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NOTE-xml-events2-20101216 91.7 KB
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  <title>XML Events 2</title>
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<body>

















































































































<div class="head">
<a href="http://www.w3.org/"><img height="48" width="72" alt="W3C"
src="http://www.w3.org/Icons/w3c_home" /></a> 









<h1 id="title" > XML Events 2
</h1>








<h2 id="subtitle" > An Events Syntax for XML
</h2>










<h2 id="w3c-doctype" > W3C Working Group Note 16 December 2010
</h2>










<dl>
  <dt>This version:</dt>

    <dd><a href="http://www.w3.org/TR/2010/NOTE-xml-events2-20101216">http://www.w3.org/TR/2010/NOTE-xml-events2-20101216</a>

</dd>

  <dt>Latest version:</dt>
    <dd><a href="http://www.w3.org/TR/xml-events2">http://www.w3.org/TR/xml-events2</a></dd>

  
  <dt>Previous version:</dt>
  <dd><a href="http://www.w3.org/TR/2007/WD-xml-events-20070216">http://www.w3.org/TR/2007/WD-xml-events-20070216</a></dd>

  <dt>Diff from previous version:</dt>
    <dd><a href="xml-events-diff.html">xml-events-diff.html</a></dd>

  <dt>Previous recommendation:</dt>
  <dd><a href="http://www.w3.org/TR/2003/REC-xml-events-20031014">http://www.w3.org/TR/2003/REC-xml-events-20031014</a></dd>

  <dt>Diff from previous recommendation:</dt>
    <dd><a href="xml-events-rec-diff.html">xml-events-rec-diff.html</a></dd>

  <dt>Editors:</dt>
    <dd><a href="mailto:shane@aptest.com">Shane McCarron</a>,
        <a href="http://www.aptest.com">Applied Testing and Technology,
            <abbr title="Incorporated">Inc.</abbr></a><br />
  <a href="mailto:mark.birbeck@sidewinderlabs.com">Mark Birbeck</a>,
  <a href="http://sidewinderlabs.com/">Sidewinder Labs</a><br />
        Roland Merrick, <a href="http://www.IBM.com">IBM</a>
    </dd>


  <dt>Version 1 Editors:</dt>
    <dd><a href="mailto:shane@aptest.com">Shane McCarron</a>,
        <a href="http://www.aptest.com">Applied Testing and Technology,
        <abbr title="Incorporated">Inc.</abbr></a><br />

      <a href="http://www.cwi.nl/~steven/">Steven Pemberton</a>,
      <a href="http://www.cwi.nl"><abbr xml:lang="nl" title="Centrum voor Wiskunde en Informatica">CWI</abbr></a>/<a href="http://www.w3.org/"><abbr title="World Wide Web Consortium">W3C</abbr></a><sup>&#xae;</sup><br />

      <a href="mailto:tvraman@almaden.ibm.com">T. V. Raman</a>,
      <a href="http://www.ibm.com"><abbr title="International Business Machines">IBM</abbr> Corporation</a></dd>
</dl>



<p>This document is also available in these non-normative formats:
<a href="xml-events.ps">PostScript version</a>,
<a href="xml-events.pdf">PDF version</a>,
<a href="xml-events.zip">ZIP archive</a>, and
<a href="xml-events.tgz">Gzip'd TAR archive</a>.</p>

<p>The English version of this specification is the only normative version.
Non-normative  <a href="http://www.w3.org/Consortium/Translation/"
>translations</a> may also be available.</p>

<p id="copyright" class="copyright"><a href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> &copy; 2003-2010 <a href="http://www.w3.org/"><acronym title="World Wide Web Consortium">W3C</acronym></a><sup>&reg;</sup> (<a href="http://www.csail.mit.edu/"><acronym title="Massachusetts Institute of Technology">MIT</acronym></a>, <a href="http://www.ercim.eu/"><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> rules apply.</p>
</div>

<hr />








<h2 id="abstract" > Abstract
</h2>


<p>This specification defines three modules:  XML Events to define events
and their characteristics; XML Handlers to define mappings between events
and actions; and XML Scripting to assist in defining functions to
support the handlers.
These modules work together to provide XML languages
with the ability to uniformly integrate event listeners and associated event
handlers with Document Object Model (DOM) Level 3 event interfaces
[<a class="nref" href="#ref_DOM3EVENTS">DOM3EVENTS</a>]. The result is to provide an interoperable way of
associating behaviors with document-level markup.</p>








<h2 id="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 document is a Working Group Note.  The XHTML2 Working Group's
charter expired before it could complete work on this document.  
Related work is being done by the <a
href="http://www.w3.org/MarkUp/Forms/">Forms Working
Group</a>.</p>

<p>Publication as a Working Group Note does not imply endorsement by
the W3C Membership. This is a draft document and may be updated,
replaced or obsoleted by other documents at any time. It is
inappropriate to cite this document as other than work in
progress.</p>

<p>This document has been produced by the <a href="http://www.w3.org/MarkUp/">W3C XHTML 2 Working Group</a> as part of the <a href="http://www.w3.org/MarkUp/Activity">HTML Activity</a>. The goals of
the XHTML 2 Working Group are discussed in the <a href="http://www.w3.org/2007/03/XHTML2-WG-charter">XHTML 2 Working Group charter</a>.</p>

<p>This document was produced by a group operating under the <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5 February 2004 W3C Patent Policy</a>. W3C maintains a <a rel="disclosure"
href="http://www.w3.org/2004/01/pp-impl/32107/status">public list of any patent disclosures</a> made in connection with the deliverables of the group; that page also includes instructions for
disclosing a patent. An individual who has actual knowledge of a patent which the individual believes contains <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#def-essential">Essential
Claim(s)</a> must 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>Public discussion of HTML takes place on
<a href="mailto:www-html@w3.org">www-html@w3.org</a>
(<a href="http://lists.w3.org/Archives/Public/www-html/">archive</a>).
To subscribe send an email to
<a href="mailto:www-html-request@w3.org">www-html-request@w3.org</a>
with the word <em>subscribe</em> in the subject line.</p>

<p>Please report errors in this document to
<a href="mailto:www-html-editor@w3.org">www-html-editor@w3.org</a>
(<a href="http://lists.w3.org/Archives/Public/www-html-editor/">archive</a>).
</p>









<h1 id="contents" > Contents
</h1>


<div class="toc">
<ul class='toc'><li class='tocline'>
1.
<a href="#s_intro" class="tocxref"> Introduction</a>

</li><li class='tocline'>2.
<a href="#s_event_module_conformance" class="tocxref"> Conformance Requirements</a>

<ul class="toc"><li class='tocline'>2.1.
<a href="#docconf" class="tocxref"> Document Conformance</a>

</li><li class='tocline'>2.2.
<a href="#hostconf" class="tocxref"> Host Language Conformance</a>

</li><li class='tocline'>2.3.
<a href="#processorConf" class="tocxref"> Host Language Processor Conformance</a>

</li></ul></li><li class='tocline'>3.
<a href="#s_event_module_elements" class="tocxref"> The XML Events Module</a>

<ul class="toc"><li class='tocline'>3.1.
<a href="#section-listener-element" class="tocxref"> The listener Element</a>

<ul class="toc"><li class='tocline'>3.1.1.
<a href="#sec_3.1.1." class="tocxref"> Examples of listener Usage</a>

</li></ul></li><li class='tocline'>3.2.
<a href="#section-listener-observer" class="tocxref"> Attaching Attributes Directly
to the Observer Element</a>

<ul class="toc"><li class='tocline'>3.2.1.
<a href="#sec_3.2.1." class="tocxref">  Examples of Using Attributes Attached to an Observer Element</a>

</li></ul></li><li class='tocline'>3.3.
<a href="#section-listener-handler" class="tocxref"> Attaching Attributes Directly to the Handler Element</a>

<ul class="toc"><li class='tocline'>3.3.1.
<a href="#sec_3.3.1." class="tocxref"> Examples of Using Attributes Attached to a Handler Element</a>

</li></ul></li><li class='tocline'>3.4.
<a href="#section-attributedefaulting" class="tocxref"> Summary of Observer and Handler Attribute Defaulting</a>

</li><li class='tocline'>3.5.
<a href="#sec_3.5." class="tocxref"> Event Scope</a>

</li><li class='tocline'>3.6.
<a href="#sec_3.6." class="tocxref"> Listener Registration</a>

</li></ul></li><li class='tocline'>4.
<a href="#s_handler_module_elements" class="tocxref"> The XML Handlers Module</a>

<ul class="toc"><li class='tocline'>4.1.
<a href="#section-action-element" class="tocxref"> The action Element</a>

</li><li class='tocline'>4.2.
<a href="#section-dispatchEvent-element" class="tocxref"> The dispatchEvent Element</a>

</li><li class='tocline'>4.3.
<a href="#section-addEventListener-element" class="tocxref"> The addEventListener element</a>

</li><li class='tocline'>4.4.
<a href="#section-removeEventListener-element" class="tocxref"> The removeEventListener element</a>

</li><li class='tocline'>4.5.
<a href="#section-stopPropagation-element" class="tocxref"> The stopPropagation element</a>

</li><li class='tocline'>4.6.
<a href="#section-preventDefault-element" class="tocxref"> The preventDefault element</a>

</li></ul></li><li class='tocline'>5.
<a href="#s_script_module" class="tocxref"> The XML Scripting Module</a>

<ul class="toc"><li class='tocline'>5.1.
<a href="#section-script-element" class="tocxref"> The script Element</a>

</li></ul></li><li class='tocline'>6.
<a href="#section-event-naming" class="tocxref"> Naming Event Types</a>

</li><li class='tocline'>7.
<a href="#section-conditional-expressions" class="tocxref"> Conditional Expressions</a>

<ul class="toc"><li class='tocline'>7.1.
<a href="#conditional-function-library" class="tocxref"> Function Library</a>

<ul class="toc"><li class='tocline'>7.1.1.
<a href="#event-function" class="tocxref"> Event Function</a>

</li></ul></li></ul></li><li class='tocline'>A.
<a href="#a_DTD_definition" class="tocxref"> DTD Implementation</a>

<ul class="toc"><li class='tocline'>A.1.
<a href="#a_module_qname" class="tocxref"> Qualified Names Module</a>

</li><li class='tocline'>A.2.
<a href="#a_module_xml_events" class="tocxref"> XML Events Module</a>

</li><li class='tocline'>A.3.
<a href="#a_module_xml_handlers" class="tocxref"> XML Handlers Module</a>

</li><li class='tocline'>A.4.
<a href="#a_module_xml_script" class="tocxref"> XML Scripting Module</a>

</li></ul></li><li class='tocline'>B.
<a href="#a_Schema_definition" class="tocxref"> Schema Implementation</a>

<ul class="toc"><li class='tocline'>B.1.
<a href="#a_schema_attribs" class="tocxref"> Attributes Module</a>

</li><li class='tocline'>B.2.
<a href="#a_schema_xml_events" class="tocxref"> XML Events Module</a>

</li><li class='tocline'>B.3.
<a href="#a_schema_xml_handlers" class="tocxref"> XML Handlers Module</a>

</li><li class='tocline'>B.4.
<a href="#a_schema_xml_script" class="tocxref"> XML Scripting Module</a>

</li></ul></li><li class='tocline'>C.
<a href="#s_refs" class="tocxref"> References</a>

<ul class="toc"><li class='tocline'>C.1.
<a href="#s_norm-refs" class="tocxref"> Normative References</a>

</li><li class='tocline'>C.2.
<a href="#s_other-refs" class="tocxref"> Other References</a>

</li></ul></li><li class='tocline'>D.
<a href="#s_changes" class="tocxref"> Change History</a>

</li><li class='tocline'>E.
<a href="#s_acks" class="tocxref"> Acknowledgments</a>

</li></ul>
</div>




<!--OddPage-->



      
      
    




<h1 id="s_intro" >1. Introduction
</h1>



	
	


<p><em>This section is informative.</em></p>

<p>An <em>event</em> is the representation of some asynchronous occurrence
(such as a mouse click on the presentation of the element, or an arithmetical
error in the value of an attribute of the element, or any of unthinkably many
other possibilities) that gets associated with an element (<em>targeted</em> at it) in an XML
document.</p>

