> is not <code>\</code> or <code>[</code>; and
</li><li>
The code point of <em>e</em> is greater than or equal to the code
point of <em>s</em>;
</li></ul><div class="note"><b>Note:&#xa0;</b>
The code point of a <a class="termref" href="#dt-cces1"><span class="arrow">&#xb7;</span>single character escape<span class="arrow">&#xb7;</span></a> is the code point of the
single character in the set of characters that it identifies.
</div><div class="div3">
<h4><a id="cces" name="cces"/>F.1.1 Character Class Escapes</h4><p>
<span class="termdef"><a id="dt-cces" name="dt-cces">[Definition:]&#xa0;&#xa0;</a>
A <b>character class escape</b> is a short sequence of characters
that identifies predefined character class.  The valid character
class escapes are the <a class="termref" href="#dt-cces1"><span class="arrow">&#xb7;</span>single character escape<span class="arrow">&#xb7;</span></a>s, the
<a class="termref" href="#dt-ccesN"><span class="arrow">&#xb7;</span>multi-character escape<span class="arrow">&#xb7;</span></a>s, and the <a class="termref" href="#dt-ccescat"><span class="arrow">&#xb7;</span>category escape<span class="arrow">&#xb7;</span></a>s (including
the <a class="termref" href="#dt-ccesblock"><span class="arrow">&#xb7;</span>block escape<span class="arrow">&#xb7;</span></a>s).
</span>
</p><table width="100%" border="1" cellpadding="5" class="scrap"><tbody><tr align="left"><td><strong><font color="red">Character Class Escape</font></strong></td></tr><tr><td><table border="0"><tbody><tr valign="baseline"><td><a id="charclassesc" name="charclassesc"/><a id="nt-charClassEsc" name="nt-charClassEsc"/>[23]&#xa0;&#xa0;&#xa0;</td><td><code>charClassEsc</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>
			(
			<a href="#nt-SingleCharEsc">SingleCharEsc</a> |
			<a href="#nt-MultiCharEsc">MultiCharEsc</a> |
			<a href="#nt-catEsc">catEsc</a> |
			<a href="#nt-complEsc">complEsc</a>
			)
		</code></td></tr></tbody></table></td></tr></tbody></table><p>
<span class="termdef"><a id="dt-cces1" name="dt-cces1">[Definition:]&#xa0;&#xa0;</a>
A
<b>single character escape</b> identifies a set containing a only
one character -- usually because that character is difficult or
impossible to write directly into a <a class="termref" href="#dt-regex"><span class="arrow">&#xb7;</span>regular expression<span class="arrow">&#xb7;</span></a>.
</span>
</p><table width="100%" border="1" cellpadding="5" class="scrap"><tbody><tr align="left"><td><strong><font color="red">Single Character Escape</font></strong></td></tr><tr><td><table border="0"><tbody><tr valign="baseline"><td><a id="singlecharesc" name="singlecharesc"/><a id="nt-SingleCharEsc" name="nt-SingleCharEsc"/>[24]&#xa0;&#xa0;&#xa0;</td><td><code>SingleCharEsc</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>'\' [nrt\|.?*+(){}#x2D#x5B#x5D#x5E]</code></td></tr></tbody></table></td></tr></tbody></table><p/><table border="1"><col span="1" width="50%"/><col span="1" width="50%"/><thead><tr><th>
The valid <a class="termref" href="#dt-cces1"><span class="arrow">&#xb7;</span>single character escape<span class="arrow">&#xb7;</span></a>s are:
</th><th>
Identifying the set of characters <em>C(R)</em> containing:
</th></tr></thead><tbody><tr><td align="center"><code>\n</code></td><td align="center">the newline character (#xA)</td></tr><tr><td align="center"><code>\r</code></td><td align="center">the return character (#xD)</td></tr><tr><td align="center"><code>\t</code></td><td align="center">the tab character (#x9)</td></tr><tr><td align="center"><code>\\</code></td><td align="center">\</td></tr><tr><td align="center"><code>\|</code></td><td align="center">|</td></tr><tr><td align="center"><code>\.</code></td><td align="center">.</td></tr><tr><td align="center"><code>\-</code></td><td align="center">-</td></tr><tr><td align="center"><code>\^</code></td><td align="center">^</td></tr><tr><td align="center"><code>\?</code></td><td align="center">?</td></tr><tr><td align="center"><code>\*</code></td><td align="center">*</td></tr><tr><td align="center"><code>\+</code></td><td align="center">+</td></tr><tr><td align="center"><code>\{</code></td><td align="center">{</td></tr><tr><td align="center"><code>\}</code></td><td align="center">}</td></tr><tr><td align="center"><code>\(</code></td><td align="center">(</td></tr><tr><td align="center"><code>\)</code></td><td align="center">)</td></tr><tr><td align="center"><code>\[</code></td><td align="center">[</td></tr><tr><td align="center"><code>\]</code></td><td align="center">]</td></tr></tbody></table><p>
<span class="termdef"><a id="dt-ccescat" name="dt-ccescat">[Definition:]&#xa0;&#xa0;</a>
<a href="#UnicodeDB">[Unicode Database]</a> specifies a number of possible
values for the &quot;General Category&quot; property
and provides mappings from code points to specific character properties.
The set containing all characters that have property <code>X</code>,
can be identified with a <b>category escape</b> <code>\p{X}</code>.
The complement of this set is specified with the
<b>category escape</b> <code>\P{X}</code>.
(<code>[\P{X}]</code> = <code>[^\p{X}]</code>).
</span>
</p><table width="100%" border="1" cellpadding="5" class="scrap"><tbody><tr align="left"><td><strong><font color="red">Category Escape</font></strong></td></tr><tr><td><table border="0"><tbody><tr valign="baseline"><td><a id="catesc" name="catesc"/><a id="nt-catEsc" name="nt-catEsc"/>[25]&#xa0;&#xa0;&#xa0;</td><td><code>catEsc</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>'\p{' <a href="#nt-charProp">charProp</a> '}'</code></td></tr></tbody><tbody><tr valign="baseline"><td><a id="complesc" name="complesc"/><a id="nt-complEsc" name="nt-complEsc"/>[26]&#xa0;&#xa0;&#xa0;</td><td><code>complEsc</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>'\P{' <a href="#nt-charProp">charProp</a> '}'</code></td></tr></tbody><tbody><tr valign="baseline"><td><a id="charprop" name="charprop"/><a id="nt-charProp" name="nt-charProp"/>[27]&#xa0;&#xa0;&#xa0;</td><td><code>charProp</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code><a href="#nt-IsCategory">IsCategory</a> | <a href="#nt-IsBlock">IsBlock</a></code></td></tr></tbody></table></td></tr></tbody></table><div class="note"><b>Note:&#xa0;</b>
<a href="#UnicodeDB">[Unicode Database]</a> is subject to future revision.  For example, the
mapping from code points to character properties might be updated.
All <a class="termref" href="#dt-minimally-conforming"><span class="arrow">&#xb7;</span>minimally conforming<span class="arrow">&#xb7;</span></a> processors <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a>
support the character properties defined in the version of <a href="#UnicodeDB">[Unicode Database]</a>
that is current at the time this specification became a W3C
Recommendation.  However, implementors are encouraged to support the
character properties defined in any future version.
</div><p>
The following table specifies the recognized values of the
&quot;General Category&quot; property.
