RDFCoreWGCharter
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<?xml version="1.0" encoding="iso-8859-1"?>
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<meta name="generator" content="HTML Tidy, see www.w3.org" />
<title>W3C Semantic Web: RDF Core Working Group Charter</title>
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content="text/html; charset=iso-8859-1" />
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<p><a href="http://www.w3.org/"><img border="0"
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<h1>W3C RDF Core Working Group Charter</h1>
<h2>1. Purpose and Scope</h2>
<p>This is the charter for an <a href="RDFCore/">RDF Core
Working Group</a>, managed under the <a href="/2001/sw/">W3C
Semantic Web Activity</a>. Implementor feedback concerning the
RDF <a
href="http://www.w3.org/TR/1999/REC-rdf-syntax-19990222/">Model
and Syntax Recommendation</a> points to the need for a number
of fixes, clarifications and improvements to the specification
of RDF's abstract model and XML syntax. There is also
considerable interest in the exploration of alternative XML
serialization mechanisms for RDF data. The role of the RDF Core
WG is to prepare the way for such work by stabilizing the core
RDF specifications. The RDF Core WG is neither chartered to
develop a new RDF syntax, nor to reformulate the RDF model.
However, the group is expected to re-articulate the RDF model
and syntax specification in such a way as to better facilitate
future work on alternative XML encodings for RDF.</p>
<p>The RDF Core WG is chartered to complete the work on RDF
vocabulary description present in the <a
href="http://www.w3.org/TR/2000/CR-rdf-schema-20000327/">RDF
Schema Candidate Recommendation</a>. The Working Group will
address questions and issues raised on the public comments
feedback list and the RDF Interest Group list during the
Candidate Recommendation period and will produce an updated W3C
specification. The specific type of Technical Report to
publish; whether Working Draft, updated Candidate
Recommendation, or Proposed Recommendation will be decided by
consensus of the Working Group according to the number and
nature of any changes that are made to the previous
version.</p>
<p>Following the <a
href="http://www.w3.org/TR/1999/NOTE-schema-arch-19991007">
Cambridge Communique</a> meeting, feedback received on the RDF
Schema Candidate Recommendation, and ongoing discussions in the
XML and RDF developer community, the RDF Core WG must provide
an account of the relationships between the basic components of
RDF (Model, Syntax, Schema) and the larger XML family of
recommendations.</p>
<h2>2. Requirements</h2>
<p>RDF provides a common framework for representing metadata
across many applications. The semantics and structure of many
varieties of metadata will be specified by independent
communities. RDF provides an infrastructure that is
sufficiently general and flexible to support these disparate
applications.</p>
<p>In order to support interoperability across these disparate
applications, a clarification and re-articulation of the core
RDF specifications is required. The RDF Core WG must address
the issues raised on www-rdf-comments against the RDF Schema
1.0 Candidate Recommendation and the RDF Model and Syntax
Recommendation.</p>
<h3>Deployment Considerations</h3>
<p>Backwards compatibility with existing RDF applications is a
priority for the RDF Core Working Group. Since the web is in
continuous operation, it is the responsibility of this working
group to ensure graceful deployment of corrections to the RDF
specifications by carefully considering both the impact of new
RDF documents on extant software, and the impact of revised
software on extant documents.</p>
<p>At the same time, since the web is growing rapidly, it is
the responsibility of this group to not let near-term
deployment considerations grossly increase the future costs (to
implementors, authors, users, etc.) of new features.</p>
<h3>RDF Model and Syntax Requirements</h3>
<p>The RDF Core WG must address the issues listed in the <a
href="http://www.w3.org/2000/03/rdf-tracking/">RDF Issue
Tracking</a> document, liaising (via the Semantic Web
Coordination Group) with other W3C groups where issues need to
be addressed at a cross-WG level.</p>
<p>The RDF Core group must take into account the various
formalizations of RDF that have been proposed since the
publication of the RDF Model and Syntax Recommendation. The
group is encouraged to make use both of formal techniques and
implementation-led test cases throughout their work.</p>
<h3>RDF Schema Requirements</h3>
<p>The goal of RDF Schema is to support an incrementally
extensible approach to representing semantics in machine
understandable form and to provide a simple base that can be
extended by more powerful representational systems. The RDF
schema system must provide an extensibility mechanism to allow
future work (for example on Web Ontology and logic-based Rule
languages) to provide richer facilities.</p>
<p>RDF Schema must be expressed in terms of the RDF model, and
must use W3C RDF syntax. RDF Schema must use and build upon XML
Schema datatypes to the fullest extent that is practical and
appropriate. Specifically, the RDF Core Working Group is not
chartered to develop a separate data typing language that
duplicates facilities provided by XML Schema data types.</p>
<h2>3. Relationships and Dependencies</h2>
<p>Coordination with other groups will be managed through the
<a href="http://www.w3.org/2001/sw/CGcharter">Semantic Web
Coordination Group</a>.</p>
<p>The Topic Maps community have produced an XML-based Topic
Map serialization syntax (XTM), and the W3C XML Protocol
Working Group is already chartered to produce a similar
mechanism. The XML Protocol Working Group Charter lists as a
goal the creation of a <a