<p>In the DOM model of events [<a class="nref" href="#ref_DOM3EVENTS">DOM3EVENTS</a>], the general
behavior is that when an event occurs it is <em>dispatched</em> by passing it
down the document tree in a phase called <em>capture</em> to the element
where the event occurred (called its <em>target</em>), where it then may be
passed back up the tree again in the phase called <em>bubbling</em>. In
general an event can be responded to at any element in the path (an <em>observer</em>) in either
phase by causing an action, and/or by stopping the event, and/or by
cancelling the default action for the event. The following diagram illustrates this:</p>

<p>
<img src="images/event-flow.png" alt="Event propagation flow diagram"
longdesc="#event-flow-desc" />
<br />
<em id="event-flow-desc">Event flow in DOM3: an event targeted at an element (marked 'target') in the tree passes down the tree from the root to the target in the phase called 'capture'. 
When it arrives at the target it is in the 'target' (or 'at-target') phase. If the event type allows it, the event then travels back up the tree by the same route in a phase called 'bubbling'. Any node in the route, including the root node and the target, may be an 'observer': that is to say, a handler may be attached to it that is activated when the event passes through in either phase. A handler can only listen for one phase. To listen for both you have to attach two handlers.</em></p>

<p>An <em>action</em> is some way of responding to an event; a
<em>handler</em> is some specification for such an action, for instance using
scripting or some other method. A <em>listener</em> is a binding of such a
handler to an event targeting some element in a document.</p>

<p>HTML [<a class="nref" href="#ref_HTML4">HTML4</a>] binds events to an element by
encoding the event name in an attribute name, such that the value of the
attribute is the action for that event at that element. This method has two
main disadvantages: firstly it hardwires the events into the language, so
that to add a new event, you have to make a change to the language, and
secondly it forces you to mix the content of the document with the
specifications of the scripting and event handling, rather than allowing you
to separate them out.
SVG [<a class="nref" href="#ref_SVG">SVG</a>] uses a similar method.</p>

<p>The process of defining XHTML and related markup languages
identified the need for an
extensible event specification method. The design requirements were the
following:</p>
<ul>
  <li>Syntactically expose the DOM event model to an XML document
     [<a class="nref" href="#ref_XML">XML</a>].</li>
  <li>Provide for new event types without requiring modification to the DOM
    or the DTD.</li>
  <li>Allow for integration with other XML languages.</li>
</ul>

<p>The DOM specifies an event model that provides the following features:</p>
<ul>
  <li>A generic event system,</li>
  <li>Means for registering event listeners and handlers,</li>
  <li>Means for routing events through a tree structure,</li>
  <li>Access to context information for each event, and</li>
  <li>A definition of event flow, as sketched above.</li>
</ul>

<p>The elements and attributes defined in this
specification are the method of binding a DOM level 3 event at an element to
an event handler. They encapsulate various aspects of the DOM level 3 event
interface, thereby providing markup-level specification of the actions to be
taken during the various phases of event propagation.</p>

<p>This document neither specifies particular events, nor mandates any
particular methods of specifying actions. These definitions are left to any
markup language using the facilities described here.</p>

<!--OddPage-->



      
      
    




<h1 id="s_event_module_conformance" >2. Conformance Requirements
</h1>



	
	


<p>This section is <em>normative</em>.</p>
<p>
The keywords "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD",
"RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as
described in [<a class="nref" href="#ref_RFC2119">RFC2119</a>].
</p>







<h2 id="docconf" >2.1. Document Conformance
</h2>






<p>XML Events is not a stand-alone document type.  It is intended to
be integrated into other Host Languages such as XHTML.
A conforming XML Events document is a document that
requires only the facilities described as mandatory in this
specification and the facilities described as mandatory in its Host Language.
Such a document must meet all the following
criteria:</p>

<ol>
<li>
<p><span class="must"  >The document MUST conform to the constraints expressed in
<a href='#a_Schema_definition'>Appendix&#160;B -
Schema Implementation</a> or
<a href='#a_DTD_definition'>Appendix&#160;A - 
DTD Implementation</a>, combined with the constraints expressed in its
Host Language implementation.</span></p>
</li>

<li>
<p><span class="must"  >If the Host Language does not incorporate XML Events 
elements and attributes into its own namespace, 
the document MUST contain an <code>xmlns</code> declaration for the XML Events namespace
[<a class="nref" href="#ref_XMLNAMES">XMLNAMES</a>]</span>.
The namespace for XML Events is
defined to be 
<code>http://www.w3.org/2001/xml-events</code>.
An example start tag of a root element might look like:</p>
<div class="good">
<pre>
&lt;html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"
      xmlns:ev="http://www.w3.org/2001/xml-events" &gt;
</pre>
</div>
</li>

</ol>








<h2 id="hostconf" >2.2. Host Language Conformance
</h2>






<p><span class="must"  >When XML Events are included in a Host Language, all of the
facilities required in this specification MUST be included in the Host
Language</span>.  <span class="must"  >In addition, the mandatory elements and attributes defined in this
specification MUST be included in the content model of the Host
Language</span>.
</p>









<h2 id="processorConf" >2.3. Host Language Processor Conformance
</h2>






<p><span class="must"  >A conforming Host Language Processor MUST support all of the features required
in this specification.</span></p>

<!--OddPage-->



      
      
    




<h1 id="s_event_module_elements" >3. The XML Events Module
</h1>



	
	


<p><em>This section is normative.</em></p>

<p>This specification defines a module called XML Events. The XML Events
module uses the XML namespace [<a class="nref" href="#ref_XMLNAMES">XMLNAMES</a>] identifier
<code>http://www.w3.org/2001/xml-events</code>.</p>

<p>Examples in this document that use the namespace prefix "<code>ev</code>"
all assume an <code>xmlns</code> declaration
<code>xmlns:ev="http://www.w3.org/2001/xml-events"</code> somewhere suitable
in the document involved. All examples are informative.</p>

<p>The remainder of this section describes the elements and attributes in
this module, the semantics, and provides an abstract module definition as
required in [<a class="nref" href="#ref_XHTMLMOD">XHTMLMOD</a>].</p>

<p>The XML Events Module supports the following element and attributes:</p>

<table cellpadding="3" class="moduledef" border="1"
summary="Element and Attributes for XML Events Module">
  <thead>
    <tr>
      <th>Element</th>
      <th>Attributes</th>
      <th>Minimal Content Model</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td><a href="#section-listener-element">listener</a></td>
      <td>event (<span class="datatype"><a
        href="http://www.w3.org/TR/xhtml-modularization/abstraction.html#dt_QNames">QNames</a></span>),<br />
          observer (<span class="datatype"><a
        href="http://www.w3.org/TR/xhtml-modularization/abstraction.html#dt_IDREFS">IDREFS</a></span>),<br />
          eventTarget (<span class="datatype"><a
        href="http://www.w3.org/TR/xhtml-modularization/abstraction.html#dt_IDREFS">IDREFS</a></span>),<br />
          function (<span class="datatype"><a
        href="http://www.w3.org/TR/xhtml-modularization/abstraction.html#dt_CDATA">CDATA</a></span>),<br />
          handler (<span class="datatype"><a
        href="http://www.w3.org/TR/xhtml-modularization/abstraction.html#dt_URI">URI</a></span>),<br />
          phase ("bubble" | "capture" | "default"* | "target"),<br />
          propagate ("stop" | "continue"*),<br />
          defaultAction ("cancel" | "perform"*),<br />
          xml:id ([<a class="nref" href="#ref_XMLID">XMLID</a>])<br />
      </td>
      <td>EMPTY</td>
  </tr>
  </tbody>
</table>

<p>Implementations: <a href="#a_module_xml_events">DTD</a>,
<a href="#a_schema_xml_events">XML Schema</a></p>








<h2 id="section-listener-element" >3.1. The listener Element
</h2>





<p>Element <code>listener</code> supports a subset of the DOM's
<code>EventListener</code> interface. It is used to declare event listeners
and register them with specific nodes in the DOM, and has the following
attributes:</p>
<dl>
  <dt><a id="attr-listener-event">event</a></dt>
  <dd>The required <code>event</code> attribute specifies one, or more, event types
  for which the listener is being registered.</dd>
  <dt><a id="attr-listener-observer"></a>observer</dt>
    <dd>The optional <code>observer</code> attribute specifies the
      <code>id</code> of one, or more, elements with which the event listener is to be
      registered. If this attribute is not present, the observer is the
      element that the <code>event</code> attribute is on (see later under
      "<a href="#section-listener-observer">Attaching Attributes Directly to
      the Observer Element</a>"), or the parent of that element (see later
      under "<a href="#section-listener-handler">Attaching Attributes
      Directly to the Handler Element</a>").

  </dd>

  <dt><a id="attr-listener-eventTarget">eventTarget</a></dt>

    <dd>The optional <code>eventTarget</code> attribute specifies the
      <code>id</code> of one, or more, target elements of the event (i.e., the node that
      caused the event). If this attribute is present, only events that match
      both the <code>event</code> and <code>eventTarget</code> attributes will be
      processed by the associated event handler. Clearly because of the way
      events propagate, the target element should be a descendent node of 
      the observer element, or the observer element itself.
      <p>Use of this attribute requires care; for instance, if you specify</p>




<div class="example">
<pre>
&lt;listener event="click" observer="para1" eventTarget="link1" handler="#clicker"/&gt;
...
&lt;p id="para1"&gt;
    Here is some content in a paragraph that includes a link to
    &lt;a id="link1" href="Overview.html"&gt;the 
        &lt;em&gt;draft&lt;/em&gt;
    document&lt;/a&gt;.
&lt;/p&gt;
</pre>
</div>
      <p>and the user happens to click on the word "draft", the
      <code>em</code> element, and not the <code>a</code>,
      will be the target, and so the handler will not be activated; to catch
      all mouse clicks on the <code>a</code> element and its children,
      use <code>observer="link1"</code>, and no <code>eventTarget</code>
      attribute.</p>
    </dd>
  <dt id="attr-listener-function">function</dt>
  <dd>The <code>function</code> attribute identifies an optional
  function name that will be called when the event reaches the observer.</dd>
  <dt><a id="attr-listener-handler">handler</a></dt>
    <dd>The optional <code>handler</code> attribute specifies the URI reference of a
      resource that defines the action that should be performed if the event
      reaches the observer. 
      If this attribute is not present, the handler is the element that the <code>event</code>
      attribute is on (see later under "<a
      href="#section-listener-handler">Attaching Attributes Directly to the
      Handler Element</a>").
  <p><span class="must"  >If both the <code>function</code> and <code>handler</code> attributes
  are defined, the <code>handler</code> element MUST be ignored.</span></p>
  </dd>
  <dt><a id="attr-listener-phase">phase</a></dt>
     <dd>The optional <code>phase</code> attribute specifies when (during
      which DOM 3 event propagation phase) the listener will be activated by
      the desired event.
      <dl>
        <dt><code>bubble</code></dt>
          <dd>Listener is activated during the bubbling phase.</dd>
        <dt><code>capture</code></dt>
          <dd>Listener is activated during the capture phase.</dd>
        <dt><code>target</code></dt>
          <dd>Listener is activated during the target phase.</dd>
        <dt><code>default</code></dt>
          <dd>Listener is activated during target or bubbling phases.</dd>
      </dl>
      <p>If no <code>phase</code> attribute is specified it is equivalent to having specified <code>phase="default"</code>.</p>
      <p>Note that not all events bubble, in which case with <code>phase="default"</code>
      you can only handle the event by making the event's target the observer. The use of <code>phase="default"</code> is equivalent to invoking the DOM <code>addEventListener</code> method with a <code>useCapture</code> that is <code>false</code>.</p>
    </dd> 
  <dt><a id="attr-listener-propagate">propagate</a></dt>
    <dd>The optional <code>propagate</code> attribute specifies whether after
      processing all listeners at the current node, the event is allowed to
      continue on its path (either in the capture, target, or bubble phase). 
      <dl>
        <dt><code>stop</code></dt>
          <dd>event propagation stops</dd>
        <dt><code>continue</code></dt>
          <dd>event propagation continues (unless stopped by other means,
            such as scripting, or by another listener).</dd>
      </dl>
      <p>The default behavior is <code>propagate="continue"</code>.</p>
    </dd>
  <dt><a id="attr-listener-defaultAction">defaultAction</a></dt>
    <dd>The optional <code>defaultAction</code> attribute specifies whether after
      processing of all listeners for the event, the
      default action for the event (if any) should be performed or not. For
      instance, in XHTML the default action for a mouse click on an
      <code>a</code> element or one of its descendents 
	  is to traverse the link.
      <dl>
        <dt><code>cancel</code></dt>
          <dd>if the event type is cancelable, the default action is
            cancelled</dd>
        <dt><code>perform</code></dt>
          <dd>the default action is performed (unless cancelled by other
            means, such as scripting, or by another listener).</dd>
      </dl>
      <p>The default value is <code>defaultAction="perform"</code>.</p>
      <p>Note that not all events are cancelable, in which case this
      attribute is ignored.</p>
      </dd>
</dl>