</p><table align="center" border="1"><tbody><tr><th>Category</th><th>Property</th><th>Meaning</th></tr><tr><td rowspan="6">Letters</td><td align="center">L</td><td>All Letters</td></tr><tr><td align="center">Lu</td><td>uppercase</td></tr><tr><td align="center">Ll</td><td>lowercase</td></tr><tr><td align="center">Lt</td><td>titlecase</td></tr><tr><td align="center">Lm</td><td>modifier</td></tr><tr><td align="center">Lo</td><td>other</td></tr><tr><td colspan="3">&#xa0;</td></tr><tr><td rowspan="4">Marks</td><td align="center">M</td><td>All Marks</td></tr><tr><td align="center">Mn</td><td>nonspacing</td></tr><tr><td align="center">Mc</td><td>spacing combining</td></tr><tr><td align="center">Me</td><td>enclosing</td></tr><tr><td colspan="3">&#xa0;</td></tr><tr><td rowspan="4">Numbers</td><td align="center">N</td><td>All Numbers</td></tr><tr><td align="center">Nd</td><td>decimal digit</td></tr><tr><td align="center">Nl</td><td>letter</td></tr><tr><td align="center">No</td><td>other</td></tr><tr><td colspan="3">&#xa0;</td></tr><tr><td rowspan="8">Punctuation</td><td align="center">P</td><td>All Punctuation</td></tr><tr><td align="center">Pc</td><td>connector</td></tr><tr><td align="center">Pd</td><td>dash</td></tr><tr><td align="center">Ps</td><td>open</td></tr><tr><td align="center">Pe</td><td>close</td></tr><tr><td align="center">Pi</td><td>initial quote
			(may behave like Ps or Pe depending on usage)</td></tr><tr><td align="center">Pf</td><td>final quote
			(may behave like Ps or Pe depending on usage)</td></tr><tr><td align="center">Po</td><td>other</td></tr><tr><td colspan="3">&#xa0;</td></tr><tr><td rowspan="4">Separators</td><td align="center">Z</td><td>All Separators</td></tr><tr><td align="center">Zs</td><td>space</td></tr><tr><td align="center">Zl</td><td>line</td></tr><tr><td align="center">Zp</td><td>paragraph</td></tr><tr><td colspan="3">&#xa0;</td></tr><tr><td rowspan="5">Symbols</td><td align="center">S</td><td>All Symbols</td></tr><tr><td align="center">Sm</td><td>math</td></tr><tr><td align="center">Sc</td><td>currency</td></tr><tr><td align="center">Sk</td><td>modifier</td></tr><tr><td align="center">So</td><td>other</td></tr><tr><td colspan="3">&#xa0;</td></tr><tr><td rowspan="6">Other</td><td align="center">C</td><td>All Others</td></tr><tr><td align="center">Cc</td><td>control</td></tr><tr><td align="center">Cf</td><td>format</td></tr><tr><td align="center">Co</td><td>private use</td></tr><tr><td align="center">Cn</td><td>not assigned</td></tr></tbody></table><table width="100%" border="1" cellpadding="5" class="scrap"><tbody><tr align="left"><td><strong><font color="red">Categories</font></strong></td></tr><tr><td><table border="0"><tbody><tr valign="baseline"><td><a id="cats" name="cats"/><a id="nt-IsCategory" name="nt-IsCategory"/>[28]&#xa0;&#xa0;&#xa0;</td><td><code>IsCategory</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>
			<a href="#nt-Letters">Letters</a> |
			<a href="#nt-Marks">Marks</a> |
			<a href="#nt-Numbers">Numbers</a> |
			<a href="#nt-Punctuation">Punctuation</a> |
			<a href="#nt-Separators">Separators</a> |
			<a href="#nt-Symbols">Symbols</a> |
			<a href="#nt-Others">Others</a>
		</code></td></tr></tbody><tbody><tr valign="baseline"><td><a id="lets" name="lets"/><a id="nt-Letters" name="nt-Letters"/>[29]&#xa0;&#xa0;&#xa0;</td><td><code>Letters</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>'L' [ultmo]?</code></td></tr></tbody><tbody><tr valign="baseline"><td><a id="marks" name="marks"/><a id="nt-Marks" name="nt-Marks"/>[30]&#xa0;&#xa0;&#xa0;</td><td><code>Marks</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>'M' [nce]?</code></td></tr></tbody><tbody><tr valign="baseline"><td><a id="nums" name="nums"/><a id="nt-Numbers" name="nt-Numbers"/>[31]&#xa0;&#xa0;&#xa0;</td><td><code>Numbers</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>'N' [dlo]?</code></td></tr></tbody><tbody><tr valign="baseline"><td><a id="punc" name="punc"/><a id="nt-Punctuation" name="nt-Punctuation"/>[32]&#xa0;&#xa0;&#xa0;</td><td><code>Punctuation</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>'P' [cdseifo]?</code></td></tr></tbody><tbody><tr valign="baseline"><td><a id="seps" name="seps"/><a id="nt-Separators" name="nt-Separators"/>[33]&#xa0;&#xa0;&#xa0;</td><td><code>Separators</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>'Z' [slp]?</code></td></tr></tbody><tbody><tr valign="baseline"><td><a id="syms" name="syms"/><a id="nt-Symbols" name="nt-Symbols"/>[34]&#xa0;&#xa0;&#xa0;</td><td><code>Symbols</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>'S' [mcko]?</code></td></tr></tbody><tbody><tr valign="baseline"><td><a id="others" name="others"/><a id="nt-Others" name="nt-Others"/>[35]&#xa0;&#xa0;&#xa0;</td><td><code>Others</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>'C' [cfon]?</code></td></tr></tbody></table></td></tr></tbody></table><div class="note"><b>Note:&#xa0;</b>
The properties mentioned above exclude the <code>Cs</code> property.
The <code>Cs</code> property identifies &quot;surrogate&quot; characters, which do not
occur at the level of the &quot;character abstraction&quot; that XML instance documents
operate on.
</div><p>
<span class="termdef"><a id="dt-ccesblock" name="dt-ccesblock">[Definition:]&#xa0;&#xa0;</a>
<a href="#UnicodeDB">[Unicode Database]</a> groups code points into a number of blocks
such as Basic Latin (i.e., ASCII), Latin-1 Supplement, Hangul Jamo,
CJK Compatibility, etc.
The set containing all characters that have block name <code>X</code>
(with all white space stripped out),
can be identified with a <b>block escape</b> <code>\p{IsX}</code>.
The complement of this set is specified with the
<b>block escape</b> <code>\P{IsX}</code>.
(<code>[\P{IsX}]</code> = <code>[^\p{IsX}]</code>).
</span>
</p><table width="100%" border="1" cellpadding="5" class="scrap"><tbody><tr align="left"><td><strong><font color="red">Block Escape</font></strong></td></tr><tr><td><table border="0"><tbody><tr valign="baseline"><td><a id="blockesc" name="blockesc"/><a id="nt-IsBlock" name="nt-IsBlock"/>[36]&#xa0;&#xa0;&#xa0;</td><td><code>IsBlock</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>'Is' [a-zA-Z0-9#x2D]+</code></td></tr></tbody></table></td></tr></tbody></table><p>
The following table specifies the recognized block names (for more
information, see the &quot;Blocks.txt&quot; file in <a href="#UnicodeDB">[Unicode Database]</a>).
