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<p style="text-align: center"><a href="/2001/sw/">Semantic Web</a> | <a
href="/2006/07/swig-charter.html">charter</a> | <a
href="http://lists.w3.org/Archives/Public/semantic-web/">semantic-web</a> |
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href="http://esw.w3.org/topic/FrontPage">ESW Wiki</a> | <a
href="http://planetrdf.com/">planetrdf weblogs</a></p>
<h1>Semantic Web Interest Group</h1>
<p>This is the homepage of W3C's Semantic Web Interest Group (SWIG),
previously known as the <a href="/RDF/Interest/">RDF Interest Group</a>. It
provides a public forum to discuss the use and development of the
<em>Semantic Web</em>. See the <a href="/2006/07/swig-charter.html">group's
charter</a> for details of its role and purpose.</p>
<p>The Semantic Web Interest Group is designed as a forum to support
developers and users of Semantic Web technologies (<a
href="http://www.w3.org/RDF/">RDF</a>, <a
href="http://www.w3.org/2004/OWL/">OWL</a>, <a
href="http://www.w3.org/TR/rdf-sparql-query/">SPARQL</a>, etc). The group in
particular serves to help developers create vocabularies and applications to
support a Web data marketplace combining harvesting, syndication, metadata
and Web Service techniques.</p>
<p>Membership of the group is open to all interested parties who accept the
group's <a href="/2006/07/swig-charter.html">charter</a>; W3C Membership is
not a prerequisite. To join the group, simply join our discussions; there is
no formal list of members.</p>
<p>The Interest Group functions primarily through public email lists hosted
by W3C. The main list is <semantic-web@w3.org> (see <a
href="http://lists.w3.org/Archives/Public/semantic-web/">archives</a>). Other
lists sponsored by the Interest Group include <a
href="http://lists.w3.org/Archives/Public/www-rdf-logic/">www-rdf-logic</a>,
<a
href="http://lists.w3.org/Archives/Public/www-rdf-calendar/">www-rdf-calendar</a>,
<a
href="http://lists.w3.org/Archives/Public/public-sparql-dev/">sparql-dev</a>,
and <a
href="http://lists.w3.org/Archives/Public/www-annotation/">www-annotation</a>.
The <a
href="http://lists.w3.org/Archives/Public/www-rdf-interest/">www-rdf-interest</a>
(1999-2005) was previously the main list for the IG.) The <a
href="/Mail/Request">Mailing List Administrivia page</a> explains how to join
these or other <a href="/Mail/">W3C discussion lists</a>.</p>
<p>The mailing lists are used for technical discussions. It is better to
avoid discussions on various non-technical subjects, for example on patents and
patent applications. If need be, separate mailing lists <em>may</em>
be set up at W3C or elsewhere for these.
</p>
<h3>Task Forces</h3>
<p>
The SWIG sometimes forms sub-groups to investigate specific topics. Current taskforces (see <a href="http://www.w3.org/QA/2011/09/proposing_two_new_sw_interest.html ">announcement</a>):</p>
<ul>
<li>Web Schemas TF (<a href="http://www.w3.org/wiki/WebSchemas">wiki</a>,
<a href="http://lists.w3.org/Archives/Public/public-vocabs/">mailing list</a>,
<a href="http://www.w3.org/2001/sw/interest/webschema.html">charter</a>), chaired by R.V.Guha (Google).</li>
<li>HTML Data TF (<a href="http://www.w3.org/wiki/Html-data-tf">wiki/charter</a>, <a href="http://lists.w3.org/Archives/Public/public-html-data-tf/">mailing list</a>), chaired by Jeni Tennison.</li>
</ul>
<h3>Blogs, Wikis, Directories, Meetups</h3>
<p>For some years, the <a href="http://planetrdf.com/">planetrdf.com</a> site has provided an aggregation of RDF-related blogs.</p>
<p>W3C also hosts the <a href="http://esw.w3.org/Main_Page">ESW Wiki</a>; this began in the <a href="http://www.w3.org/2001/sw/Europe/">SWAD-Europe</a> project
but was adopted by the wider SWIG community. W3C also now hosts a <a href="http://www.w3.org/2001/sw/wiki/Main_Page">Semantic Web standards</a> wiki.