<h3 id="sec_3.1.1." >3.1.1. Examples of listener Usage
</h3>





<ol>
  <li><p>This example attaches the handler in the element at
    <code>"#doit"</code> that will get activated when the event called
    <code>activate</code> occurs on the element with
    <code>id="button1"</code>, or any of its children. The activation will
    occur during bubbling, or if the event happened on the observer element
    itself, when the event reaches the element (phase <em>target</em>).</p>
    <pre>&lt;listener event="DOMActivate" observer="button1" handler="#doit"/&gt;</pre>
  </li>
  <li><p>This attaches the handler at <code>#overflow-handler</code> that
    will get activated when the event <code>overflow</code> occurs on the
    element with <code>id="expr1"</code> and bubbles up to the element with
    <code>id="prog1"</code>.</p>
    <pre>&lt;listener event="overflow" observer="prog1" eventTarget="expr1"
        handler="#overflow-handler"/&gt;</pre>
  </li>
  <li><p>This attaches the handler at <code>#popup</code> that will get
    activated whenever an <code>activate</code> event occurs at the element
    with <code>id="embargo"</code> or any of its children. Since it will be
    activated during the capture phase, and propagation is stopped, this will
    have the effect (regardless of what the handler does) of preventing any
    child elements of the <code>embargo</code> element seeing any
    <code>activate</code> events.</p>
    <pre>&lt;listener event="DOMActivate" observer="embargo" handler="#popup"
        phase="capture" propagate="stop"/&gt;</pre>
  </li>
  <li><p>This attaches a handler from another document.</p>
    <pre>&lt;listener event="DOMActivate" observer="image1"
    handler="/handlers/events.xml#activate"/&gt;</pre>
  </li>
</ol>








<h2 id="section-listener-observer" >3.2. Attaching Attributes Directly
to the Observer Element
</h2>






<p id="col_XMLEvents">All the attributes from the <code>listener</code> element with the
exception of <code>id</code> may be used as global attributes, as
defined in <em>Namespaces in XML</em> [<a class="nref" href="#ref_XMLNAMES">XMLNAMES</a>],
to attach the attributes to other elements.
<em>In the schema implementations, 
    this is done by defining the attribute collection <code>XMLEvents</code>.</em>
</p>

<p>Note that this means that the <code>listener</code> element is
strictly speaking redundant, since the following</p>
<pre>&lt;anyelement ev:event="click" ev:observer="button1" ev:handler="#clicker"/&gt;</pre>

<p>would have the same effect as</p>
<pre>&lt;ev:listener event="click" observer="button1" handler="#clicker"/&gt;</pre>

<p>Nonetheless, for utility the <code>listener</code> element has
been retained.</p>

<p>If the <code>observer</code> attribute is omitted (but not the
<code>handler</code> attribute), then the element that the other
attributes are attached to is the observer element.</p>








<h3 id="sec_3.2.1." >3.2.1.  Examples of Using Attributes Attached to an Observer Element
</h3>





<ol>
  <li><p>This first example will attach the handler identified by
    <code>"#popper"</code> to the <code>a</code> element, and cancel
    the default action for the event.</p>
    <pre>&lt;a href="doc.html" ev:event="DOMActivate" ev:handler="#popper"
   ev:defaultAction="cancel"&gt;The document&lt;/a&gt;</pre>
  </li>
  <li><p>This will attach the handler at <code>#handle-overflow</code> for
    the event <code>overflow</code> to the current element.</p>
    <pre>&lt;div ev:event="overflow" ev:handler="#handle-overflow"&gt; ... &lt;/div&gt;</pre>
  </li>
</ol>








<h2 id="section-listener-handler" >3.3. Attaching Attributes Directly to the Handler Element
</h2>






<p>If, when attaching the global attributes to an element, the <code>handler</code> attribute is 
omitted then the element that the other attributes are attached to is the handler element.</p>

<p>Note that, since the <code>observer</code> and <code>eventTarget</code>
attributes are IDREFs, in this case the handler and observer/target elements
must be in the same document (while in other cases, since the
<code>handler</code> attribute is a URI, the handler element may be in
another document).</p>

<p>If the <code>observer</code> attribute is also omitted, then
the parent of the handler element is the observer element.</p>








<h3 id="sec_3.3.1." >3.3.1. Examples of Using Attributes Attached to a Handler Element
</h3>






<ol>
  <li><p>In this case the element is the handler for the <code>submit</code>
    event on the element with <code>id="form1"</code>.</p>
    <pre>&lt;script type="application/x-javascript"
        ev:event="submit" ev:observer="form1"&gt;
   return docheck(event);
&lt;/script&gt;</pre>
  </li>
  <li><p>In this case the <code>action</code> element is the handler
    for event <code>q-submit</code>, and the observer is the
    <code>questionnaire</code> element.</p>
    <pre>&lt;questionnaire submissionURL="/q/tally"&gt;
    &lt;action ev:event="q-submit"&gt;
      ...
    &lt;/action&gt;
    ...
 &lt;/questionnaire&gt;</pre>
  </li>
  <li><p>The <code>script</code> element is the handler for event
    <code>click</code>; the <code>img</code> element is the
    observer.</p>
    <pre>&lt;img src="button.gif" alt="OK"&gt;
    &lt;script ev:event="DOMActivate" type="application/x-javascript"&gt;
        doactivate(event);
    &lt;/script&gt;
&lt;/img&gt;</pre>
  </li>
  <li><p>The <code>onevent</code> element is the handler for event
    <code>enterforward</code>. The <code>card</code> element is the
    observer.</p>
    <pre>&lt;card&gt;
    &lt;onevent ev:event="enterforward"&gt;
        &lt;go href="/url"/&gt;
    &lt;/onevent&gt;
    &lt;p&gt;
      Hello!
    &lt;/p&gt;
&lt;/card&gt;</pre>
  </li>
  <li><p>The <code>catch</code> element is the handler for the
    <code>nomatch</code> event. The observer is the <code>field</code>
    element.</p>
    <pre>&lt;form id="launch_missiles"&gt;
  &lt;field name="password"&gt;
    &lt;prompt&gt;What is the code word?&lt;/prompt&gt;
    &lt;grammar&gt;
      &lt;rule id="root" scope="public"&gt;rutabaga&lt;/rule&gt;
    &lt;/grammar&gt;
    &lt;help&gt;It is the name of an obscure vegetable.&lt;/help&gt;
    &lt;catch ev:event="nomatch"&gt;
      &lt;prompt&gt;Security violation!&lt;/prompt&gt;
      &lt;submit next="apprehend_felon" namelist="user_id"/&gt;
    &lt;/catch&gt;
  &lt;/field&gt;
  &lt;block&gt;
    &lt;goto next="#get_city"/&gt;
  &lt;/block&gt;
&lt;/form&gt;</pre>
  </li>
  <li><p>This example shows three handlers for different events. The observer
    for all three is the <code>secret</code> element.</p>
    <pre>&lt;secret ref="/login/password"&gt;
    &lt;caption&gt;Please enter your password&lt;/caption&gt;
    &lt;info ev:event="help"&gt;
        Mail help@example.com in case of problems
    &lt;/info&gt;
    &lt;info ev:event="hint"&gt;
        A pet's name
    &lt;/info&gt;
    &lt;info ev:event="alert"&gt;
        This field is required
    &lt;/info&gt;
&lt;/secret&gt;</pre>
  </li>
</ol>








<h2 id="section-attributedefaulting" >3.4. Summary of Observer and Handler Attribute Defaulting
</h2>






<p>The following table summarizes which elements play the role of
observer or handler if the relevant attribute is omitted.</p>

<table cellpadding="3" border="1" summary="The effect of omitted observer and handler attributes">
  <caption>The effect of omitted observer and handler attributes</caption>
  <tbody>
    <tr>
      <td></td>
      <th>Handler present</th>
      <th>Handler omitted</th>
    </tr>
    <tr>
      <th>Observer present</th>
      <td>(As declared)</td>
      <td>Element is handler</td>
    </tr>
    <tr>
      <th>Observer omitted</th>
      <td>Element is observer</td>
      <td>Element is handler<br />
        Parent is observer</td>
    </tr>
  </tbody>
</table>








<h2 id="sec_3.5." >3.5. Event Scope
</h2>





<p>In some environments (e.g., User Agents) it is possible to have multiple documents available simultaneously - even to 
the extent that one document is <em>embedded</em> within another (see the <code>iframe</code> element in [<a class="nref" href="#ref_XHTMLMOD">XHTMLMOD</a>]).
When multiple documents are available, each of these documents is in a separate <em>context</em>.
Consequently, it is not possible for DOM events to move among these separate documents.  This means, for example, that if one document is
embedded within another, an event fired in the context of that document WILL NOT be available to the event handlers in enclosing document.
See [<a class="nref" href="#ref_DOM3EVENTS">DOM3EVENTS</a>] for more information.</p>








<h2 id="sec_3.6." >3.6. Listener Registration
</h2>





<p><span class="must"  >Dynamic content MUST be evaluated by a user agent to ensure that any 
new listeners or handlers are correctly registered with the event system.</span></p>
<p><span class="must"  >An implementation MUST behave as if any event handlers
are registered prior to the DOM3 <code>load</code> event being fired.</span></p>

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<h1 id="s_handler_module_elements" >4. The XML Handlers Module
</h1>



	
	

<p><em>This section is normative.</em></p>

<p>The purpose of this module is to provide a declarative way to map
specific events to a series of one or more actions.  Those actions are
declared either by the Host Language (e.g., [<a class="nref" href="#ref_XFORMS">XFORMS</a>]) or
within the document using the XML Events module above.  Implementing
actual handlers for the events remains the purview of the Host
Language, supported scripting languages, etc.</p>