</p><table cellpadding="5" align="center" border="1"><tbody><tr><th>Start Code</th><th>End Code</th><th>Block Name</th><th>&#xa0;</th><th>Start Code</th><th>End Code</th><th>Block Name</th></tr><tr><td>#x0000</td><td>#x007F</td><td>BasicLatin</td><td>&#xa0;</td><td>#x0080</td><td>#x00FF</td><td>Latin-1Supplement</td></tr><tr><td>#x0100</td><td>#x017F</td><td>LatinExtended-A</td><td>&#xa0;</td><td>#x0180</td><td>#x024F</td><td>LatinExtended-B</td></tr><tr><td>#x0250</td><td>#x02AF</td><td>IPAExtensions</td><td>&#xa0;</td><td>#x02B0</td><td>#x02FF</td><td>SpacingModifierLetters</td></tr><tr><td>#x0300</td><td>#x036F</td><td>CombiningDiacriticalMarks</td><td>&#xa0;</td><td>#x0370</td><td>#x03FF</td><td>Greek</td></tr><tr><td>#x0400</td><td>#x04FF</td><td>Cyrillic</td><td>&#xa0;</td><td>#x0530</td><td>#x058F</td><td>Armenian</td></tr><tr><td>#x0590</td><td>#x05FF</td><td>Hebrew</td><td>&#xa0;</td><td>#x0600</td><td>#x06FF</td><td>Arabic</td></tr><tr><td>#x0700</td><td>#x074F</td><td>Syriac</td><td>&#xa0;</td><td>#x0780</td><td>#x07BF</td><td>Thaana</td></tr><tr><td>#x0900</td><td>#x097F</td><td>Devanagari</td><td>&#xa0;</td><td>#x0980</td><td>#x09FF</td><td>Bengali</td></tr><tr><td>#x0A00</td><td>#x0A7F</td><td>Gurmukhi</td><td>&#xa0;</td><td>#x0A80</td><td>#x0AFF</td><td>Gujarati</td></tr><tr><td>#x0B00</td><td>#x0B7F</td><td>Oriya</td><td>&#xa0;</td><td>#x0B80</td><td>#x0BFF</td><td>Tamil</td></tr><tr><td>#x0C00</td><td>#x0C7F</td><td>Telugu</td><td>&#xa0;</td><td>#x0C80</td><td>#x0CFF</td><td>Kannada</td></tr><tr><td>#x0D00</td><td>#x0D7F</td><td>Malayalam</td><td>&#xa0;</td><td>#x0D80</td><td>#x0DFF</td><td>Sinhala</td></tr><tr><td>#x0E00</td><td>#x0E7F</td><td>Thai</td><td>&#xa0;</td><td>#x0E80</td><td>#x0EFF</td><td>Lao</td></tr><tr><td>#x0F00</td><td>#x0FFF</td><td>Tibetan</td><td>&#xa0;</td><td>#x1000</td><td>#x109F</td><td>Myanmar</td></tr><tr><td>#x10A0</td><td>#x10FF</td><td>Georgian</td><td>&#xa0;</td><td>#x1100</td><td>#x11FF</td><td>HangulJamo</td></tr><tr><td>#x1200</td><td>#x137F</td><td>Ethiopic</td><td>&#xa0;</td><td>#x13A0</td><td>#x13FF</td><td>Cherokee</td></tr><tr><td>#x1400</td><td>#x167F</td><td>UnifiedCanadianAboriginalSyllabics</td><td>&#xa0;</td><td>#x1680</td><td>#x169F</td><td>Ogham</td></tr><tr><td>#x16A0</td><td>#x16FF</td><td>Runic</td><td>&#xa0;</td><td>#x1780</td><td>#x17FF</td><td>Khmer</td></tr><tr><td>#x1800</td><td>#x18AF</td><td>Mongolian</td><td>&#xa0;</td><td>#x1E00</td><td>#x1EFF</td><td>LatinExtendedAdditional</td></tr><tr><td>#x1F00</td><td>#x1FFF</td><td>GreekExtended</td><td>&#xa0;</td><td>#x2000</td><td>#x206F</td><td>GeneralPunctuation</td></tr><tr><td>#x2070</td><td>#x209F</td><td>SuperscriptsandSubscripts</td><td>&#xa0;</td><td>#x20A0</td><td>#x20CF</td><td>CurrencySymbols</td></tr><tr><td>#x20D0</td><td>#x20FF</td><td>CombiningMarksforSymbols</td><td>&#xa0;</td><td>#x2100</td><td>#x214F</td><td>LetterlikeSymbols</td></tr><tr><td>#x2150</td><td>#x218F</td><td>NumberForms</td><td>&#xa0;</td><td>#x2190</td><td>#x21FF</td><td>Arrows</td></tr><tr><td>#x2200</td><td>#x22FF</td><td>MathematicalOperators</td><td>&#xa0;</td><td>#x2300</td><td>#x23FF</td><td>MiscellaneousTechnical</td></tr><tr><td>#x2400</td><td>#x243F</td><td>ControlPictures</td><td>&#xa0;</td><td>#x2440</td><td>#x245F</td><td>OpticalCharacterRecognition</td></tr><tr><td>#x2460</td><td>#x24FF</td><td>EnclosedAlphanumerics</td><td>&#xa0;</td><td>#x2500</td><td>#x257F</td><td>BoxDrawing</td></tr><tr><td>#x2580</td><td>#x259F</td><td>BlockElements</td><td>&#xa0;</td><td>#x25A0</td><td>#x25FF</td><td>GeometricShapes</td></tr><tr><td>#x2600</td><td>#x26FF</td><td>MiscellaneousSymbols</td><td>&#xa0;</td><td>#x2700</td><td>#x27BF</td><td>Dingbats</td></tr><tr><td>#x2800</td><td>#x28FF</td><td>BraillePatterns</td><td>&#xa0;</td><td>#x2E80</td><td>#x2EFF</td><td>CJKRadicalsSupplement</td></tr><tr><td>#x2F00</td><td>#x2FDF</td><td>KangxiRadicals</td><td>&#xa0;</td><td>#x2FF0</td><td>#x2FFF</td><td>IdeographicDescriptionCharacters</td></tr><tr><td>#x3000</td><td>#x303F</td><td>CJKSymbolsandPunctuation</td><td>&#xa0;</td><td>#x3040</td><td>#x309F</td><td>Hiragana</td></tr><tr><td>#x30A0</td><td>#x30FF</td><td>Katakana</td><td>&#xa0;</td><td>#x3100</td><td>#x312F</td><td>Bopomofo</td></tr><tr><td>#x3130</td><td>#x318F</td><td>HangulCompatibilityJamo</td><td>&#xa0;</td><td>#x3190</td><td>#x319F</td><td>Kanbun</td></tr><tr><td>#x31A0</td><td>#x31BF</td><td>BopomofoExtended</td><td>&#xa0;</td><td>#x3200</td><td>#x32FF</td><td>EnclosedCJKLettersandMonths</td></tr><tr><td>#x3300</td><td>#x33FF</td><td>CJKCompatibility</td><td>&#xa0;</td><td>#x3400</td><td>#x4DB5</td><td>CJKUnifiedIdeographsExtensionA</td></tr><tr><td>#x4E00</td><td>#x9FFF</td><td>CJKUnifiedIdeographs</td><td>&#xa0;</td><td>#xA000</td><td>#xA48F</td><td>YiSyllables</td></tr><tr><td>#xA490</td><td>#xA4CF</td><td>YiRadicals</td><td>&#xa0;</td><td>#xAC00</td><td>#xD7A3</td><td>HangulSyllables</td></tr><tr><td/><td/><td/><td>&#xa0;</td><td/><td/><td/></tr><tr><td/><td/><td/><td>&#xa0;</td><td>#xE000</td><td>#xF8FF</td><td>PrivateUse</td></tr><tr><td>#xF900</td><td>#xFAFF</td><td>CJKCompatibilityIdeographs</td><td>&#xa0;</td><td>#xFB00</td><td>#xFB4F</td><td>AlphabeticPresentationForms</td></tr><tr><td>#xFB50</td><td>#xFDFF</td><td>ArabicPresentationForms-A</td><td>&#xa0;</td><td>#xFE20</td><td>#xFE2F</td><td>CombiningHalfMarks</td></tr><tr><td>#xFE30</td><td>#xFE4F</td><td>CJKCompatibilityForms</td><td>&#xa0;</td><td>#xFE50</td><td>#xFE6F</td><td>SmallFormVariants</td></tr><tr><td>#xFE70</td><td>#xFEFE</td><td>ArabicPresentationForms-B</td><td>&#xa0;</td><td>#xFEFF</td><td>#xFEFF</td><td>Specials</td></tr><tr><td>#xFF00</td><td>#xFFEF</td><td>HalfwidthandFullwidthForms</td><td>&#xa0;</td><td>#xFFF0</td><td>#xFFFD</td><td>Specials</td></tr></tbody></table><div class="note"><b>Note:&#xa0;</b>

The blocks mentioned above exclude the <code>HighSurrogates</code>,
<code>LowSurrogates</code> and <code>HighPrivateUseSurrogates</code> blocks.