</p>
<p>The <a href="#lod">Linked Data</a> LOD community project
maintain a wiki list of <a href="http://esw.w3.org/TaskForces/CommunityProjects/LinkingOpenData/CommonVocabularies">Common Vocabularies</a>.</p>
<p>
<a href="http://www.sindice.com/">Sindice</a> provides a lookup index into a large body of RDF data. This includes a useful
<a href="http://sindice.com/developers/inspector">inspector</a> utility.
</p>
<p>
Several members of the SWIG community have been sharing answers to common RDF/SemWeb questions on the
<a href="http://www.semanticoverflow.com/">SemanticOverflow</a> site.
</p>
<p>There are regular local “meetups” in the Semantic Web area around the globe. The <a href="http://w3.org/brief/MjIz">search result</a> on the “Meetup” site gives a link to most of those.</p>
<h3 id="swig_chan">24x7 chat: #swig IRC channel</h3>
<p>Many in the RDF/SW community make use of Internet Relay Chat (IRC)
channels for collaboration, in particular via the <a
href="http://freenode.net/">FreeNode</a> network (channel <a
href="irc://irc.freenode.net/swig">#swig</a> for general SWIG discussion).
The <a href="http://swig.xmlhack.com/">#swig
scratchpad</a>, a link annotation system, is provided by Edd Dumbill. It
selectively logs comments made in IRC, via an IRC bot '<code>dc_swig</code>'
(see <a href="http://usefulinc.com/chump/">chump</a> site for details).
Complete <a href="http://ilrt.org/discovery/chatlogs/swig/">public logs</a>
of the discussions on the #swig channel are also available (in text, html and
rdf flavours), thanks to Dave Beckett of ILRT.</p>
<p><strong>Note</strong>: IRC discussion should be considered public
(insecure, loggable etc). IRC chats are not a formal mechanism for W3C
Interest Group communications and discussion; it may be useful to circulate
summaries of IRC discussion to the archived RDF IG mailing lists.</p>
<p>IRC Resources: <a href="http://irchelp.org/">IRC Help</a>, <a
href="http://irc.org/">IRC.org</a>, <a
href="http://freenode.net/">OpenProjects IRC</a> (please read <a
href="http://freenode.net/using_the_network.shtml">about freenode: using the
network</a>).</p>
<h2>Linked Data</h2>
<a name="lod" id="lod"></a>
<p>
The <a href="http://esw.w3.org/SweoIG/TaskForces/CommunityProjects/LinkingOpenData">Linking Open Data</a> community project began
as an activity of the <a href="http://www.w3.org/2001/sw/sweo/">W3C SWEO group</a> (chartered <a href="http://www.w3.org/2006/07/sweoig-charter.html">2006-2008</a>). The project was inspired by <a href="http://www.w3.org/People/Berners-Lee/">Tim Berners-Lee</a>'s 2006
<a href="http://www.w3.org/DesignIssues/">DesignIssues</a> <a href="http://www.w3.org/DesignIssues/LinkedData.html">Linked Data</a> note. That
Note discussed the importance of URIs for linking RDF, and suggested some improvements to FOAF's
<a href="http://www.oreillynet.com/xml/blog/2003/12/dan_brickleys_rdfsseealso_rdf.html">hypertext RDF</a> design, which used some
<a href="http://www.w3.org/2001/sw/RDFCore/">pre-RDFCore</a> constructs. The Linked Data community evangelised these improved principles
very effectively, leading to a massive increase in the amount of public linked data in the Web.
</p>
<p>Increasingly, RDF and Semantic Web technologies show up in the wider world as "Linked Data". Key resources include <a href="http://linkeddata.org/">linkeddata.org</a>, the now-famous <a href="http://richard.cyganiak.de/2007/10/lod/">cloud diagram</a>, <a href="http://dbpedia.org/">DBpedia</a> (an RDF view of <a href="http://www.wikipedia.org/">Wikipedia</a>) and the <a href="lists.w3.org/Archives/Public/public-lod/">public-lod</a> mailing list.
See also <a href="http://blog.ted.com/2009/03/tim_berners_lee_web.php">TimBL's TED talk</a> and Wikipedia's <a href="http://en.wikipedia.org/wiki/Linked_Data">Linked Data</a> entry.