<p>The XML Handlers Module supports the following elements and attributes:</p>

<table cellpadding="3" class="moduledef" border="1"
summary="Element and Attributes for XML Handlers Module">
  <thead>
    <tr>
      <th>Element</th>
      <th>Attributes</th>
      <th>Minimal Content Model</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td><a href="#section-action-element">action</a></td>
      <td>event (<span class="datatype"><a
        href="http://www.w3.org/TR/xhtml-modularization/abstraction.html#dt_QNames">QNames</a></span>),<br />
          eventTarget (<span class="datatype"><a
        href="http://www.w3.org/TR/xhtml-modularization/abstraction.html#dt_IDREFS">IDREFS</a></span>),<br />
          declare ("declare"),<br />
          if (<a href="#section-conditional-expressions">ConditionalExpression</a>),<br />
          while (<a href="#section-conditional-expressions">ConditionalExpression</a>),<br />
          xml:id ([<a class="nref" href="#ref_XMLID">XMLID</a>])
      </td>
      <td>( action | dispatchEvent | addEventListener | removeEventListener
	  | stopPropagation | preventDefault )+</td>
  </tr>
  <tr>
      <td><a href="#section-dispatchEvent-element">dispatchEvent</a></td>
      <td>eventType&nbsp;(<span class="datatype"><a
        href="http://www.w3.org/TR/xhtml-modularization/abstraction.html#dt_QName">QName</a></span>),<br />
          targetid&nbsp;(<span class="datatype"><a
        href="http://www.w3.org/TR/xhtml-modularization/abstraction.html#dt_IDREFS">IDREFS</a></span>),<br />
          bubbles&nbsp;("bubbles"),<br />
          cancelable&nbsp;("cancelable"),<br />
          xml:id&nbsp;([<a class="nref" href="#ref_XMLID">XMLID</a>])
      </td>
      <td>EMPTY</td>
  </tr>
  <tr>
      <td><a href="#section-addEventListener-element">addEventListener</a></td>
      <td>event* (<span class="datatype"><a
        href="http://www.w3.org/TR/xhtml-modularization/abstraction.html#dt_QName">QName</a></span>),<br />
          handler* (<span class="datatype"><a
        href="http://www.w3.org/TR/xhtml-modularization/abstraction.html#dt_IDREF">IDREF</a></span>),<br />
          phase ("bubble" | "capture" | "default"* | "target"),<br />
          xml:id ([<a class="nref" href="#ref_XMLID">XMLID</a>])
      </td>
      <td>EMPTY</td>
  </tr>
  <tr>
      <td><a href="#section-removeEventListener-element">removeEventListener</a></td>
      <td>event* (<span class="datatype"><a
        href="http://www.w3.org/TR/xhtml-modularization/abstraction.html#dt_QName">QName</a></span>),<br />
          handler* (<span class="datatype"><a
        href="http://www.w3.org/TR/xhtml-modularization/abstraction.html#dt_IDREF">IDREF</a></span>),<br />
          phase ("bubble" | "capture" | "default"* | "target"),<br />
          xml:id ([<a class="nref" href="#ref_XMLID">XMLID</a>])
      </td>
      <td>EMPTY</td>
  </tr>
  <tr>
      <td><a href="#section-stopPropagation-element">stopPropagation</a></td>
      <td>event* (<span class="datatype"><a
        href="http://www.w3.org/TR/xhtml-modularization/abstraction.html#dt_QName">QName</a></span>),<br />
          xml:id ([<a class="nref" href="#ref_XMLID">XMLID</a>])
      </td>
      <td>EMPTY</td>
  </tr>
  <tr>
      <td><a href="#section-preventDefault-element">preventDefault</a></td>
      <td>event* (<span class="datatype"><a
        href="http://www.w3.org/TR/xhtml-modularization/abstraction.html#dt_QName">QName</a></span>),<br />
          xml:id ([<a class="nref" href="#ref_XMLID">XMLID</a>])
      </td>
      <td>EMPTY</td>
  </tr>

  </tbody>
</table>

<p><span class="must"  >When this module is selected, the XML Events module MUST also be selected.</span></p>

<p>Implementations: <a href="#a_module_xml_handlers">DTD</a>,
<a href="#a_schema_xml_handlers">XML Schema</a></p>








<h2 id="section-action-element" >4.1. The action Element
</h2>






<p>The <code>action</code> element is used to group event 
handler elements (including other <code>action</code> elements)
that will act <em>in sequence</em>
as handlers for an event.  The
<code>action</code> element takes the following attributes:</p>
<dl>
  <dt><a id="attr-action-event">event</a></dt>
    <dd>The required <code>event</code> attribute specifies one, or more, event types 
    this action will handle.</dd>
  <dt><a id="attr-action-eventTarget">eventTarget</a></dt>

    <dd>The optional <code>eventTarget</code> attribute specifies the
      <code>id</code> of one, or more, target elements of the event (i.e., the node that
      caused the event). If this attribute is present, only events that match
      both the <code>event</code> and <code>eventTarget</code> attributes will be
      processed. Clearly because of the way
      events propagate, the target element should be a descendant node of 
      the observer element, or the observer element itself.
    </dd>
    <dt><a id="attr-action-declare">declare</a></dt>
    <dd>When present, this boolean attribute makes the current 
    element (and any elements it may contain) a declaration only.</dd>

	<dt><a id="attr-listener-if">if</a></dt>
	<dd>
          The optional if attribute allows a condition to be specified.  
          This condition must be met in order for the event handler to be activated. 
          The condition is specified using a <a href="#section-conditional-expressions">Conditional Expression</a>. 
          There is no default value.
          
          <p>This attribute allows event handlers to be specified that respond not just to named events, 
          but to more specific conditions, such as a mouse click with the control key pressed:</p>
          




<div class="example">
<pre>
&lt;action event="click" if="event('ctrlKey') = true()"&gt;
 . . .
&lt;/action&gt;
</pre>
</div>

	  <p>The event function is described in <a href="#event-function">Event Function</a>.</p>
	</dd>

	<dt><a id="attr-listener-while">while</a></dt>
	<dd>
	  The optional while attribute allows a condition to be
	  specified. This condition must be met in order for the event
	  handler to be activated. The condition is specified using an
	  <a href="#section-conditional-expressions">Conditional Expression</a>. There is no default value.
	  
	  <p>This attribute allows event handlers to be specified that
	  perform their action whilst some condition remains true.</p>
	  
	  <p><em>EDITORS' NOTE:</em> Can't think of an example that only makes use of what we 
	  have in this spec, i.e., the event() function. We may need to do something like delete a list in XForms.</p>
	</dd>

</dl>









<h2 id="section-dispatchEvent-element" >4.2. The dispatchEvent Element
</h2>






<p>The <code>dispatchEvent</code> element triggers the event
identified by the <code>eventType</code> attribute, delivering
it to the element identified by the <code>to</code> attribute.</p>

<p>The <code>dispatchEvent</code> element also defines two additional
attributes:</p>
<dl>
<dt><a id="attr-dispatchEvent-bubbles">bubbles</a></dt>
<dd>
  Optional boolean indicating if this event bubbles as defined
  in [<a class="nref" href="#ref_DOM3EVENTS">DOM3EVENTS</a>]. The default value will depend on the
  actual event being dispatched.</dd>

<dt><a id="attr-dispatchEvent-cancelable">cancelable</a></dt>
<dd>
  Optional boolean indicating if this event is cancelable as
  defined in [<a class="nref" href="#ref_DOM3EVENTS">DOM3EVENTS</a>]. The default value will depend on
  the actual event being dispatched.</dd>

  <dt><a id="attr-dispatchEvent-targetid">targetid</a></dt>
  <dd>This attribute specifies the <code>id</code> of one or more elements to which the event is dispatched. If this is not specified,
  it defaults to the parent of the <code>dispatchEvent</code> element</dd>

  <dt><a id="attr-dispatchEvent-eventType">eventType</a></dt>
  <dd>The <span class="datatype"><a
        href="http://www.w3.org/TR/xhtml-modularization/abstraction.html#dt_QName">QName</a></span> of the event to be triggered.</dd>
</dl>








<h2 id="section-addEventListener-element" >4.3. The addEventListener element
</h2>






<p>This element allows the registration of a listener on a specific
event, as defined in [<a class="nref" href="#ref_DOM3EVENTS">DOM3EVENTS</a>]. </p>








<h2 id="section-removeEventListener-element" >4.4. The removeEventListener element
</h2>






<p>The <code>removeEventListener</code> element de-registers the 
handler identified by the required <code>handler</code> attribute for
the event identified by the required <code>event</code> attribute.</p>








<h2 id="section-stopPropagation-element" >4.5. The stopPropagation element
</h2>






<p>The <code>stopPropagation</code>
element is used to prevent further propagation of an
event during event flow. If this is called by any EventListener the
event will cease propagating through the tree. The event will complete
dispatch to all listeners on the current EventTarget before event flow
stops. This action may be used during any stage of event flow.</p>








<h2 id="section-preventDefault-element" >4.6. The preventDefault element
</h2>






<p>If an event is cancelable, the <code>preventDefault</code>
action is used to signify that
the event is to be canceled, meaning any default action normally taken by
the implementation as a result of the event will not occur. If, during any
stage of event flow, the <code>preventDefault</code>
action is called the event is
canceled. Any default action associated with the event will not occur.
Calling this action for a non-cancelable event has no effect. Once
preventDefault has been called it will remain in effect throughout the
remainder of the event's propagation. This action may be used during any
stage of event flow.</p>

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<h1 id="s_script_module" >5. The XML Scripting Module
</h1>



	
	

<p><em>This section is normative.</em></p>

<p>The XML Script Module defines an element for defining event handlers
via a scripting language.  
This module can be used as a
replacement for the XHTML Scripting Module
defined in XHTML Modularization [<a class="nref" href="#ref_XHTMLMOD">XHTMLMOD</a>].</p>

<p>The XML Script Module supports the following element:</p>

<table cellpadding="3" class="moduledef" border="1" summary="Element for XML Script Module">
  <thead>
    <tr>
      <th>Element</th>
      <th>Attributes</th>
      <th>Minimal Content Model</th>
    </tr>
  </thead>
  <tbody>
      <tr>
          <td><a href="#section-script-element">script</a></td>
          <td>charset (<span class="datatype"><a
        href="http://www.w3.org/TR/xhtml-modularization/abstraction.html#dt_Charset">Charset</a></span>),<br />
              defer ("defer"), <br />
              implements (<code>URIorSafeCURIEs</code>),<br />
              src (<span class="datatype"><a
        href="http://www.w3.org/TR/xhtml-modularization/abstraction.html#dt_URI">URI</a></span>),<br />
              type (<span class="datatype"><a
        href="http://www.w3.org/TR/xhtml-modularization/abstraction.html#dt_ContentType">ContentType</a></span>),<br />
              xml:id ([<a class="nref" href="#ref_XMLID">XMLID</a>])
          </td>
          <td>PCDATA</td>
      </tr>
  </tbody>
</table>

<p>When the Scripting module is included AND the XML Handlers Module
is included, the <code>script</code> element is added to the content
model of the XML Handlers Module <code>action</code> element.</p>

<p>Implementations: <a href="#a_module_xml_script">DTD</a>,
<a href="#a_schema_xml_script">XML Schema</a></p>








<h2 id="section-script-element" >5.1. The script Element
</h2>






<p>The <code>script</code> element contains or references <em>scripts</em> that may register one or more event handlers for a document through a <em>scripting language</em> that is supported by the implementation.</p>

<dl>
  <dt id="attr-script-charset">charset</dt>
  <dd>The optional <code>charset</code> attribute specifies the encoding
  of the remote resource identified by the <code>src</code> attribute.
  </dd>
  <dt id="attr-script-defer">defer</dt>
  <dd>This attribute provides a hint to the user agent that the contents 
  of the <code>script</code> element will not effect the generation of the document.</dd>
  <dt><a id="attr-script-implements">implements</a></dt>
    <dd>The optional <code>implements</code> attribute indicates that the script provides an implementation of the feature or features identified via this attribute. 
    <span class="should"  >The script SHOULD only be loaded and used if the user agent does not have an implementation of the specified feature.</span>
    </dd>
  <dt id="attr-script-src">src</dt>
  <dd>The <code>src</code> attribute identifies an external resource 
  that provides the script implementation.</dd>
  <dt id="attr-script-type">type</dt>
  <dd>Defines the programming language in which the script is 
  implemented by using its media type.</dd>
  <dt id="attr-script-xml-id">xml:id</dt>
  <dd>The optional xml:id attribute assigns an identifier to an element. The value of this attribute must be unique within a document.</dd>
</dl>

<p>The event handler(s) may be defined within the contents of the
<code>script</code> element or in an external file. <span class="must"  >If the <code>src</code> 
attribute is not set, user agents MUST
interpret the contents of the element as the handler.</span> 
<span class="must"  >If the <code>src</code> has a URI value, user agents MUST ignore
the element's contents and retrieve the handler via the URI.</span>
</p>

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<h1 id="section-event-naming" >6. Naming Event Types
</h1>



	
	


<p><em>This section is informative.</em></p>

<p>This specification does not normatively specify how language designers
should name events (i.e., the values used in the <code>event</code>
attribute).</p>

<p>However, future versions of DOM Events are likely to allow namespaced event names, so language designers are advised not to use the colon character ":" in event names.</p>