These blocks identify &quot;surrogate&quot; characters, which do not
occur at the level of the &quot;character abstraction&quot; that XML instance documents
operate on.

</div><div class="note"><b>Note:&#xa0;</b>
<a href="#UnicodeDB">[Unicode Database]</a> is subject to future revision.
For example, the
grouping of code points into blocks might be updated.
All <a class="termref" href="#dt-minimally-conforming"><span class="arrow">&#xb7;</span>minimally conforming<span class="arrow">&#xb7;</span></a> processors <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a>
support the blocks defined in the version of <a href="#UnicodeDB">[Unicode Database]</a>
that is current at the time this specification became a W3C
Recommendation.  However, implementors are encouraged to support the
blocks defined in any future version of the Unicode Standard.
</div><p>
For example, the <a class="termref" href="#dt-ccesblock"><span class="arrow">&#xb7;</span>block escape<span class="arrow">&#xb7;</span></a> for identifying the
ASCII characters is <code>\p{IsBasicLatin}</code>.
</p><p>
<span class="termdef"><a id="dt-ccesN" name="dt-ccesN">[Definition:]&#xa0;&#xa0;</a>
A
<b>multi-character escape</b> provides a simple way to identify
a commonly used set of characters:
</span>
</p><table width="100%" border="1" cellpadding="5" class="scrap"><tbody><tr align="left"><td><strong><font color="red">Multi-Character Escape</font></strong></td></tr><tr><td><table border="0"><tbody><tr valign="baseline"><td><a id="multicharesc" name="multicharesc"/><a id="nt-MultiCharEsc" name="nt-MultiCharEsc"/>[37]&#xa0;&#xa0;&#xa0;</td><td><code>MultiCharEsc</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>'\' [sSiIcCdDwW]</code></td></tr></tbody><tbody><tr valign="baseline"><td><a id="wildcardesc" name="wildcardesc"/><a id="nt-WildcardEsc" name="nt-WildcardEsc"/>[37a]&#xa0;&#xa0;&#xa0;</td><td><code>WildcardEsc</code></td><td>&#xa0;&#xa0;&#xa0;::=&#xa0;&#xa0;&#xa0;</td><td><code>'.'</code></td></tr></tbody></table></td></tr></tbody></table><p/><table cellpadding="5" align="center" border="1"><col span="1" width="33%"/><col span="1" width="33%"/><col span="1" width="33%"/><thead><tr><th>Character sequence</th><th>Equivalent <a class="termref" href="#dt-charclass"><span class="arrow">&#xb7;</span>character class<span class="arrow">&#xb7;</span></a></th></tr></thead><tbody><tr><td align="center">.</td><td align="center">[^\n\r]</td></tr><tr><td align="center">\s</td><td align="center">[#x20\t\n\r]</td></tr><tr><td align="center">\S</td><td align="center">[^\s]</td></tr><tr><td align="center">\i</td><td align="center">
		the set of initial name characters, those
		<a class="termref" href="#dt-match"><span class="arrow">&#xb7;</span>match<span class="arrow">&#xb7;</span></a>ed by
		<a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#NT-Letter">Letter</a> | '_' | ':'</td></tr><tr><td align="center">\I</td><td align="center">[^\i]</td></tr><tr><td align="center">\c</td><td align="center">

		the set of name characters, those
		<a class="termref" href="#dt-match"><span class="arrow">&#xb7;</span>match<span class="arrow">&#xb7;</span></a>ed by
		<a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#NT-NameChar">NameChar</a></td></tr><tr><td align="center">\C</td><td align="center">[^\c]</td></tr><tr><td align="center">\d</td><td align="center">\p{Nd}</td></tr><tr><td align="center">\D</td><td align="center">[^\d]</td></tr><tr><td align="center">\w</td><td align="center">
			[#x0000-#x10FFFF]-[\p{P}\p{Z}\p{C}]
			(<em>all characters except the set of &quot;punctuation&quot;,
				&quot;separator&quot; and &quot;other&quot; characters</em>)
		</td></tr><tr><td align="center">\W</td><td align="center">[^\w]</td></tr></tbody></table><div class="note"><b>Note:&#xa0;</b>
The <a class="termref" href="#dt-regex"><span class="arrow">&#xb7;</span>regular expression<span class="arrow">&#xb7;</span></a> language defined here does not
attempt to provide a general solution to &quot;regular expressions&quot; over
UCS character sequences.  In particular, it does not easily provide
for matching sequences of base characters and combining marks.
The language is targeted at support of &quot;Level 1&quot; features as defined in
<a href="#unicodeRegEx">[Unicode Regular Expression Guidelines]</a>.  It is hoped that future versions of this
specification will provide support for &quot;Level 2&quot; features.
</div></div></div></div><div class="div1">
<h2><a id="normative-glossary" name="normative-glossary"/>G Glossary (non-normative)</h2><p>The listing below is for the benefit of readers of a printed version of this
document:  it collects together all the definitions which appear in the
document above.</p><dl><dt><a href="#dt-atomic">atomic</a></dt><dd><b>Atomic</b> datatypes
are those having values which are regarded by this specification as
being indivisible.
</dd><dt><a href="#dt-basetype">base type</a></dt><dd>Every
datatype that is <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> by <b>restriction</b>
is defined in terms of an existing datatype, referred to as its
<b>base type</b>. <b>base type</b>s can be either
<a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a> or <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>.
</dd><dt><a href="#dt-bounded">bounded</a></dt><dd>A datatype is <b>bounded</b>
if its <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> has either an
<a class="termref" href="#dt-inclusive-upper-bound"><span class="arrow">&#xb7;</span>inclusive upper bound<span class="arrow">&#xb7;</span></a> or an <a class="termref" href="#dt-exclusive-upper-bound"><span class="arrow">&#xb7;</span>exclusive upper bound<span class="arrow">&#xb7;</span></a>
and either an <a class="termref" href="#dt-inclusive-lower-bound"><span class="arrow">&#xb7;</span>inclusive lower bound<span class="arrow">&#xb7;</span></a> or
 an
<a class="termref" href="#dt-exclusive-lower-bound"><span class="arrow">&#xb7;</span>exclusive lower bound<span class="arrow">&#xb7;</span></a>.
</dd><dt><a href="#dt-built-in">built-in</a></dt><dd><b>Built-in</b>
datatypes are those which are defined in this specification,
and can be either <a class="termref" href="#dt-primitive"><span class="arrow">&#xb7;</span>primitive<span class="arrow">&#xb7;</span></a> or
<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>;
</dd><dt><a href="#dt-canonical-representation">canonical lexical representation</a></dt><dd>A <b>canonical lexical representation</b>
is a set of literals from among the valid set of literals
for a datatype such that there is a one-to-one mapping between literals
in the <b>canonical lexical representation</b> and
values in the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>.
</dd><dt><a href="#dt-cardinality">cardinality</a></dt><dd>Every
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> has associated with it the concept of
<b>cardinality</b>.  Some <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>s
are finite, some are countably infinite while still others could
conceivably be uncountably infinite (although no <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
defined by this specification is uncountable infinite). A datatype is
said to have the cardinality of its
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>.