</p>
<h2>Common shallow ontologies and other topical discussions</h2>
<p>The SWIG has looked at various subject areas where "a little semantics
goes a long way". Some simple shallow ontologies for concepts shared by many
applications can play a very strong role in linking together many
applications.</p>
<p>Many of these are discussed in a mixture of email lists, IRC chat, and Wiki.</p>
<h3>Geospatial</h3>
This topic has been on the subject list of the Interest Group, but it then now
moved into a separate W3C Incubator Group. The the <a
href="http://www.w3.org/2005/Incubator/geo/">GEO XG’s home page</a> for
further details. The <a href="http://www.w3.org/2003/01/geo/">SWIG "Basic Geo" vocabulary</a> is quite widely used.
<h3>Calendaring</h3>
Time is the next dimension to consider as property which unites many data
systems. See the informal
<ul>
<li><a href="http://ilrt.org/discovery/2001/04/calendar/">RDF Calendaring
Task Force</a></li>
<li><a href="http://www.w3.org/2002/12/cal/">RDF Calendaring
workspace</a></li>
<li><a href="http://www.w3.org/TR/rdfcal/">RDF Calendar - an application of the Resource Description Framework to iCalendar Data</a>, by <a href="http://www.w3.org/People/Connolly/">Dan Connolly</a> and <a href="http://nicecupoftea.org/">Libby Miller</a> reports on the outcomes of this task force.
</li>
</ul>
<h3>Relational Databases and RDF</h3>
<ul>
<li>separate <a href="http://esw.w3.org/topic/RdfAndSql">RDF and SQL Wiki page</a>, see also <a href="http://esw.w3.org/SparqlImplementations">SPARQL implementations list</a></li>
<li>discussions happening on <a
href="http://lists.w3.org/Archives/Public/public-sparql-dev/">sparql-dev</a></li>
<li>The <a href="http://www.w3.org/2001/sw/rdb2rdf/">RDB2RDF Working Group</a> was <a href="http://www.w3.org/2009/08/rdb2rdf-charter">chartered</a> in 2009 to progress this work, building on the findings of an earlier <a href="http://www.w3.org/2005/Incubator/rdb2rdf/">incubator group</a>.</li>
</ul>
<h3>Personal Identity - FOAF</h3>
<p>The Friend of a Friend (FOAF) system is one in which people can describe
themselves in machine-processable form, including contact details and list of
people they know. Several million FOAF files <a href="http://www.w3.org/DesignIssues/LinkedData.html">link together</a> across the web.</p>
<ul>
<li><a href="http://www.foaf-project.org/">FOAF project</a></li>
<li><a href="http://rdfweb.org/topic/FoafProject">FOAF wiki</a></li>
<li>the <a href="http://xmlns.com/foaf/spec/">FOAF specification</a></li>
</ul>
<p>
A W3C Note describing an updated version of <a href="http://www.w3.org/TR/vcard-rdf/">vCard in RDF</a> is also available. In 2009 a <a href="http://www.w3.org/2005/Incubator/socialweb/">Social Web incubator group</a> was chartered to explore related issues.
</p>
<p>
Several SWIG and SocialWeb XG participants have collaborated on the <a href="http://esw.w3.org/Foaf%2Bssl">FOAF+SSL</a> work, which combines the use of
digital certificate technology with RDF's flexible approach to description. W3C hosts two experimental vocabularies to
support this work - <a href="http://www.w3.org/ns/auth/cert#">cert:</a> and <a href="http://www.w3.org/ns/auth/rsa#">rsa:</a>. At the time
of writing these are still under development and have not received formal review in any W3C process. Feedback on the design is welcome, either
on the <a href="http://lists.foaf-project.org/mailman/listinfo/foaf-protocols">foaf-protocols</a> list
or via the <a href="http://www.w3.org/2005/Incubator/socialweb/">Social Web incubator</a>.
</p>
<p>
The FOAF vocabulary is also accompanied by an experimental <a href="http://xmlns.com/wot/0.1/">'Web of Trust'</a> vocabulary, designed to support
<a href="http://usefulinc.com/foaf/signingFoafFiles">PGP-signing of RDF documents</a>. It has not undergone any formal security review, and discussion on
how to progress this work (and converge with X509-based signing) is welcome on the SWIG and FOAF lists.