<p>A number of event types are defined in DOM 3 Events [<a class="nref" href="#ref_DOM3EVENTS">DOM3EVENTS</a>], to
which you should refer for their names and semantics.</p>

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<h1 id="section-conditional-expressions" >7. Conditional Expressions
</h1>



	
	


<p>XML Events uses XPath-like expressions to specify conditionals 
(<a href="#attr-listener-if">if</a>, <a href="#attr-listener-while">while</a>).
As described in section 1 of [<a class="nref" href="#ref_XPATH">XPATH</a>], each expression is evaluated
within a context, which is made up of:
</p>
<ul>
    <li>a node (the context node)</li>
    <li>a pair of non-zero positive integers (the context position and the context size)</li>
    <li>a set of variable bindings</li>
    <li>a function library</li>
    <li>the set of namespace declarations in scope for the expression</li>
</ul>

<p>By default, XML Events expressions have no context node, and so the context
position is 0 and the context size is 0. There are no variable bindings, and
the function library contains the functions described below. It is
not necessary to provide namespace declarations.</p>

<p><span class="must"  >Host languages that import XML Events may provide a richer context, and
MUST specify whether their context is the same as that provided here, or
more.</span></p>









<h2 id="conditional-function-library" >7.1. Function Library
</h2>





<p>The function library consists of the following functions:</p>
<ul>
    <li>event</li>
</ul>








<h3 id="event-function" >7.1.1. Event Function
</h3>





<p><code>object event(string)</code></p>

<p>Function <code>event</code> returns the value of a property of the current event object,
as determined by the string argument. The value returned will be typed,
depending on the property. For example, the MouseEvent interface [<a class="nref" href="#ref_DOM3EVENTS">DOM3EVENTS</a>]
has the
attribute <code>shiftKey</code>, which is a <code>boolean</code>. This can be accessed by passing the
string value '<code>shiftKey</code>' to the event function. The result will be an XPath-like
boolean.</p>


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<h1 id="a_DTD_definition" >A. DTD Implementation
</h1>



	
	


<p>This appendix is <em>normative</em>.</p>

<p>The DTD implementation of XML Events conforms to the requirements defined
in [<a class="nref" href="#ref_XHTMLMOD">XHTMLMOD</a>]. Consequently, it provides a Qualified
Names sub-module, and a module file for the XML Events
module defined in this Proposed Recommendation.</p>








<h2 id="a_module_qname" >A.1. Qualified Names Module
</h2>






<p>Note that this module defines the parameter entity
<code>%xml-events-attrs.qname;</code>. This entity is intended to be used in
the attribute lists of elements in any Host Language that permits the use of
event attributes on elements in its own namespace. In this case the Host
Language driver should set a parameter entity <code>%XML-EVENTS.prefixed;</code>
to <code>INCLUDE</code> and a parameter entity <code>%XML-EVENTS.prefix;</code>
to a value that is the prefix for the XML Events attributes.</p>








<pre class="dtd">
&lt;!-- ....................................................................... --&gt;
&lt;!-- XML Events Qname Module  ............................................ --&gt;
&lt;!-- file: xml-events-qname-2.mod

     This is XML Events - the Events Module for XML,
     a definition of access to the DOM events model.

     Copyright 2000-2007 W3C (MIT, ERCIM, Keio), All Rights Reserved.

     This DTD module is identified by the PUBLIC and SYSTEM identifiers:

       PUBLIC "-//W3C//ENTITIES XML Events Qnames 2.0//EN"
       SYSTEM "http://www.w3.org/MarkUp/DTD/xml-events-qname-2.mod"

     Revisions:
     (none)
     ....................................................................... --&gt;

&lt;!-- XML Events Qname (Qualified Name) Module

     This module is contained in two parts, labeled Section 'A' and 'B':

       Section A declares parameter entities to support namespace-
       qualified names, namespace declarations, and name prefixing
       for XML Events and extensions.

       Section B declares parameter entities used to provide
       namespace-qualified names for all XML Events element types:

         %listener.qname;   the xmlns-qualified name for &lt;listener&gt;
         ...

     XML Events extensions would create a module similar to this one.
     Included in the XML distribution is a template module
     ('template-qname-2.mod') suitable for this purpose.
--&gt;

&lt;!-- Section A: XML Events XML Namespace Framework :::::::::::::::::::: --&gt;

&lt;!-- 1. Declare a %XML-EVENTS.prefixed; conditional section keyword, used
        to activate namespace prefixing. The default value should
        inherit '%NS.prefixed;' from the DTD driver, so that unless
        overridden, the default behavior follows the overall DTD
        prefixing scheme.
--&gt;
&lt;!ENTITY <span class="entity">% NS.prefixed</span> "IGNORE" &gt;
&lt;!ENTITY <span class="entity">% XML-EVENTS.prefixed</span> "%NS.prefixed;" &gt;

&lt;!-- 2. Declare a parameter entity (eg., %XML-EVENTS.xmlns;) containing
        the URI reference used to identify the XML Events namespace
--&gt;
&lt;!ENTITY <span class="entity">% XML-EVENTS.xmlns</span>  "http://www.w3.org/2001/xml-events" &gt;

&lt;!-- 3. Declare parameter entities (eg., %XML.prefix;) containing
        the default namespace prefix string(s) to use when prefixing
        is enabled. This may be overridden in the DTD driver or the
        internal subset of an document instance. If no default prefix
        is desired, this may be declared as an empty string.

     NOTE: As specified in [XMLNAMES], the namespace prefix serves
     as a proxy for the URI reference, and is not in itself significant.
--&gt;
&lt;!ENTITY <span class="entity">% XML-EVENTS.prefix</span>  "" &gt;

&lt;!-- 4. Declare parameter entities (eg., %XML-EVENTS.pfx;) containing the
        colonized prefix(es) (eg., '%XML-EVENTS.prefix;:') used when
        prefixing is active, an empty string when it is not.
--&gt;
&lt;![%XML-EVENTS.prefixed;[
&lt;!ENTITY <span class="entity">% XML-EVENTS.pfx</span>  "%XML-EVENTS.prefix;:" &gt;
]]&gt;
&lt;!ENTITY <span class="entity">% XML-EVENTS.pfx</span>  "" &gt;

&lt;!-- declare qualified name extensions here ............ --&gt;
&lt;!ENTITY <span class="entity">% xml-events-qname-extra.mod</span> "" &gt;
%xml-events-qname-extra.mod;

&lt;!-- 5. The parameter entity %XML-EVENTS.xmlns.extra.attrib; may be
        redeclared to contain any non-XML Events namespace declaration
        attributes for namespaces embedded in XML. The default
        is an empty string.  XLink should be included here if used
        in the DTD.
--&gt;
&lt;!ENTITY <span class="entity">% XML-EVENTS.xmlns.extra.attrib</span> "" &gt;


&lt;!-- Section B: XML Qualified Names ::::::::::::::::::::::::::::: --&gt;

&lt;!-- 6. This section declares parameter entities used to provide
        namespace-qualified names for all XML Events element types.
--&gt;

&lt;!ENTITY <span class="entity">% xml-events.listener.qname</span>  "%XML-EVENTS.pfx;listener" &gt;


&lt;!ENTITY <span class="entity">% xml-handlers.action.qname</span>  "%XML-EVENTS.pfx;action" &gt;
&lt;!ENTITY <span class="entity">% xml-script.script.qname</span>  "%XML-EVENTS.pfx;script" &gt;
&lt;!ENTITY <span class="entity">% xml-handlers.dispatchEvent.qname</span>  "%XML-EVENTS.pfx;dispatchEvent" &gt;
&lt;!ENTITY <span class="entity">% xml-handlers.addEventListener.qname</span>  "%XML-EVENTS.pfx;addEventListener" &gt;
&lt;!ENTITY <span class="entity">% xml-handlers.removeEventListener.qname</span>  "%XML-EVENTS.pfx;removeEventListener" &gt;
&lt;!ENTITY <span class="entity">% xml-handlers.stopPropagation.qname</span>  "%XML-EVENTS.pfx;stopPropagation" &gt;
&lt;!ENTITY <span class="entity">% xml-handlers.preventDefault.qname</span>  "%XML-EVENTS.pfx;preventDefault" &gt;


&lt;!-- The following defines a PE for use in the attribute sets of elements in
     other namespaces that want to incorporate the XML Event attributes. Note
     that in this case the XML-EVENTS.pfx should always be defined. --&gt;

&lt;!ENTITY <span class="entity">% xml-events.attrs.qname</span>
   "%XML-EVENTS.pfx;event            NMTOKEN      #IMPLIED
    %XML-EVENTS.pfx;observer         IDREFS       #IMPLIED
    %XML-EVENTS.pfx;eventTarget      IDREFS       #IMPLIED
    %XML-EVENTS.pfx;handler          %URI.datatype;        #IMPLIED
    %XML-EVENTS.pfx;phase            (capture|default) #IMPLIED
    %XML-EVENTS.pfx;propagate        (stop|continue) #IMPLIED
    %XML-EVENTS.pfx;defaultAction    (cancel|perform) #IMPLIED
    %XML-EVENTS.pfx;condition        CDATA        #IMPLIED"
    &gt;

&lt;!-- end of xml-events-qname-2.mod --&gt;

</pre>








<h2 id="a_module_xml_events" >A.2. XML Events Module
</h2>













<pre class="dtd">
&lt;!-- ...................................................................... --&gt;
&lt;!-- XML Events Module .................................................... --&gt;
&lt;!-- file: xml-events-2.mod

     This is XML Events - the Events Module for XML.
     a redefinition of access to the DOM events model.

     Copyright 2000-2007 W3C (MIT, ERCIM, Keio), All Rights Reserved.

     This DTD module is identified by the PUBLIC and SYSTEM identifiers:

       PUBLIC "-//W3C//ENTITIES XML Events 2.0//EN"
       SYSTEM "http://www.w3.org/MarkUp/DTD/xml-events-2.mod"

     Revisions:
     (none)
     ....................................................................... --&gt;


&lt;!-- XML Events defines the listener element and its attributes --&gt;

&lt;!ENTITY <span class="entity">% xml-events.listener.content</span> "EMPTY" &gt;

&lt;!ELEMENT <span class="element">%xml-events.listener.qname;</span> %xml-events.listener.content;&gt;
&lt;!ATTLIST %xml-events.listener.qname;
    xml:id           ID           #IMPLIED
    event            NMTOKEN      #REQUIRED
    observer         IDREF        #IMPLIED
    eventTarget      IDREF        #IMPLIED
    handler          %anyURI.datatype;        #IMPLIED
    phase            (capture|default) #IMPLIED
    propagate        (stop|continue) #IMPLIED
    defaultAction    (cancel|perform)  #IMPLIED
&gt;

&lt;!-- end of xml-events-2.mod --&gt;

</pre>







<h2 id="a_module_xml_handlers" >A.3. XML Handlers Module
</h2>













<pre class="dtd">
&lt;!-- ................................................................... --&gt;
&lt;!-- XML Handlers Module ............................................... --&gt;
&lt;!-- file: xml-handlers-1.mod

     This is XML Handlers - the Handlers Module for XML.
     a redefinition of support for handlers of the DOM event model.

     Copyright 2007-2008 W3C (MIT, ERCIM, Keio), All Rights Reserved.