</dd><dt><a href="#dt-comparable">comparable</a></dt><dd>otherwise they are <b>comparable</b>.</dd><dt><a href="#dt-interchange">conformance to the XML Representation of Schemas</a></dt><dd>
Processors which accept schemas in the form of XML documents as described
in <a href="#xr-defn">XML Representation of Simple Type Definition Schema Components (&#xa7;4.1.2)</a> (and other relevant portions of
<a href="#datatype-components">Datatype components (&#xa7;4)</a>) are additionally said to provide
<b>conformance to the XML Representation of Schemas</b>,
and <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a>, when processing schema documents, completely and
correctly implement all
<a class="termref" href="#dt-src"><span class="arrow">&#xb7;</span>Schema Representation Constraint<span class="arrow">&#xb7;</span></a>s
in this specification, and <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a> adhere exactly to the
specifications in <a href="#xr-defn">XML Representation of Simple Type Definition Schema Components (&#xa7;4.1.2)</a>  (and other relevant portions of
<a href="#datatype-components">Datatype components (&#xa7;4)</a>) for mapping
the contents of such
documents to <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#key-component">schema components</a>
for use in validation.
</dd><dt><a href="#dt-constraining-facet">constraining facet</a></dt><dd>A
<b>constraining facet</b> is an optional property that can be
applied to a datatype to constrain its <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>.
</dd><dt><a href="#dt-cos">Constraint on Schemas</a></dt><dd>
<b>Constraint on Schemas</b>
</dd><dt><a href="#dt-datatype">datatype</a></dt><dd>In this specification,
a <b>datatype</b> is a 3-tuple, consisting of
a) a set of distinct values, called its <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>,
b) a set of lexical representations, called its
<a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a>, and c) a set of <a class="termref" href="#dt-facet"><span class="arrow">&#xb7;</span>facet<span class="arrow">&#xb7;</span></a>s
that characterize properties of the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>,
individual values or lexical items.
</dd><dt><a href="#dt-derived">derived</a></dt><dd><b>Derived</b>
datatypes are those that are defined in terms of other datatypes.
</dd><dt><a href="#dt-error">error</a></dt><dd><b>error</b></dd><dt><a href="#dt-exclusive-lower-bound">exclusive lower bound</a></dt><dd>
A value <em>l</em> in an <a class="termref" href="#dt-ordered"><span class="arrow">&#xb7;</span>ordered<span class="arrow">&#xb7;</span></a>
&#xa0;<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>&#xa0;<em>L</em>
is said to be an <b>exclusive lower bound</b> of a
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>&#xa0;<em>V</em>
(where <em>V</em> is a subset of <em>L</em>)
if for all <em>v</em> in <em>V</em>,
<em>l</em> &lt; <em>v</em>.
</dd><dt><a href="#dt-exclusive-upper-bound">exclusive upper bound</a></dt><dd>
A value <em>u</em> in an <a class="termref" href="#dt-ordered"><span class="arrow">&#xb7;</span>ordered<span class="arrow">&#xb7;</span></a>
&#xa0;<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>&#xa0;<em>U</em>
is said to be an <b>exclusive upper bound</b> of a
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>&#xa0;<em>V</em>
(where <em>V</em> is a subset of <em>U</em>)
if for all <em>v</em> in <em>V</em>,
<em>u</em> &gt; <em>v</em>.
</dd><dt><a href="#dt-facet">facet</a></dt><dd>A <b>facet</b> is a single
defining aspect of a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>.  Generally
speaking, each facet characterizes a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
along independent axes or dimensions.</dd><dt><a href="#dt-compatibility">for compatibility</a></dt><dd>
for compatibility</dd><dt><a href="#dt-fundamental-facet">fundamental facet</a></dt><dd>
A <b>fundamental facet</b> is an abstract property which
serves to semantically characterize the values in a
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>.
</dd><dt><a href="#dt-inclusive-lower-bound">inclusive lower bound</a></dt><dd>
A value <em>l</em> in an <a class="termref" href="#dt-ordered"><span class="arrow">&#xb7;</span>ordered<span class="arrow">&#xb7;</span></a>
&#xa0;<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>&#xa0;<em>L</em>
is said to be an <b>inclusive lower bound</b> of a
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>&#xa0;<em>V</em>
(where <em>V</em> is a subset of <em>L</em>)
if for all <em>v</em> in <em>V</em>,
<em>l</em> &lt;= <em>v</em>.
</dd><dt><a href="#dt-inclusive-upper-bound">inclusive upper bound</a></dt><dd>
A value <em>u</em> in an <a class="termref" href="#dt-ordered"><span class="arrow">&#xb7;</span>ordered<span class="arrow">&#xb7;</span></a>
&#xa0;<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>&#xa0;<em>U</em>
is said to be an <b>inclusive upper bound</b> of a
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>&#xa0;<em>V</em>
(where <em>V</em> is a subset of <em>U</em>)
if for all <em>v</em> in <em>V</em>,
<em>u</em> &gt;= <em>v</em>.
</dd><dt><a href="#dt-incomparable">incomparable</a></dt><dd>When  <em>a &lt;&gt; b</em>, <em>a</em> and <em>b</em> are <b>incomparable</b>,</dd><dt><a href="#dt-itemType">itemType</a></dt><dd>
The <a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a> or <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a>
datatype that participates in the definition of a <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> datatype
is known as the <b>itemType</b> of that <a class="termref" href="#dt-list"><span class="arrow">&#xb7;</span>list<span class="arrow">&#xb7;</span></a> datatype.
</dd><dt><a href="#dt-lexical-space">lexical space</a></dt><dd>A
<b>lexical space</b> is the set of valid <em>literals</em>
for a datatype.
</dd><dt><a href="#dt-list">list</a></dt><dd><b>List</b>
datatypes are those having values each of which consists of a
finite-length (possibly empty) sequence of values of an
<a class="termref" href="#dt-atomic"><span class="arrow">&#xb7;</span>atomic<span class="arrow">&#xb7;</span></a> datatype.
</dd><dt><a href="#dt-match">match</a></dt><dd><b>match</b></dd><dt><a href="#dt-may">may</a></dt><dd><b>may</b></dd><dt><a href="#dt-memberTypes">memberTypes</a></dt><dd>
The datatypes that participate in the
definition of a <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a> datatype are known as the
<b>memberTypes</b> of that <a class="termref" href="#dt-union"><span class="arrow">&#xb7;</span>union<span class="arrow">&#xb7;</span></a> datatype.
</dd><dt><a href="#dt-minimally-conforming">minimally conforming</a></dt><dd>
<b>Minimally conforming</b> processors <a class="termref" href="#dt-must"><span class="arrow">&#xb7;</span>must<span class="arrow">&#xb7;</span></a>
completely and correctly implement the <a class="termref" href="#dt-cos"><span class="arrow">&#xb7;</span>Constraint on Schemas<span class="arrow">&#xb7;</span></a> and
<a class="termref" href="#dt-cvc"><span class="arrow">&#xb7;</span>Validation Rule<span class="arrow">&#xb7;</span></a>
.
</dd><dt><a href="#dt-must">must</a></dt><dd><b>must</b></dd><dt><a href="#dt-non-numeric">non-numeric</a></dt><dd>A datatype whose values
are not <a class="termref" href="#dt-numeric"><span class="arrow">&#xb7;</span>numeric<span class="arrow">&#xb7;</span></a> is said to be
<b>non-numeric</b>.
</dd><dt><a href="#dt-numeric">numeric</a></dt><dd>A datatype is said to be
<b>numeric</b> if its values are conceptually quantities (in some
mathematical number system).
</dd><dt><a href="#dt-order-relation">order-relation</a></dt><dd>An
<b>order relation</b> on a <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>
is a mathematical relation that imposes a
<a class="termref" href="#dt-total-order"><span class="arrow">&#xb7;</span>total order<span class="arrow">&#xb7;</span></a> or a <a class="termref" href="#dt-partial-order"><span class="arrow">&#xb7;</span>partial order<span class="arrow">&#xb7;</span></a> on the
members of the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>.