</p>
<h3>Organizations</h3>
<p>In June 2010 the UK Government <a href="http://data.gov.uk">Linked Data project</a> <a
href="http://lists.w3.org/Archives/Public/public-lod/2010Jun/0000.html">contributed</a>
an ontology for describing organizations. This is <a
href="http://www.w3.org/ns/org">hosted</a> at W3C thanks to <a href="http://www.w3.org/People/Berners-Lee/">Tim Berners-Lee's</a>
involvement, and discussion of the work is
welcome on the <a href="http://lists.w3.org/Archives/Public/public-lod/">public-lod</a> and <a href="http://lists.w3.org/Archives/Public/public-egov-ig">public-egov-ig</a>
lists.</p>
<h3>Media formats</h3>
<ul>
<li>
In 2003, a SWIG collaboration produced the <a href="http://www.w3.org/2003/12/exif/">EXIF vocabulary workspace</a>, based on an RDF schema
contributed by Masahide Kanzaki (<a href="http://www.kanzaki.com/" xml:lang="ja" hreflang="ja">神崎正英</a>).
</li>
<li>A <a href="http://www.w3.org/2005/Incubator/mmsem/">Multimedia Semantics</a> incubator group ran from 2006-7. It's outputs included <a href="http://www.w3.org/2005/Incubator/mmsem/XGR-image-annotation/">Image annotation on the Semantic Web</a> and
<a href="http://www.w3.org/2005/Incubator/mmsem/XGR-vocabularies/">Multimedia Vocabularies on the Semantic Web</a>.</li>
<li>In 2008 W3C chartered a <a href="http://www.w3.org/2008/WebVideo/Annotations/">Media Annotations Working Group</a> and a <a href="http://www.w3.org/2008/WebVideo/Fragments/">Media Fragments Working Group</a> as part of its <a href="http://www.w3.org/2008/WebVideo/">Video in the Web Activity</a>.</li>
</ul>
<h3>Web Architecture vocabularies</h3>
<a name="arch" id="arch"></a>
<ul>
<li>The <a href="http://www.w3.org/2006/gen/ont">gen/ont</a> from TimBL provides "an Ontology for Relating Generic and Specific Information Resources".</li>
<li>The <a href="http://www.w3.org/TR/#tr_Evaluation_and_Report_Language__EARL_">EARL</a> vocabulary comes with some support for <a href="http://www.w3.org/TR/2009/WD-Content-in-RDF10-20091029/">Representing Content in RDF</a>, as well as <a href="http://www.w3.org/TR/2009/WD-Pointers-in-RDF10-20091029/">Pointers</a> and <a href="http://www.w3.org/TR/2009/WD-HTTP-in-RDF10-20091029/">HTTP structures</a></li>
<!--
<li>For the W3C TAG, <a href="http://www.w3.org/2001/tag/issu.n3">issu.n3</a> and <a href="http://www.w3.org/2001/tag/ont.n3">ont.n3</a></li>
-->
</ul>
<h3>Misc.</h3>
<a name="misc" id="misc"></a>
<p>
Other w3.org RDF vocabs of unknown status<a href="http://www.everythingismiscellaneous.com/">...</a>
</p>
<ul>
<li>
<a href="http://www.w3.org/2002/07/meeting.n3">meeting.n3</a>
</li>
<li><a href="http://www.w3.org/2004/06/rei.n3">rei.n3</a></li>
<li><a href="http://www.w3.org/2006/vcard/ns.n3">vcard ns</a> (possibly superceded by note)</li>
<li><a href="http://www.w3.org/2007/ont/cert.n3">cert.n3</a> ("probably superceded" --timbl)</li>
<li><a href="http://www.w3.org/2007/ont/currency.n3">currency.n3</a> (user community >= 1, timbl)</li>
<li><a href="http://www.w3.org/2007/ont/ldif.n3">ldif.n3</a> (mapping of <a href="http://en.wikipedia.org/wiki/LDAP_Data_Interchange_Format">LDIF</a> to RDF)</li>
<li><a href="http://www.w3.org/2007/ont/link.n3">link.n3</a> ("linked data stuff, used by the Tabulator for recording what it deduced from HTTP" --timbl)</li>