     This DTD module is identified by the PUBLIC and SYSTEM identifiers:

       PUBLIC "-//W3C//ENTITIES XML Handlers 1.0//EN"
       SYSTEM "http://www.w3.org/MarkUp/DTD/xml-handlers-1.mod"

     Revisions:
     (none)
     ....................................................................... --&gt;


&lt;!-- XML Handlers defines the various element and attributes --&gt;

&lt;!ENTITY <span class="entity">% xml-handlers.action.content</span> 
    "( %xml-handlers.action.qname; |
       %xml-handlers.dispatchevent.qname; |
       %xml-handlers.addEventListener.qname; |
       %xml-handlers.removeEventListener.qname; |
       %xml-handlers.stopPropagation.qname; |
       %xml-handlers.preventDefault.qname; |
       %xml-handlers.action.extras; )+ "
&gt;

&lt;!ELEMENT <span class="element">%xml-handlers.action.qname;</span> %xml-handlers.action.content;&gt;
&lt;!ATTLIST %xml-handlers.action.qname;
    xml:id           ID                   #IMPLIED
    event            %QName.datatype;     #IMPLIED
    eventTarget      IDREF                #IMPLIED
    declare          ( declare )          #IMPLIED
    if               CDATA                #IMPLIED
    while            CDATA                #IMPLIED
&gt;

&lt;!ENTITY <span class="entity">% xml-handlers.dispatchEvent.content</span> "NONE" &gt;
&lt;!ELEMENT <span class="element">%xml-handlers.dispatchEvent.qname;</span> 
          %xml-handlers.dispatchEvent.content &gt;

&lt;ENTITY % xml-handlers.dispatchEvent.attlist "INCLUDE" &gt;
&lt;![%xml-handlers.dispatchEvent.attlist;[
&lt;!ATTLIST %xml-handlers.dispatchEvent.qname;
      %XML-EVENTS.xmlns.attrib;
      xml:id       ID                       #IMPLIED
      targetid     IDREFS                   #IMPLIED
      eventType    %QName.datatype;         #IMPLIED
      bubbles      ( bubbles )              #IMPLIED
      cancelable   ( cancelable )           #IMPLIED
&gt;
&lt;!-- end of xml-handlers.dispatchEvent.attlist --&gt;]]&gt;

&lt;!ENTITY <span class="entity">% xml-handlers.addEventListener.content</span> "NONE" &gt;
&lt;!ELEMENT <span class="element">%xml-handlers.addEventListener.qname;</span> 
          %xml-handlers.addEventListener.content &gt;

&lt;ENTITY % xml-handlers.addEventListener.attlist "INCLUDE" &gt;
&lt;![%xml-handlers.addEventListener.attlist;[
&lt;!ATTLIST %xml-handlers.addEventListener.qname;
      %XML-EVENTS.xmlns.attrib;
      xml:id       ID                       #IMPLIED
      event        %QName.datatype;         #REQUIRED
      handler      IDREF                    #REQUIRED
      phase        (capture|default)        #IMPLIED
&gt;
&lt;!-- end of xml-handlers.addEventListener.attlist --&gt;]]&gt;

&lt;!ENTITY <span class="entity">% xml-handlers.removeEventListener.content</span> "NONE" &gt;
&lt;!ELEMENT <span class="element">%xml-handlers.removeEventListener.qname;</span> 
          %xml-handlers.removeEventListener.content &gt;

&lt;ENTITY % xml-handlers.removeEventListener.attlist "INCLUDE" &gt;
&lt;![%xml-handlers.removeEventListener.attlist;[
&lt;!ATTLIST %xml-handlers.removeEventListener.qname;
      %XML-EVENTS.xmlns.attrib;
      xml:id       ID                       #IMPLIED
      event        %QName.datatype;         #REQUIRED
      handler      IDREF                    #REQUIRED
      phase        (capture|default)        #IMPLIED
&gt;
&lt;!-- end of xml-handlers.addEventListener.attlist --&gt;]]&gt;

&lt;!ENTITY <span class="entity">% xml-handlers.stopPropagation.content</span> "NONE" &gt;
&lt;!ELEMENT <span class="element">%xml-handlers.stopPropagation.qname;</span> 
          %xml-handlers.stopPropagation.content &gt;

&lt;ENTITY % xml-handlers.stopPropagation.attlist "INCLUDE" &gt;
&lt;![%xml-handlers.stopPropagation.attlist;[
&lt;!ATTLIST %xml-handlers.stopPropagation.qname;
      %XML-EVENTS.xmlns.attrib;
      xml:id       ID                       #IMPLIED
      event        %QName.datatype;         #REQUIRED
&gt;
&lt;!-- end of xml-handlers.stopPropagation.attlist --&gt;]]&gt;

&lt;!ENTITY <span class="entity">% xml-handlers.preventDefault.content</span> "NONE" &gt;
&lt;!ELEMENT <span class="element">%xml-handlers.preventDefault.qname;</span> 
          %xml-handlers.preventDefault.content &gt;

&lt;ENTITY % xml-handlers.preventDefault.attlist "INCLUDE" &gt;
&lt;![%xml-handlers.preventDefault.attlist;[
&lt;!ATTLIST %xml-handlers.preventDefault.qname;
      %XML-EVENTS.xmlns.attrib;
      xml:id       ID                       #IMPLIED
      event        %QName.datatype;         #REQUIRED
&gt;
&lt;!-- end of xml-handlers.preventDefault.attlist --&gt;]]&gt;

&lt;!-- end of xml-handlers-1.mod --&gt;

</pre>







<h2 id="a_module_xml_script" >A.4. XML Scripting Module
</h2>













<pre class="dtd">
&lt;!-- ................................................................... --&gt;
&lt;!-- XML Scripting Module .............................................. --&gt;
&lt;!-- file: xml-script-1.mod

     This is XML Scripting - the Scripting Module for XML.

     Copyright 2008 W3C (MIT, ERCIM, Keio), All Rights Reserved.

     This DTD module is identified by the PUBLIC and SYSTEM identifiers:

       PUBLIC "-//W3C//ENTITIES XML Scripting 1.0//EN"
       SYSTEM "http://www.w3.org/MarkUp/DTD/xml-script-1.mod"

     Revisions:
     (none)
     ....................................................................... --&gt;


&lt;!-- XML Scripting defines the following element --&gt;

&lt;!ENTITY <span class="entity">% xml-script.script.content</span> "( #PCDATA )" &gt;
&lt;!ELEMENT <span class="element">%xml-script.script.qname;</span> %xml-handlers.script.content; &gt;
&lt;!ENTITY <span class="entity">% xml-script.script.attlist</span>  "INCLUDE" &gt;
&lt;![%xml-script.script.attlist;[
&lt;!ATTLIST %xml-script.script.qname;
      %XML-EVENTS.xmlns.attrib;
      xml:id       ID                       #IMPLIED
      encoding     %Charset.datatype;       #IMPLIED
      type         %ContentType.datatype;   #REQUIRED
      src          %URI.datatype;           #IMPLIED
      implements   %URIorSafeCURIEs.datatype;  #IMPLIED
&gt;
&lt;!-- end of xml-script.script.attlist --&gt;]]&gt;

&lt;!-- end of xml-script-1.mod --&gt;

</pre>

<!--OddPage-->



      
      
    




<h1 id="a_Schema_definition" >B. Schema Implementation
</h1>



	
	


<p>This appendix is <em>normative</em>.</p>
<p>The schema implementation of XML Events conforms to the requirements defined
in [<a class="nref" href="#ref_XHTMLMOD">XHTMLMOD</a>]. It is divided
into an attributes module and an element module for the XML Events
module defined in this Proposed Recommendation.</p>








<h2 id="a_schema_attribs" >B.1. Attributes Module
</h2>






<!-- INCLUDING SCHEMA SCHEMA/xml-events-attribs-2.xsd.mhtml -->







<pre class="dtd">
&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;xs:schema 
    targetNamespace="http://www.w3.org/2001/xml-events" 
    xmlns:ev="http://www.w3.org/2001/xml-events" 
    xmlns:xs="http://www.w3.org/2001/XMLSchema" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://www.w3.org/2001/XMLSchema 
                        http://www.w3.org/2001/XMLSchema.xsd" 
    elementFormDefault="unqualified" 
    blockDefault="#all" 
    finalDefault="#all" 
    attributeFormDefault="unqualified"&gt;

  &lt;xs:annotation&gt;
    &lt;xs:documentation&gt;
      This is the XML Schema for XML Events global attributes

      URI: http://www.w3.org/MarkUp/SCHEMA/xml-events-attribs-2.xsd
      $Id: Overview.html,v 1.2 2010/12/17 20:25:20 plehegar Exp $
    &lt;/xs:documentation&gt;
    &lt;xs:documentation source="xml-events-copyright-2.xsd"/&gt;
  &lt;/xs:annotation&gt;

  &lt;xs:annotation&gt;
    &lt;xs:documentation&gt;
      XML Event Attributes
		
        These "global" event attributes are defined in "Attaching
        Attributes Directly to the Observer Element" of the XML
        Events specification.
    &lt;/xs:documentation&gt;
  &lt;/xs:annotation&gt;

  &lt;xs:attribute name="event" type="xs:NMTOKEN"/&gt;
  &lt;xs:attribute name="observer" type="xs:IDREF"/&gt;
  &lt;xs:attribute name="eventTarget" type="xs:IDREF"/&gt;
  &lt;xs:attribute name="handler" type="xs:anyURI"/&gt;
  &lt;xs:attribute name="phase" default="default"&gt;
    &lt;xs:simpleType&gt;
      &lt;xs:restriction base="xs:NMTOKEN"&gt;
        &lt;xs:enumeration value="bubble"/&gt;
        &lt;xs:enumeration value="capture"/&gt;
        &lt;xs:enumeration value="default"/&gt;
        &lt;xs:enumeration value="target"/&gt;
      &lt;/xs:restriction&gt;
    &lt;/xs:simpleType&gt;
  &lt;/xs:attribute&gt;
  &lt;xs:attribute name="propagate" default="continue"&gt;
    &lt;xs:simpleType&gt;
      &lt;xs:restriction base="xs:NMTOKEN"&gt;
        &lt;xs:enumeration value="stop"/&gt;
        &lt;xs:enumeration value="continue"/&gt;
      &lt;/xs:restriction&gt;
    &lt;/xs:simpleType&gt;
  &lt;/xs:attribute&gt;
  &lt;xs:attribute name="defaultAction" default="perform"&gt;
    &lt;xs:simpleType&gt;
      &lt;xs:restriction base="xs:NMTOKEN"&gt;
        &lt;xs:enumeration value="cancel"/&gt;
        &lt;xs:enumeration value="perform"/&gt;
      &lt;/xs:restriction&gt;
    &lt;/xs:simpleType&gt;
  &lt;/xs:attribute&gt;

  &lt;xs:attributeGroup name="XmlEvents.attlist"&gt;
    &lt;xs:attribute ref="ev:event"/&gt;
    &lt;xs:attribute ref="ev:observer"/&gt;
    &lt;xs:attribute ref="ev:eventTarget"/&gt;
    &lt;xs:attribute ref="ev:handler"/&gt;
    &lt;xs:attribute ref="ev:phase"/&gt;
    &lt;xs:attribute ref="ev:propagate"/&gt;
    &lt;xs:attribute ref="ev:defaultAction"/&gt;
  &lt;/xs:attributeGroup&gt;

&lt;/xs:schema&gt;

</pre>
<!-- END OF FILE SCHEMA/xml-events-attribs-2.xsd.mhtml -->









<h2 id="a_schema_xml_events" >B.2. XML Events Module
</h2>






<!-- INCLUDING SCHEMA SCHEMA/xml-events-2.xsd.mhtml -->







<pre class="dtd">
&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;xs:schema 
    targetNamespace="http://www.w3.org/2001/xml-events" 
    xmlns="http://www.w3.org/2001/xml-events" 
    xmlns:xs="http://www.w3.org/2001/XMLSchema" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://www.w3.org/2001/XMLSchema 
                        http://www.w3.org/2001/XMLSchema.xsd" 
    elementFormDefault="unqualified" 
    blockDefault="#all" 
    finalDefault="#all" 
    attributeFormDefault="unqualified"&gt;

  &lt;xs:annotation&gt;
    &lt;xs:documentation&gt;
      This is the XML Schema for XML Events

      URI: http://www.w3.org/MarkUp/SCHEMA/xml-events-2.xsd
      $Id: Overview.html,v 1.2 2010/12/17 20:25:20 plehegar Exp $
    &lt;/xs:documentation&gt;
    &lt;xs:documentation source="xml-events-copyright-2.xsd"/&gt;
  &lt;/xs:annotation&gt;

  &lt;xs:annotation&gt;
    &lt;xs:documentation&gt;
      XML Events element listener
		