</dd><dt><a href="#dt-ordered">ordered</a></dt><dd>A
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>, and hence a datatype, is said to be
<b>ordered</b> if there exists an
<a class="termref" href="#dt-order-relation"><span class="arrow">&#xb7;</span>order-relation<span class="arrow">&#xb7;</span></a> defined for that
<a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>.
</dd><dt><a href="#dt-partial-order">partial order</a></dt><dd>
A <b>partial order</b> is an <a class="termref" href="#dt-order-relation"><span class="arrow">&#xb7;</span>order-relation<span class="arrow">&#xb7;</span></a>
that is <b>irreflexive</b>, <b>asymmetric</b> and
<b>transitive</b>.
</dd><dt><a href="#dt-primitive">primitive</a></dt><dd><b>Primitive</b>
datatypes are those that are not defined in terms of other datatypes;
they exist <em>ab initio</em>.
</dd><dt><a href="#dt-regex">regular expression</a></dt><dd>A
<b>regular expression</b> is composed from zero or more
<a class="termref" href="#dt-branch"><span class="arrow">&#xb7;</span>branch<span class="arrow">&#xb7;</span></a>es, separated by <code>|</code> characters.
</dd><dt><a href="#dt-restriction">restriction</a></dt><dd>A datatype is said to be
<a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a> by <b>restriction</b> from another datatype
when values for zero or more <a class="termref" href="#dt-constraining-facet"><span class="arrow">&#xb7;</span>constraining facet<span class="arrow">&#xb7;</span></a>s are specified
that serve to constrain its <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a> and/or its
<a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a> to a subset of those of its
<a class="termref" href="#dt-basetype"><span class="arrow">&#xb7;</span>base type<span class="arrow">&#xb7;</span></a>.
</dd><dt><a href="#dt-src">Schema Representation Constraint</a></dt><dd>
<b>Schema Representation Constraint</b>
</dd><dt><a href="#dt-total-order">total order</a></dt><dd>
A <b>total order</b> is an <a class="termref" href="#dt-partial-order"><span class="arrow">&#xb7;</span>partial order<span class="arrow">&#xb7;</span></a>
such that for no <em>a</em> and <em>b</em>
is it the case that <em>a &lt;&gt; b</em>.
</dd><dt><a href="#dt-union">union</a></dt><dd><b>Union</b>
datatypes are those whose <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>s and
<a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a>s are the union of
the <a class="termref" href="#dt-value-space"><span class="arrow">&#xb7;</span>value space<span class="arrow">&#xb7;</span></a>s and
<a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a>s of one or more other datatypes.
</dd><dt><a href="#dt-user-derived">user-derived</a></dt><dd>
<b>User-derived</b> datatypes are those <a class="termref" href="#dt-derived"><span class="arrow">&#xb7;</span>derived<span class="arrow">&#xb7;</span></a>
datatypes that are defined by individual schema designers.
</dd><dt><a href="#dt-cvc">Validation Rule</a></dt><dd>
<b>Validation Rule</b>
</dd><dt><a href="#dt-value-space">value space</a></dt><dd>A <b>value
space</b> is the set of values for a given datatype.
Each value in the <b>value space</b> of a datatype is denoted by
one or more literals in its <a class="termref" href="#dt-lexical-space"><span class="arrow">&#xb7;</span>lexical space<span class="arrow">&#xb7;</span></a>.
</dd></dl></div><div class="div1">
<h2><a id="biblio" name="biblio"/>H References</h2><div class="div2">
<h3><span class="nav"> <a class="nav" href="#non-normative-biblio"><img src="next.jpg" alt="next sub-section"/></a></span><a id="normative-biblio" name="normative-biblio"/>H.1 Normative</h3><dl><dt class="label"><a id="clinger1990" name="clinger1990"/>Clinger, WD (1990)</dt><dd>
William D Clinger. <em>How to Read Floating Point Numbers Accurately.</em>
In <em>Proceedings of Conference on Programming Language Design and
Implementation</em>, pages 92-101.
Available at: <a href="ftp://ftp.ccs.neu.edu/pub/people/will/howtoread.ps">
ftp://ftp.ccs.neu.edu/pub/people/will/howtoread.ps</a>
</dd><dt class="label"><a id="ieee754" name="ieee754"/>IEEE 754-1985</dt><dd>
IEEE. <em>IEEE Standard for Binary Floating-Point Arithmetic.</em>
See <a href="http://standards.ieee.org/reading/ieee/std_public/description/busarch/754-1985_desc.html">
http://standards.ieee.org/reading/ieee/std_public/description/busarch/754-1985_desc.html</a>
</dd><dt class="label"><a id="XMLNS" name="XMLNS"/>Namespaces in XML</dt><dd>
World Wide Web Consortium.  <em>Namespaces in XML</em>. Available at:
<a href="http://www.w3.org/TR/1999/REC-xml-names-19990114/">http://www.w3.org/TR/1999/REC-xml-names-19990114/</a>
</dd><dt class="label"><a id="RFC1766" name="RFC1766"/>RFC 1766</dt><dd>
H. Alvestrand, ed. <em>RFC 1766: Tags for the Identification of Languages</em>
1995. Available at: <a href="http://www.ietf.org/rfc/rfc1766.txt">
http://www.ietf.org/rfc/rfc1766.txt</a>
</dd><dt class="label"><a id="RFC2045" name="RFC2045"/>RFC 2045</dt><dd>
N. Freed and N. Borenstein. <em>RFC 2045: Multipurpose Internet Mail Extensions
(MIME) Part One: Format of Internet Message Bodies</em>. 1996.  Available at:
<a href="http://www.ietf.org/rfc/rfc2045.txt">
http://www.ietf.org/rfc/rfc2045.txt</a>
</dd><dt class="label"><a id="RFC2396" name="RFC2396"/>RFC 2396</dt><dd>
Tim Berners-Lee, et. al. <em>RFC 2396: Uniform Resource Identifiers (URI):
Generic Syntax.</em>. 1998.  Available at:
<a href="http://www.ietf.org/rfc/rfc2396.txt">
http://www.ietf.org/rfc/rfc2396.txt</a>
</dd><dt class="label"><a id="RFC2732" name="RFC2732"/>RFC 2732</dt><dd>
<em>RFC
2732: Format for Literal IPv6 Addresses in URL's</em>. 1999.
Available at:
<a href="http://www.ietf.org/rfc/rfc2732.txt">
http://www.ietf.org/rfc/rfc2732.txt</a>
</dd><dt class="label"><a id="RFC3066" name="RFC3066"/>RFC 3066</dt><dd>
H. Alvestrand, ed. <em>RFC 3066: Tags for the Identification of Languages</em>
1995. Available at: <a href="http://www.ietf.org/rfc/rfc3066.txt">
http://www.ietf.org/rfc/rfc3066.txt</a>
</dd><dt class="label"><a id="UnicodeDB" name="UnicodeDB"/>Unicode Database</dt><dd>
The Unicode Consortium. <em>The Unicode Character Database</em>.
Available at: <a href="http://www.unicode.org/Public/3.1-Update/UnicodeCharacterDatabase-3.1.0.html">
http://www.unicode.org/Public/3.1-Update/UnicodeCharacterDatabase-3.1.0.html</a>
</dd><dt class="label"><a id="XML" name="XML"/>XML 1.0 (Second Edition)</dt><dd>
World Wide Web Consortium. <em>Extensible Markup Language (XML) 1.0, Second
Edition.</em>
Available at: <a href="http://www.w3.org/TR/2000/WD-xml-2e-20000814">http://www.w3.org/TR/2000/WD-xml-2e-20000814</a>
</dd><dt class="label"><a id="XBase" name="XBase"/>XML Base</dt><dd>


World Wide Web Consortium.  XML Base.
