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<a href="/2001/sw/">Semantic Web</a> &rarr;


<h1>Protocol for Web Description Resources (POWDER) Working Group </h1>

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<p class="baseline">The POWDER Working Group is specifying a protocol for

publishing descriptions of (e.g. metadata about) Web resources using <a

href="/RDF/">RDF</a>, <a

href="/2004/OWL/">OWL</a>, and <a

href="/Protocols/">HTTP</a>.</p>

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<div class="toc">

<h4>Also On This Page &rarr;</h4>

<ul>

  <!--

            <li style="display: none"><a href="#start">Start</a> &middot;</li>

            <li><a href="#sched">Schedule/Deliverables/Milestones</a> &middot;</li>

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  <li><a href="#wg">Working Group</a> &middot;</li>

  <li><a href="#specs">Publications</a> &middot;</li>

  <li><a href="#tools">Tools</a> &middot; </li>

  <li><a href="#mailing">Mailing Lists &amp; Blogs</a> &middot;</li>

  <li><a href="#dependencies">Relationship with Other W3C Work</a></li>

</ul>

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<div class="events box">

<h4 id="current">Current and Upcoming Events</h4>


<ul>

  <li><strong class="date">1 September '09</strong> POWDER is a W3C Recommendation!</li>

</ul>


<div>

<small><a href="/Member/Eventscal">&hellip; more W3C Events</a></small></div>

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<div class="toolbox box" style="margin-bottom: 1em">

<h4>Nearby</h4>

<ul>

  <li>Read our <a href="blog">Blog</a></li>

  <li><a href="Group">Member-only Group page</a></li>

  <li>Mailing list archives: <a

    href="http://lists.w3.org/Archives/Public/public-powderwg/">public-powderwg</a>,

    <a

    href="http://lists.w3.org/Archives/Member/member-powderwg/">member-powderwg</a></li>

</ul>

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<div>

<p style="font-weight: bold">The POWDER Working Group is closed. This page is maintained for historial purposes only.</p>
</div>

<div>

<h2 id="wg">POWDER Working Group</h2>


<p>The <strong><a href="Group/">POWDER Working Group</a></strong>

(<a href="http://cgi.w3.org/MemberAccess/AccessRequest">member only link</a>)

is delighted that its <a href="/2007/02/powder_charter">chartered</a> work is done with the publication of the document suite as Recommendations.</p>
<p>POWDER has superseded <a href="http://www.w3.org/PICS/"><abbr title="Platform for Internet Content Selection">PICS</abbr></a>
as the recommended method for describing Web sites and building applications that act on such descriptions.
A comparison of PICS and POWDER is <a href="http://www.w3.org/2009/08/pics_superseded.html">available separately</a>.</p>

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<div>

<h2 id="specs">Publications</h2>


<dl>

  <dt id="dr"><a href="http://www.w3.org/TR/powder-dr/">POWDER: Description Resources</a></dt>

  <dd>W3C Recommendation 1 September 2009</dd>


  <dt><a href="http://www.w3.org/TR/powder-grouping/">POWDER: Grouping of Resources</a></dt>

  <dd>W3C Recommendation 1 September 2009</dd>


  <dt><a href="http://www.w3.org/TR/powder-formal/">POWDER: Formal Semantics</a></dt>

  <dd>W3C Recommendation 1 September 2009</dd>


  <dt><a href="http://www.w3.org/TR/2009/NOTE-powder-primer-20090901/">POWDER: Primer</a></dt>

  <dd>W3C Working Group Note 1 September 2009</dd>


  <dt><a href="http://www.w3.org/TR/powder-test/">POWDER: Test Suite</a></dt>

  <dd>W3C Working Group Note 10 September 2009</dd>


  <dt><a href="/TR/2007/NOTE-powder-use-cases-20071031">POWDER: Use Cases and Requirements</a></dt>

  <dd>W3C Working Group Note, 31 October 2007</dd>


  <dt><a href="http://www.w3.org/2007/05/powder-s"> POWDER: POWDER-S Vocabulary (WDRS)</a></dt>

  <dd>Namespace document 30 April 2009</dd>


  <dt><a href="http://www.w3.org/2007/05/powder">XML Schema for POWDER and POWDER-BASE</a></dt>