href="http://www.w3.org/2000/09/XML-Protocol-Charter#representation">
"mechanism for serializing data representing non-syntactic data
models such as object graphs and directed labeled graphs, based
on the datatypes of XML Schema"</a>. The RDF Core WG will need
to liaise with the XML Protocol Working Group and XTM
communities to ensure that the RDF Core specifications are
produced with consideration for possible future work on
alternate RDF syntaxes.</p>
<h2>4. Deliverables</h2>
<p>The RDF Core WG is expected to begin work upon announcement
of the Semantic Web Activity, and to meet face to face between
two and four times prior to completion of their work in January
2002.</p>
<h3>Deliverables</h3>
<p>The deliverables of RDF Core WG are as follows.</p>
<ul>
<li>update and maintain the RDF <strong>Issue
Tracking</strong> document</li>
<li>publish a set of machine-processable <strong>test
cases</strong> corresponding to technical issues addressed by
the WG</li>
<li>provide an update of the <strong>errata and status
pages</strong> for the RDF specifications</li>
<li>update the RDF <strong>Model and Syntax
Specification</strong> (as one, two or more documents)
clarifying the model and fixing issues with syntax</li>
<li>complete work on <strong>RDF Schema</strong> 1.0
Specification</li>
<li>provide an account of the <strong>relationship between
RDF and the XML family of technologies</strong> (particularly
Schemas and Infoset/Query)</li>
</ul>
<h3>Schedule</h3>
<p>The following schedule is planned. Revisions of this
schedule must be agreed through the Semantic Web <a
href="CGcharter">Coordination Group</a>.</p>
<ul>
<li>April 2001 - Working group formation</li>
<li>May 2001 - Publish revised issue list; initial update
M+S Errata page</li>
<li>First face to face (June 2001)</li>
<li>August 2001 - Public release of Schema and Model/Syntax
documents</li>
<li>Late September 2001, face to face meeting (Cambridge MA,
USA)</li>
<li>Late October 2001 - last call release for RDF Core WG
documents</li>
<li>Candidate Recommendations expected during December
2001</li>
<li>Proposed Recommendations expected for early February
2002</li>
</ul>
<p>The group is expected to close down in early 2002.</p>
<h2>5. Meetings and WG Membership</h2>
<p>The Working Group will conduct its primary discussion via
electronic mail. The mail archive will be publicly readable,
however posting to the mailing list will be restricted to
Working Group participants. Public input should be via the <a
href="http://lists.w3.org/Archives/Public/www-rdf-comments/">
www-rdf-comments</a> list, to which this Working Group will be
expected to read and respond.</p>
<p>Working Group members will need to be familiar with the RDF
Model and Syntax Specification, RDF Schema 1.0 Specification,
and other related XML specifications (particularly XML Schema),
and will ideally have implementation experience with RDF-based
applications.</p>
<p>Teleconferences and face to face meetings will be scheduled
as necessary to facilitate the work. Two to four face to face
meetings are anticipated. Participants will be expected to
typically devote a minimum of twelve hours per week, exclusive
of face-to-face meetings, to this working group. Maintaining
communication with the wider RDF developer community through <a
href="/RDF/Interest/">RDF Interest Group</a> channels (<a
href="http://lists.w3.org/Archives/Public/www-rdf-interest/">www-rdf-interest</a>,
<a href="http://lists.w3.org/Archives/Public/www-rdf-logic/">
www-rdf-logic</a>, <a
href="http://www.w3.org/RDF/Interest/#irc">IRC chat</a>) will
also be important aspects of the group's work.</p>
<p>Participation in the Working Group is available to
individuals nominated by their W3C Advisory Representatives.
The Working Group chairs may grant <a
href="/Consortium/Process/Process-19991111/organization.html#invited-expert">
invited expert</a> status to other members of the Web community
at their discretion.</p>
<h2><a id="IPR" name="IPR">6. Intellectual Property</a></h2>
<p>W3C promotes an open working environment. Whenever possible,
technical decisions should be made unencumbered by intellectual
property right (IPR) claims. W3C's policy for intellectual
property is set out in <a
href="http://www.w3.org/Consortium/Process/#ipr">section 2.2 of
the W3C Process Document</a>.</p>
<p>Members participating in this Working Group are expected to
disclose any intellectual property they have in this area. Any
intellectual property essential to implement specifications
produced by this Activity must be available on a
<b>royalty-free</b> basis. At the suggestion of the Working
Group, and at the discretion of the W3C Director, possibly
requiring overall review by the Advisory Committee, technologies
may be accepted if they are licensed on reasonable,
non-discriminatory terms.</p>
<p>Members disclose patent and other IPR claims by sending email
to an archived mailing list that is readable by Members and the
W3C Team: <a
href="http://lists.w3.org/Archives/Member/patent-issues/">
http://lists.w3.org/Archives/Member/patent-issues/</a> (<a
href="http://cgi.w3.org/MemberAccess/AccessRequest">Member-only</a>) . Members
must disclose all IPR claims to this mailing list but they may
also copy other recipients. Patent disclosures considered
relevant to the specification produced by the Working Group will
be made public.</p>
<h2>7. Contacts</h2>
<p>The chairs of the group are <a
href="mailto:brian_mcbride@hp.com">Brian McBride</a> (<a
href="http://www.hpl.hp.com/">HP Labs</a>) and <a
href="mailto:danbri@w3.org">Dan Brickley</a> (<a
href="http://www.w3.org/">W3C</a>/<a
href="http://ilrt.org/">ILRT</a>)</p>
<p>The W3C staff contact is <a href="mailto:em@w3.org">
Eric Miller</a>, Semantic Web Activity lead.</p>
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