Available at: <a href="http://www.w3.org/TR/2001/REC-xmlbase-20010627/">
http://www.w3.org/TR/2001/REC-xmlbase-20010627/</a>
</dd><dt class="label"><a id="XLink" name="XLink"/>XML Linking Language</dt><dd>
World Wide Web Consortium.  XML Linking Language (XLink).
Available at: <a href="http://www.w3.org/TR/2001/REC-xlink-20010627/">http://www.w3.org/TR/2001/REC-xlink-20010627/.</a>
Note: only the URI reference escaping procedure defined in
Section 5.4 is normatively referenced.

</dd><dt class="label"><a id="structural-schemas" name="structural-schemas"/>XML Schema Part 1: Structures</dt><dd>
XML Schema Part 1: Structures. Available at: <a href="http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html">
http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html</a>
</dd><dt class="label"><a id="schema-requirements" name="schema-requirements"/>XML Schema Requirements</dt><dd>
World Wide Web Consortium.  XML Schema Requirements.  Available at:
<a href="http://www.w3.org/TR/1999/NOTE-xml-schema-req-19990215">
http://www.w3.org/TR/1999/NOTE-xml-schema-req-19990215</a>
</dd></dl></div><div class="div2">
<h3><span class="nav"><a class="nav" href="#normative-biblio"><img src="previous.jpg" alt="previous sub-section"/></a> </span><a id="non-normative-biblio" name="non-normative-biblio"/>H.2 Non-normative</h3><dl><dt class="label"><a id="CharMod" name="CharMod"/>Character Model</dt><dd>
Martin J. D&#xfc;rst and Fran&#xe7;ois Yergeau, eds.
Character Model for the World Wide Web. World Wide Web Consortium
Working Draft. 2001.
Available at:
<a href="http://www.w3.org/TR/2001/WD-charmod-20010126/">http://www.w3.org/TR/2001/WD-charmod-20010126/</a>
</dd><dt class="label"><a id="gay1990" name="gay1990"/>Gay, DM (1990)</dt><dd>
David M. Gay.  <em>Correctly Rounded Binary-Decimal and
Decimal-Binary Conversions.</em> AT&amp;T Bell Laboratories Numerical
Analysis Manuscript 90-10, November 1990.
Available at:
<a href="http://cm.bell-labs.com/cm/cs/doc/90/4-10.ps.gz">
http://cm.bell-labs.com/cm/cs/doc/90/4-10.ps.gz</a>
</dd><dt class="label"><a id="html4" name="html4"/>HTML 4.01</dt><dd>
World Wide Web Consortium.  Hypertext Markup Language, version 4.01.  Available at:
<a href="http://www.w3.org/TR/1999/REC-html401-19991224/">
http://www.w3.org/TR/1999/REC-html401-19991224/</a>
</dd><dt class="label"><a id="draft-masinter-url-i18n-07" name="draft-masinter-url-i18n-07"/>IETF INTERNET-DRAFT: IRIs</dt><dd>
M. D&#xfc;rst and M. Suignard
.
<em>Internationalized Resource Identifiers</em>
2002. Available at:

<a href="http://www.w3.org/International/iri-edit/draft-duerst-iri-04.txt">
http://www.w3.org/International/iri-edit/draft-duerst-iri-04.txt</a>


</dd><dt class="label"><a id="IERS" name="IERS"/>International Earth Rotation Service (IERS)</dt><dd>
International  Earth Rotation Service (IERS).
See <a href="http://maia.usno.navy.mil">http://maia.usno.navy.mil</a>
</dd><dt class="label"><a id="ISO11404" name="ISO11404"/>ISO 11404</dt><dd>
ISO (International Organization for Standardization).
<em>Language-independent Datatypes.</em>  See
<a href="http://www.iso.ch/cate/d19346.html">
 http://www.iso.ch/cate/d19346.html</a>
</dd><dt class="label"><a id="ISO8601" name="ISO8601"/>ISO 8601</dt><dd>
ISO (International Organization for Standardization).
<em>Representations of dates and times, 1988-06-15.</em>

</dd><dt class="label"><a id="ISO8601-1998" name="ISO8601-1998"/>ISO 8601:1998 Draft Revision</dt><dd>
ISO (International Organization for Standardization).
<em>Representations of dates and times, draft revision, 1998.</em>
</dd><dt class="label"><a id="ISO8601-2000" name="ISO8601-2000"/>ISO 8601:2000 Second Edition</dt><dd>
ISO (International Organization for Standardization).
<em>Representations of dates and times, second edition, 2000-12-15.</em>
</dd><dt class="label"><a id="Perl" name="Perl"/>Perl</dt><dd>
The Perl Programming Language.  See <a href="http://www.perl.com/pub/language/info/software.html">
http://www.perl.com/pub/language/info/software.html</a>
</dd><dt class="label"><a id="RDFSchema" name="RDFSchema"/>RDF Schema</dt><dd>
World Wide Web Consortium. <em>RDF Schema Specification.</em>
Available at:
<a href="http://www.w3.org/TR/2000/CR-rdf-schema-20000327/">
http://www.w3.org/TR/2000/CR-rdf-schema-20000327/</a>
</dd><dt class="label"><a id="ruby" name="ruby"/>Ruby</dt><dd>
World Wide Web Consortium.  Ruby Annotation.  Available at:
<a href="http://www.w3.org/TR/2001/WD-ruby-20010216/">
http://www.w3.org/TR/2001/WD-ruby-20010216/</a>
</dd><dt class="label"><a id="SQL" name="SQL"/>SQL</dt><dd>
ISO (International Organization for Standardization).  <em>ISO/IEC
9075-2:1999, Information technology --- Database languages ---
SQL --- Part 2: Foundation (SQL/Foundation)</em>.
[Geneva]: International Organization for Standardization, 1999.
See <a href="http://www.iso.ch/cate/d26197.html">
http://www.iso.ch/cate/d26197.html</a>
</dd><dt class="label"><a id="USNavy" name="USNavy"/>U.S. Naval Observatory Time Service Department</dt><dd>
<em>Information about Leap Seconds</em>
Available at:
<a href="http://tycho.usno.navy.mil/leapsec.990505.html">http://tycho.usno.navy.mil/leapsec.990505.html</a>
</dd><dt class="label"><a id="unicodeRegEx" name="unicodeRegEx"/>Unicode Regular Expression Guidelines</dt><dd>
Mark Davis.  <em>Unicode Regular Expression Guidelines</em>, 1988.
Available at: <a href="http://www.unicode.org/unicode/reports/tr18/">
http://www.unicode.org/unicode/reports/tr18/</a>
</dd><dt class="label"><a id="schema-primer" name="schema-primer"/>XML Schema Language: Part 0 Primer</dt><dd>
World Wide Web Consortium.  XML Schema Language: Part 0 Primer.  Available at:
<a href="http://www.w3.org/TR/2004/REC-xmlschema-0-20041028/primer.html">
http://www.w3.org/TR/2004/REC-xmlschema-0-20041028/primer.html</a>
</dd><dt class="label"><a id="XSL" name="XSL"/>XSL</dt><dd>
World Wide Web Consortium.
<em>Extensible Stylesheet Language (XSL).</em>
Available at: <a href="http://www.w3.org/TR/2000/CR-xsl-20001121/">
http://www.w3.org/TR/2000/CR-xsl-20001121/</a>
</dd></dl></div></div><div class="div1">
<h2><a id="acknowledgments" name="acknowledgments"/>I Acknowledgements (non-normative)</h2><p>The following have contributed material to the first edition of this specification:</p><blockquote><p>Asir S. Vedamuthu, webMethods, Inc<br/>Mark Davis, IBM</p></blockquote><p>
Co-editor Ashok Malhotra's work on this specification from March 1999 until
February 2001 was supported by IBM.  From February 2001 until May 2004 it
was supported by Microsoft.