        This module defines the listener element for XML Events.
        This element can be used to define event listeners. This
        module relies upon the XmlEvents.attlist attribute group
        defined in xml-events-attribs-2.xsd.
    &lt;/xs:documentation&gt;
  &lt;/xs:annotation&gt;

  &lt;xs:attributeGroup name="listener.attlist"&gt;
    &lt;xs:attribute name="event" use="required" type="xs:NMTOKEN"/&gt;
    &lt;xs:attribute name="observer" type="xs:IDREF"/&gt;
    &lt;xs:attribute name="eventTarget" type="xs:IDREF"/&gt;
    &lt;xs:attribute name="handler" type="xs:anyURI"/&gt;
    &lt;xs:attribute name="phase" default="default"&gt;
      &lt;xs:simpleType&gt;
        &lt;xs:restriction base="xs:NMTOKEN"&gt;
          &lt;xs:enumeration value="capture"/&gt;
          &lt;xs:enumeration value="default"/&gt;
        &lt;/xs:restriction&gt;
      &lt;/xs:simpleType&gt;
    &lt;/xs:attribute&gt;
    &lt;xs:attribute name="propagate" default="continue"&gt;
      &lt;xs:simpleType&gt;
        &lt;xs:restriction base="xs:NMTOKEN"&gt;
          &lt;xs:enumeration value="stop"/&gt;
          &lt;xs:enumeration value="continue"/&gt;
        &lt;/xs:restriction&gt;
      &lt;/xs:simpleType&gt;
    &lt;/xs:attribute&gt;
    &lt;xs:attribute name="defaultAction" default="perform"&gt;
      &lt;xs:simpleType&gt;
        &lt;xs:restriction base="xs:NMTOKEN"&gt;
          &lt;xs:enumeration value="cancel"/&gt;
          &lt;xs:enumeration value="perform"/&gt;
        &lt;/xs:restriction&gt;
      &lt;/xs:simpleType&gt;
    &lt;/xs:attribute&gt;
    &lt;xs:attribute name="id" type="xs:ID"/&gt;
  &lt;/xs:attributeGroup&gt;

  &lt;xs:complexType name="listener.type"&gt;
    &lt;xs:attributeGroup ref="listener.attlist"/&gt;
  &lt;/xs:complexType&gt;

  &lt;xs:element name="<span class="element" id="a_smodule_element_listener">listener</span>" type="listener.type"/&gt;

&lt;/xs:schema&gt;

</pre>
<!-- END OF FILE SCHEMA/xml-events-2.xsd.mhtml -->









<h2 id="a_schema_xml_handlers" >B.3. XML Handlers Module
</h2>






<!-- INCLUDING SCHEMA SCHEMA/xml-handlers-1.xsd.mhtml -->







<pre class="dtd">
&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;xs:schema 
    targetNamespace="http://www.w3.org/2001/xml-events" 
    xmlns="http://www.w3.org/2001/xml-events" 
    xmlns:xh11d="http://www.w3.org/1999/xhtml/datatypes/"
    xmlns:xs="http://www.w3.org/2001/XMLSchema" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://www.w3.org/2001/XMLSchema 
                        http://www.w3.org/2001/XMLSchema.xsd" 
    elementFormDefault="unqualified" 
    blockDefault="#all" 
    finalDefault="#all" 
    attributeFormDefault="unqualified"&gt;

  &lt;xs:annotation&gt;
    &lt;xs:documentation&gt;
      This is the XML Schema for XML Handlers

      URI: http://www.w3.org/MarkUp/SCHEMA/xml-handlers-1.xsd
      $Id: Overview.html,v 1.2 2010/12/17 20:25:20 plehegar Exp $
    &lt;/xs:documentation&gt;
    &lt;xs:documentation source="xml-events-copyright-2.xsd"/&gt;
  &lt;/xs:annotation&gt;

  &lt;xs:attributeGroup name="action.attlist"&gt;
    &lt;xs:attribute name="event" use="required" type="xs:QName"/&gt;
    &lt;xs:attribute name="eventTarget" type="xs:IDREF"/&gt;
    &lt;xs:attribute name="declare"&gt;
        &lt;xs:simpleType&gt;
            &lt;xs:restriction base="xs:NMTOKEN"&gt;
                &lt;xs:enumeration value="declare"/&gt;
            &lt;/xs:restriction&gt;
        &lt;/xs:simpleType&gt;
    &lt;/xs:attribute&gt;
    &lt;xs:attribute name="if" type="xs:normalizedString"/&gt;
    &lt;xs:attribute name="while" type="xs:normalizedString"/&gt;
    &lt;xs:attribute name="id" type="xs:ID"/&gt;
  &lt;/xs:attributeGroup&gt;

  &lt;xs:complexType name="action.type"&gt;
    &lt;xs:attributeGroup ref="action.attlist"/&gt;
  &lt;/xs:complexType&gt;

  &lt;xs:element name="<span class="element" id="a_smodule_element_action">action</span>" type="action.type"/&gt;

  &lt;xs:attributeGroup name="dispatchEvent.attlist"&gt;
    &lt;xs:attribute name="eventType" type="xs:QName"/&gt;
    &lt;xs:attribute name="targetid"&gt;
        &lt;xs:simpleType&gt;
            &lt;xs:list itemType="xs:IDREF"/&gt;
        &lt;/xs:simpleType&gt;
    &lt;/xs:attribute&gt;
    &lt;xs:attribute name="bubbles"&gt;
        &lt;xs:simpleType&gt;
            &lt;xs:restriction base="xs:NMTOKEN"&gt;
                &lt;xs:enumeration value="bubbles"/&gt;
            &lt;/xs:restriction&gt;
        &lt;/xs:simpleType&gt;
    &lt;/xs:attribute&gt;
    &lt;xs:attribute name="cancelable"&gt;
        &lt;xs:simpleType&gt;
            &lt;xs:restriction base="xs:NMTOKEN"&gt;
                &lt;xs:enumeration value="cancelable"/&gt;
            &lt;/xs:restriction&gt;
        &lt;/xs:simpleType&gt;
    &lt;/xs:attribute&gt;
    &lt;xs:attribute name="id" type="xs:ID"/&gt;
  &lt;/xs:attributeGroup&gt;

  &lt;xs:complexType name="dispatchEvent.type"&gt;
    &lt;xs:attributeGroup ref="dispatchEvent.attlist"/&gt;
  &lt;/xs:complexType&gt;

  &lt;xs:element name="<span class="element" id="a_smodule_element_dispatchEvent">dispatchEvent</span>" type="dispatchEvent.type"/&gt;

  &lt;xs:attributeGroup name="addEventListener.attlist"&gt;
    &lt;xs:attribute name="event" use="required" type="xs:QName"/&gt;
    &lt;xs:attribute name="handler" use="required" type="xs:IDREF"/&gt;
    &lt;xs:attribute name="phase" default="default"&gt;
        &lt;xs:simpleType&gt;
            &lt;xs:restriction base="xs:NMTOKEN"&gt;
                &lt;xs:enumeration value="bubble"/&gt;
                &lt;xs:enumeration value="capture"/&gt;
                &lt;xs:enumeration value="default"/&gt;
                &lt;xs:enumeration value="target"/&gt;
            &lt;/xs:restriction&gt;
        &lt;/xs:simpleType&gt;
    &lt;/xs:attribute&gt;
    &lt;xs:attribute name="id" type="xs:ID"/&gt;
  &lt;/xs:attributeGroup&gt;

  &lt;xs:complexType name="addEventListener.type"&gt;
    &lt;xs:attributeGroup ref="addEventListener.attlist"/&gt;
  &lt;/xs:complexType&gt;

  &lt;xs:element name="<span class="element" id="a_smodule_element_addEventListener">addEventListener</span>" type="addEventListener.type"/&gt;

  &lt;xs:attributeGroup name="removeEventListener.attlist"&gt;
    &lt;xs:attribute name="event" use="required" type="xs:QName"/&gt;
    &lt;xs:attribute name="handler" use="required" type="xs:IDREF"/&gt;
    &lt;xs:attribute name="phase" default="default"&gt;
        &lt;xs:simpleType&gt;
            &lt;xs:restriction base="xs:NMTOKEN"&gt;
                &lt;xs:enumeration value="bubble"/&gt;
                &lt;xs:enumeration value="capture"/&gt;
                &lt;xs:enumeration value="default"/&gt;
                &lt;xs:enumeration value="target"/&gt;
            &lt;/xs:restriction&gt;
        &lt;/xs:simpleType&gt;
    &lt;/xs:attribute&gt;
    &lt;xs:attribute name="id" type="xs:ID"/&gt;
  &lt;/xs:attributeGroup&gt;
  &lt;xs:complexType name="removeEventListener.type"&gt;
    &lt;xs:attributeGroup ref="removeEventListener.attlist"/&gt;
  &lt;/xs:complexType&gt;

  &lt;xs:element name="<span class="element" id="a_smodule_element_removeEventListener">removeEventListener</span>" type="removeEventListener.type"/&gt;

  &lt;xs:attributeGroup name="stopPropagation.attlist"&gt;
    &lt;xs:attribute name="event" use="required" type="xs:QName"/&gt;
    &lt;xs:attribute name="id" type="xs:ID"/&gt;
  &lt;/xs:attributeGroup&gt;

  &lt;xs:complexType name="stopPropagation.type"&gt;
    &lt;xs:attributeGroup ref="stopPropagation.attlist"/&gt;
  &lt;/xs:complexType&gt;

  &lt;xs:element name="<span class="element" id="a_smodule_element_stopPropagation">stopPropagation</span>" type="stopPropagation.type"/&gt;

  &lt;xs:attributeGroup name="preventDefault.attlist"&gt;
    &lt;xs:attribute name="event" use="required" type="xs:QName"/&gt;
    &lt;xs:attribute name="id" type="xs:ID"/&gt;
  &lt;/xs:attributeGroup&gt;

  &lt;xs:complexType name="preventDefault.type"&gt;
    &lt;xs:attributeGroup ref="preventDefault.attlist"/&gt;
  &lt;/xs:complexType&gt;

  &lt;xs:element name="<span class="element" id="a_smodule_element_preventDefault">preventDefault</span>" type="stopPropagation.type"/&gt;
&lt;/xs:schema&gt;

</pre>
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<h2 id="a_schema_xml_script" >B.4. XML Scripting Module
</h2>






<!-- INCLUDING SCHEMA SCHEMA/xml-script-1.xsd.mhtml -->







<pre class="dtd">
&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;xs:schema 
    targetNamespace="http://www.w3.org/2001/xml-events" 
    xmlns="http://www.w3.org/2001/xml-events" 
    xmlns:xh11d="http://www.w3.org/1999/xhtml/datatypes/"
    xmlns:xs="http://www.w3.org/2001/XMLSchema" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://www.w3.org/2001/XMLSchema 
                        http://www.w3.org/2001/XMLSchema.xsd" 
    elementFormDefault="unqualified" 
    blockDefault="#all" 
    finalDefault="#all" 
    attributeFormDefault="unqualified"&gt;

  &lt;xs:annotation&gt;
    &lt;xs:documentation&gt;
      This is the XML Schema for XML Scripting

      URI: http://www.w3.org/MarkUp/SCHEMA/xml-script-1.xsd
      $Id: Overview.html,v 1.2 2010/12/17 20:25:20 plehegar Exp $
    &lt;/xs:documentation&gt;
    &lt;xs:documentation source="xml-events-copyright-2.xsd"/&gt;
  &lt;/xs:annotation&gt;

  &lt;xs:attributeGroup name="script.attlist"&gt;
    &lt;xs:attribute name="encoding" type="xh11d:Charset"/&gt;
    &lt;xs:attribute name="implements" type="xh11d:URIorSafeCURIEs"/&gt;
    &lt;xs:attribute name="src" type="xs:anyURI"/&gt;
    &lt;xs:attribute name="type" type="xh11d:ContentTypes"/&gt;
    &lt;xs:attribute name="id" type="xs:ID"/&gt;
  &lt;/xs:attributeGroup&gt;

  &lt;xs:complexType name="script.type"&gt;
    &lt;xs:attributeGroup ref="script.attlist"/&gt;
  &lt;/xs:complexType&gt;