<li><a href="http://www.w3.org/2007/ont/lod.n3">lod.n3</a></li>
<li><a href="http://www.w3.org/2007/ont/meta.n3">meta.n3</a></li>
<li><a href="http://www.w3.org/2007/ont/o2.n3">o2.n3</a></li>
<li><a href="http://www.w3.org/2007/ont/unit.n3">unit.n3</a></li>
<li><a href="http://www.w3.org/2007/ont/unit_ex.n3">unit_ex.n3</a></li>
<li><a href="http://www.w3.org/2007/ont/xml.n3">xml.n3</a> ("for reading an XML file and then doing rules on it (instead of using XSLT)" --timbl</li>
<li><a href="http://www.w3.org/ns/auth/acl.n3">acl.n3</a>, an approach to access control, related to <a href="http://www.w3.org/ns/auth/cert.n3">cert.n3</a> (see foaf+ssl above)</li>
<li><a href="http://www.w3.org/ns/pim/trip.n3">trip.n3</a></li>
<li><a href="http://www.w3.org/2001/04/roadmap/vocab#">W3C roadmap model</a>, also <a href="http://www.w3.org/2001/02pd/gv#">graphviz/dot vocab</a>; see <a href="http://www.w3.org/2001/02pd/">Circles and arrows diagrams using stylesheet rules</a> writeup.</li>
<li><a href="http://www.w3.org/2001/04/roadmap/org">W3C Org model</a></li>
</ul>
<h3>Vocabulary Status vocabulary</h3>
<p>
As we develop RDF vocabularies in a grassroots fashion, it is important to indicate their status. One approach to this problem is
to use the <a href="http://www.w3.org/2003/06/sw-vocab-status/ns.rdf">Vocabulary Status</a> vocabulary. This was initially developed by
members of the SWIG and FOAF communities, and has since 2003 become fairly widely used. It is itself not yet well documented, but an initial
draft towards a W3C Note is <a href="http://www.w3.org/2003/06/sw-vocab-status/note.html">available</a>. Discussion is welcome in all the usual SWIG fora.
</p>
<p>See also the <a href="http://www.w3.org/2006/07/SWD/">Semantic Web Deployment</a> which takes on specific efforts in this sort of area.</p>
<h3>Meetings</h3>
<ul>
<li><a href="http://esw.w3.org/SwigAtTp2008">SWIG F2F at 2008 Tech Plenary</a>, Cannes Mandelieu, France. No formal
meeting summary, but see <a href="http://chatlogs.planetrdf.com/swig/2008-10.html">#swig</a> archives for <a href="http://chatlogs.planetrdf.com/swig/2008-10-20.html">Oct 20</a> and <a href="http://chatlogs.planetrdf.com/swig/2008-10-21.html">Oct 21</a>.
</li>
<li>3rd face to face meeting, Thursday 2nd March 2006, Cannes Mandelieu,
France. (<a href="http://esw.w3.org/topic/SwigAtTp2006">wiki-based
agenda</a>; see also <a
href="http://lists.w3.org/Archives/Public/semantic-web/2006Jan/0241.html">initial
mail</a> for more info)</li>
<li><a href="meetings/tp2005.html">2nd face to face meeting, 28 Feb & 1
March 2005, Boston USA</a> (see also <a
href="http://esw.w3.org/topic/SwigAtTp2005">SwigAtTP2005</a> in wiki)</li>
<li><a href="meetings/tp2004">1st face to face meeting, 1-2 March 2004,
Cannes-Mandelieu, France</a></li>
<li><a href="../../02/rdfig-f2f/">RDF IG meeting, 26-27 Feb 2001, Cambridge
MA, USA</a></li>
</ul>
<hr />
<address class="contact">
<a href="http://danbri.org/">Dan Brickley</a> (Semantic Web Interest Group
chair) and <a href="http://www.w3.org/People/Ivan/">Ivan Herman</a>
<ivan@w3.org>, (W3C) Semantic Web Activity Lead and Semantic Web
Interest Group Staff Contact
</address>
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