</p><p>
The editors acknowledge the members of the XML Schema Working Group, the members of other W3C Working Groups, and industry experts in other
forums who have contributed directly or indirectly to the process or content of
creating this document. The Working Group is particularly grateful to Lotus
Development Corp. and IBM for providing teleconferencing facilities.
</p><p>
At the time the first edition of this
specification was published, the members of the XML Schema Working Group 

were:</p><ul><li>Jim Barnette, Defense Information Systems Agency (DISA)</li><li>Paul V. Biron, Health Level Seven</li><li>Don Box, DevelopMentor</li><li>Allen Brown, Microsoft</li><li>Lee Buck, TIBCO Extensibility</li><li>Charles E. Campbell, Informix</li><li>Wayne Carr, Intel</li><li>Peter Chen, Bootstrap Alliance and LSU</li><li>David Cleary, Progress Software</li><li>Dan Connolly, W3C (<i>staff contact</i>) </li><li>Ugo Corda, Xerox</li><li>Roger L. Costello, MITRE</li><li>Haavard Danielson, Progress Software</li><li>Josef Dietl, Mozquito Technologies</li><li>David Ezell, Hewlett-Packard Company
 </li><li>Alexander Falk, Altova GmbH</li><li>David Fallside, IBM</li><li>Dan Fox, Defense Logistics Information Service (DLIS)</li><li>Matthew Fuchs, Commerce One</li><li>Andrew Goodchild, Distributed Systems Technology Centre (DSTC Pty Ltd)</li><li>Paul Grosso, Arbortext, Inc</li><li>Martin Gudgin, DevelopMentor</li><li>Dave Hollander, Contivo, Inc (<i>co-chair</i>) </li><li>Mary Holstege, Invited Expert</li><li>Jane Hunter, Distributed Systems Technology Centre (DSTC Pty Ltd)</li><li>Rick Jelliffe, Academia Sinica</li><li>Simon Johnston, Rational Software</li><li>Bob Lojek, Mozquito Technologies</li><li>Ashok Malhotra, Microsoft</li><li>Lisa Martin, IBM</li><li>Noah Mendelsohn, Lotus Development Corporation</li><li>Adrian Michel, Commerce One</li><li>Alex Milowski, Invited Expert</li><li>Don Mullen, TIBCO Extensibility</li><li>Dave Peterson, Graphic Communications Association</li><li>Jonathan Robie, Software AG</li><li>Eric Sedlar, Oracle Corp.</li><li>C. M. Sperberg-McQueen, W3C (<i>co-chair</i>) </li><li>Bob Streich, Calico Commerce</li><li>William K. Stumbo, Xerox</li><li>Henry S. Thompson, University of Edinburgh</li><li>Mark Tucker, Health Level Seven</li><li>Asir S. Vedamuthu, webMethods, Inc</li><li>Priscilla Walmsley, XMLSolutions</li><li>Norm Walsh, Sun Microsystems</li><li>Aki Yoshida, SAP AG</li><li>Kongyi Zhou, Oracle Corp.</li></ul><p>The XML Schema Working Group has benefited in its work from the
participation and contributions of a number of people not currently
members of the Working Group, including
in particular those named below.  Affiliations given are those current at
the time of their work with the WG.
</p><ul><li>Paula Angerstein, Vignette Corporation</li><li>David Beech, Oracle Corp.</li><li>Gabe Beged-Dov, Rogue Wave Software</li><li>Greg Bumgardner, Rogue Wave Software</li><li>Dean Burson, Lotus Development Corporation</li><li>Mike Cokus, MITRE</li><li>Andrew Eisenberg, Progress Software</li><li>Rob Ellman, Calico Commerce</li><li>George Feinberg, Object Design</li><li>Charles Frankston, Microsoft</li><li>Ernesto Guerrieri, Inso</li><li>Michael Hyman, Microsoft</li><li>Renato Iannella, Distributed Systems Technology Centre (DSTC Pty Ltd)</li><li>Dianne Kennedy, Graphic Communications Association</li><li>Janet Koenig, Sun Microsystems</li><li>Setrag Khoshafian, Technology Deployment International (TDI)</li><li>Ara Kullukian, Technology Deployment International (TDI)</li><li>Andrew Layman, Microsoft</li><li>Dmitry Lenkov, Hewlett-Packard Company</li><li>John McCarthy, Lawrence Berkeley National Laboratory</li><li>Murata Makoto, Xerox</li><li>Eve Maler, Sun Microsystems</li><li>Murray Maloney, Muzmo Communication, acting for Commerce One</li><li>Chris Olds, Wall Data</li><li>Frank Olken, Lawrence Berkeley National Laboratory</li><li>Shriram Revankar, Xerox</li><li>Mark Reinhold, Sun Microsystems</li><li>John C. Schneider, MITRE</li><li>Lew Shannon, NCR</li><li>William Shea, Merrill Lynch</li><li>Ralph Swick, W3C</li><li>Tony Stewart, Rivcom</li><li>Matt Timmermans, Microstar</li><li>Jim Trezzo, Oracle Corp.</li><li>Steph Tryphonas, Microstar</li></ul><p>The lists given above pertain to the first edition.
At the time work on this second edition was completed,
the membership of the Working Group was:</p><ul><li>Leonid Arbouzov, Sun Microsystems</li><li>Jim Barnette, Defense Information Systems Agency (DISA)</li><li>Paul V. Biron, Health Level Seven</li><li>Allen Brown, Microsoft</li><li>Charles E. Campbell, Invited expert</li><li>Peter Chen, Invited expert</li><li>Tony Cincotta, NIST</li><li>David Ezell, National Association of Convenience Stores</li><li>Matthew Fuchs, Invited expert</li><li>Sandy Gao, IBM</li><li>Andrew Goodchild, Distributed Systems Technology Centre (DSTC Pty Ltd)</li><li>Xan Gregg, Invited expert</li><li>Mary Holstege, Mark Logic</li><li>Mario Jeckle, DaimlerChrysler</li><li>Marcel Jemio, Data Interchange Standards Association</li><li>Kohsuke Kawaguchi, Sun Microsystems</li><li>Ashok Malhotra, Invited expert</li><li>Lisa Martin, IBM</li><li>Jim Melton, Oracle Corp</li><li>Noah Mendelsohn, IBM</li><li>Dave Peterson, Invited expert</li><li>Anli Shundi, TIBCO Extensibility</li><li>C. M. Sperberg-McQueen, W3C (<i>co-chair</i>) </li><li>Hoylen Sue, Distributed Systems Technology Centre (DSTC Pty Ltd)</li><li>Henry S. Thompson, University of Edinburgh</li><li>Asir S. Vedamuthu, webMethods, Inc</li><li>Priscilla Walmsley, Invited expert</li><li>Kongyi Zhou, Oracle Corp.</li></ul><p>
We note with sadness the accidental death of Mario Jeckle
shortly after the completion of work on this document.  
In addition to those named above, several
people served on the Working Group during the development
of this second edition:
</p><ul><li>Oriol Carbo, University of Edinburgh</li><li>Tyng-Ruey Chuang, Academia Sinica</li><li>Joey Coyle, Health Level 7</li><li>Tim Ewald, DevelopMentor</li><li>Nelson Hung, Corel</li><li>Melanie Kudela, Uniform Code Council</li><li>Matthew MacKenzie, XML Global</li><li>Cliff Schmidt, Microsoft</li><li>John Stanton, Defense Information Systems Agency</li><li>John Tebbutt, NIST</li><li>Ross Thompson, Contivo</li><li>Scott Vorthmann, TIBCO Extensibility</li></ul></div></div></body></html>