  &lt;xs:element name="<span class="element" id="a_smodule_element_script">script</span>" type="script.type"/&gt;
&lt;/xs:schema&gt;

</pre>
<!-- END OF FILE SCHEMA/xml-script-1.xsd.mhtml -->




<!--OddPage-->



      
      
    




<h1 id="s_refs" >C. References
</h1>



	
	


<p>This appendix is <em>normative</em>.</p>








<h2 id="s_norm-refs" >C.1. Normative References
</h2>






<dl>
<dt>[<a id="ref_DOM3EVENTS" 
class="normref">DOM3EVENTS</a>]</dt>

<dd>"<cite><a href="http://www.w3.org/TR/DOM-Level-3-Events/"
>Document Object Model (DOM) Level 3 Events Specification</a></cite>",
W3C Recommendation, Björn Höhrmann, <i><abbr title="editor">ed.</abbr></i>,
21 December 2007.<br />
Available at: http://www.w3.org/TR/DOM-Level-3-Events/<br />
The <a href="http://www.w3.org/TR/DOM-Level-3-Events">latest version</a>
is available at: http://www.w3.org/TR/DOM-Level-3-Events</dd>

<dt><a id="ref_RFC2119" class="normref">[RFC2119]</a></dt>

<dd>"<cite><a href="http://www.rfc-editor.org/rfc/rfc2119.txt">Key words for
use in RFCs to indicate requirement levels</a></cite>", RFC 2119,
S. Bradner, March 1997.<br /> 
Available at: http://www.rfc-editor.org/rfc/rfc2119.txt</dd>

<dt><a id="ref_RFC2616" class="normref">[RFC2616]</a></dt>

<dd>"<cite><a href="http://www.rfc-editor.org/rfc/rfc2616.txt">Hypertext Transfer
        Protocol - HTTP/1.1</a></cite>", RFC 2119,
H. Fielding <i xml:lang="lt">et al.</i>,
<i><abbr title="editors">eds.</abbr></i>, June 1999.<br />
Available at: http://www.rfc-editor.org/rfc/rfc2616.txt</dd>

<dt>[<a id="ref_XHTMLMOD">XHTMLMOD</a>]</dt>

<dd>"<cite><a href="http://www.w3.org/TR/2008/REC-xhtml-modularization-20081008"
        >Modularization of XHTML&#8482; 1.1</a></cite>", W3C Recommendation,
D. Austin <i xml:lang="lt">et al.</i>,
<i><abbr title="editors">eds.</abbr></i>, 8 October 2009.<br />
Available at: http://www.w3.org/TR/2008/REC-xhtml-modularization-20081008<br />
The <a href="http://www.w3.org/TR/xhtml-modularization">latest version</a>
is available at: http://www.w3.org/TR/xhtml-modularization</dd>

<dt>[<a id="ref_XML" class="normref">XML</a>]</dt>

<dd>"<cite><a href="http://www.w3.org/TR/2006/REC-xml-20060816">Extensible
Markup Language (XML) 1.0 (Fourth Edition)</a></cite>", W3C Recommendation,
T. Bray <i xml:lang="lt">et al.</i>,
<i><abbr title="editors">eds.</abbr></i>, 16 August 2006.<br />
Available at: http://www.w3.org/TR/2006/REC-xml-20060816<br />
The <a href="http://www.w3.org/TR/REC-xml">latest version</a>
is available at: http://www.w3.org/TR/REC-xml</dd>

<dt><a id="ref_XMLID" class="normref">[XMLID]</a></dt>

<dd>"<cite><a href="http://www.w3.org/TR/2005/REC-xml-id-20050909/">xml:id
Version 1.0</a></cite>", W3C Recommendation,
J. Marsh, D. Veillard, N. Walsh, <i><abbr title="editors">eds.</abbr></i>,
9 September 2005.<br />
Available at: http://www.w3.org/TR/2005/REC-xml-id-20050909/</dd>

<dt><a id="ref_XMLNAMES" class="ref">[XMLNAMES]</a></dt>

<dd>"<cite><a href="http://www.w3.org/TR/1999/REC-xml-names-19990114"
>Namespaces in XML</a></cite>", W3C Recommendation,
T. Bray <i xml:lang="lt">et al.</i>,
<i><abbr title="editors">eds.</abbr></i>, 14 January 1999.<br />
Available at: http://www.w3.org/TR/1999/REC-xml-names-19990114<br />
The <a href="http://www.w3.org/TR/REC-xml-names">latest version</a>
is available at: http://www.w3.org/TR/REC-xml-names</dd>

</dl>








<h2 id="s_other-refs" >C.2. Other References
</h2>






<dl>
<dt>[<a id="ref_HTML4" >HTML4</a>]</dt>

<dd>"<cite><a href="http://www.w3.org/TR/1999/REC-html401-19991224">HTML 4.01
Specification</a></cite>", W3C Recommendation,
D. Raggett <i xml:lang="lt">et al.</i>,
<i><abbr title="editors">eds.</abbr></i>, 24 December 1999.<br />
Available at: http://www.w3.org/TR/1999/REC-html401-19991224<br />
The <a href="http://www.w3.org/TR/html4">latest version</a>
is available at: http://www.w3.org/TR/html4</dd>

<dt><a id="ref_MIMETYPES" class="normref">[MIMETYPES]</a></dt>
<dd>"<cite><a href="http://www.iana.org/assignments/media-types/">MIME Media Types</a></cite>", 
IANA.<br /> 
Available at: http://www.iana.org/assignments/media-types/</dd>

<dt>[<a id="ref_SVG" >SVG</a>]</dt>

<dd>"<cite><a href="http://www.w3.org/TR/2001/REC-SVG-20010904/">Scalable
Vector Graphics (SVG) 1.0 Specification</a></cite>", W3C Recommendation,
J. Ferraiolo, <i><abbr title="editor">ed.</abbr></i>, 4 September 2001.<br />
Available at: http://www.w3.org/TR/2001/REC-SVG-20010904/<br />
The <a href="http://www.w3.org/TR/SVG/">latest version</a>
is available at: http://www.w3.org/TR/SVG/</dd>
	
<dt>[<a id="ref_XFORMS" >XFORMS</a>]</dt>

<dd>"<cite><a href="http://www.w3.org/TR/2004/WD-xforms11-20041115/">XForms
1.1</a></cite>", W3C Working Draft,
M. Dubinko <i xml:lang="la">et al.</i>,
<i><abbr title="editors">eds.</abbr></i>, 15 November 2004.<br />
Available at: http://www.w3.org/TR/2004/WD-xforms11-20041115/</dd>

<dt>[<a id="ref_XHTML" >XHTML</a>]</dt>

<dd>"<cite><a href="http://www.w3.org/TR/2002/REC-xhtml1-20020801">XHTML&#8482;
1.0: The Extensible HyperText Markup Language (Second Edition)</a></cite>".
S. Pemberton <i xml:lang="lt">et al.</i>, 26 January 2000,
revised 1 August 2002.<br />
Available at: http://www.w3.org/TR/2002/REC-xhtml1-20020801<br />
The <a href="http://www.w3.org/TR/xhtml1">latest version</a>
is available at: http://www.w3.org/TR/xhtml1</dd>

<dt><a id="ref_XPATH" class="ref">[XPATH]</a></dt>
<dd>"<cite><a href="http://www.w3.org/TR/1999/REC-xpath-19991116"
>XML Path Language</a></cite>", W3C Recommendation,
James Clark, <i xml:lang="lt">et al.</i>,
<i><abbr title="editors">eds.</abbr></i>, 16 November 1999.<br />
Available at: http://www.w3.org/TR/1999/REC-xpath-19991116<br />
The <a href="http://www.w3.org/TR/xpath">latest version</a>
is available at: http://www.w3.org/TR/xpath</dd>
</dl>

<!--OddPage-->



      
      
    




<h1 id="s_changes" >D. Change History
</h1>



	
	

<p><em>This section is informative.</em></p>
<p>In developing version 2 of XML Events, the following major
changes have been made:</p>
<ul>
    <li>Changed from using DOM 2 Events to DOM 3 Events.</li>
    <li>Added XML Handlers Module.</li>
    <li>Added XML Scripting Module.</li>
    <li>Added XML Schema implementation of modules.</li>
    <li>Permitted incorporation of elements and attributes into
    other namespaces.</li>
</ul>

<!--OddPage-->



      
      
    




<h1 id="s_acks" >E. Acknowledgments
</h1>



	
	


<p><em>This section is informative.</em></p>

<p>This document was prepared by
the <acronym title="World Wide Web Consortium">W3C</acronym>
<acronym title="Extensible HyperText Markup Language">XHTML2</acronym> Working Group.
The members at the time of publication of the Note were:</p>

<ul>
<li>Markus Gylling, <a href="http://www.daisy.org">DAISY Consortium</a>
(<acronym title="Extensible HyperText Markup Language">XHTML</acronym> 2 Working Group Co-Chair)</li>
<li>Steven Pemberton, <acronym title="Centrum voor Wiskunde en Informatica"
    xml:lang="nl">CWI</acronym> 
(<acronym title="Extensible HyperText Markup Language">XHTML</acronym> 2 Working Group Co-Chair)</li>
<li>Mark Birbeck, Sidewinder Labs (Invited Expert)</li>
<li>Susan Borgrink, Progeny Systems</li>
<li>Christina Bottomley, Society for Technical Communication (STC)</li>
<li>Alessio Cartocci, International Webmasters Association / HTML Writers Guild (IWA-HWG)</li>
<li>Alexander Graf, University of Innsbruck</li>
<li>Tina Holmboe, Greytower Technologies (Invited Expert)</li>
<li>John Kugelman, Progeny Systems</li>
<li>Luca Mascaro, International Webmasters Association / HTML Writers Guild (IWA-HWG)</li>
<li>Shane McCarron, Applied Testing and Technology, Inc. (Invited Expert)</li>
<li>Michael Rawling, IVIS Group Limited</li>
<li>Gregory Rosmaita, Invited Expert</li>
<li>Sebastian Schnitzenbaumer, Dreamlab Technologies AG</li>
<li>Richard Schwerdtfeger,
<acronym title="International Business Machines">IBM</acronym></li>
<li>Elias Torres, 
<acronym title="International Business Machines">IBM</acronym></li>
<li>Masataka Yakura, Mitsue-Links Co., Ltd.</li>
<li>Toshihiko Yamakami, ACCESS Co., Ltd. </li>
</ul>


<p>At publication of the first edition, the acknowledgements included was:</p>

<p>This document was originally edited by Ted Wugofski (Openwave).</p>

<p>Special acknowledgments to: Mark Baker (Sun Microsystems), Wayne Carr
(Intel Corporation), Warner ten Kate (Philips Electronics), Patrick Schmitz,
and Peter Stark (Ericsson) for their significant contributions to the
evolution of this specification.</p>

<p>At the time of publication, the participants in the W3C HTML Working Group
were:</p>

<ul class="acks">
<li>Steven Pemberton, <abbr>CWI</abbr>/<abbr>W3C</abbr> (HTML Working Group Chair)</li>
<li>Daniel Austin, W. W. Grainger, <abbr>Inc.</abbr></li>
<li>Jim Bigelow, Hewlett-Packard Company</li>
<li>Mark Birbeck, x-port.net <abbr title="Limited">Ltd.</abbr>
(Invited Expert)</li>
<li>Jonny Axelsson, Opera Software</li>
<li>Tantek &#199;elik, Microsoft Corporation</li>
<li>Beth Epperson, Netscape/<abbr title="America Online">AOL</abbr></li>
<li>Masayasu Ishikawa, <abbr>W3C</abbr> (Team Contact)</li>
<li>Shin'ichi Matsui, Panasonic</li>
<li>Shane McCarron, Applied Testing and Technology (Invited Expert)</li>
<li>Ann Navarro, WebGeek, <abbr>Inc.</abbr> (Invited Expert)</li>
<li>Subramanian Peruvemba, Oracle Corporation</li>
<li>Sebastian Schnitzenbaumer, SAP <abbr xml:lang="de"
title="Aktiengesellschaft">AG</abbr></li>
</ul>


</body>
</html>