  <dd>This is the namespace document/schema for POWDER. The namespace URI (<a href="http://www.w3.org/2007/05/powder">http://www.w3.org/2007/05/powder</a>)

  is dereferenced to a schema at http://www.w3.org/2007/05/powder/wdr.xsd which in turn imports two others at

  http://www.w3.org/2007/05/powder/wdrb-p.xsd and http://www.w3.org/2007/05/powder/wdrb-c.xsd</dd>

</dl>


</div>


<div>

<h2 id="tools">Tools</h2>

<dl>

  <dt id="powder-validator"><a href="http://i-sieve.com/powdervalidator/">POWDER Validator</a></dt>

  <dd>This is part of a suite of tools developed and maintained by <a href="http://i-sieve.com/powder/">i-sieve Technologies</a>.</dd>


  <dt id="pp1"><a href="http://i-sieve.com/powderprocessor/">POWDER Processor</a></dt>

  <dd>This tool implements all features of a POWDER Processor required for conformance as defined in the <a href="#dr">Description Resources
	document</a>. It uses some of the code from the validator, 	makes use of a MySQL database, and is written in Perl.</dd>


  <dt id="pp2"><a href="http://dawsec.dicom.uninsubria.it/andrea/ppp/">PHP POWDER Processor</a> (3P)</dt>

  <dd>A second conformant POWDER processor with different ancillary features.</dd>


  <dt id="sempp"><a href="http://transonto.sourceforge.net/">TransOnto, a Semantic POWDER Processor</a></dt>

  <dd>A knowledge transformation and migration system for transferring knowledge between semantic representations

	that acts as a POWDER-S processor. It uses <a href="http://jena.sourceforge.net/">Jena</a> and <a href="http://clarkparsia.com/pellet/">Pellet</a> and

	offers a command line interface.</dd>


  <dt id="p2pbt"><a href="http://i-sieve.com/cgi-bin/pdr_to_base.cgi">POWDER to POWDER-BASE transformation tool</a></dt>

  <dd>This uses a subset of the validator to validate a POWDER document and return a POWDER-BASE transformation of it.
	The script is documented on the <a href="http://i-sieve.com/powdervalidator/">validator</a> page.</dd>


  <dt id="p2bxslt"><a href="powder2powderBase.xsl">POWDER to POWDER-BASE XSLT</a></dt>

  <dd>Uses XSLT 2 to transform any POWDER document to the equivalent POWDER-BASE document.</dd>


  <dt id="b2sxslt"><a href="powderBase2powderS.xsl">POWDER-BASE to POWDER-S XSLT</a></dt>

  <dd>Uses only XSLT 1 to transform POWDER-BASE to POWDER-S</dd>


  <dt id="p2sxslt"><a href="powder2powderS.xsl">POWDER to POWDER-S XSLT</a></dt>

  <dd>This is a combined version of the two XSLTs. It is simply a copy of the POWDER to POWDER-BASE XSLT
      with an additional element that includes the POWDER-BASE to POWDER-S stylehseet. It is <strong>this</strong>
	stylesheet that is referenced in the GRDDL (<code>data-view:transformation</code>) attribute of POWDER's
	<a href="http://www.w3.org/2007/05/powder">XML Schema</a>.</dd>

  <dt id="grouptool"><a href="http://philarcher.org/cgi-bin/powder-group.cgi">POWDER Grouping Tester</a></dt>

  <dd>A tool to help develop and test POWDER IRI sets.</dd>


</dl>


<h3>Obsolete documents</h3>

<dl>

<dt><a href="/TR/2007/WD-powder-voc-20070925/">POWDER: Web Description Resources (WDR) Vocabulary</a></dt>

<dd>W3C First Public Working Draft, 25 September 2007. This document was made obsolete by the development of the POWDER XML Schema.</dd>

<dt><a href="http://www.w3.org/TR/powder-xsd/">POWDER: Web Description Resources Datatypes (WDRD)</a></dt>

<dd>W3C Working Draft Draft 25 September 2007. This document was made obsolete by the development of the POWDER XML Schema.</dd>


</dl>


<h3>Members</h3>


<p>The following W3C Member organizations have appointed participants to this

Working Group (<a

href="/2000/09/dbwg/details?group=40243">details</a>

are Member-only):</p>

<ul>

  <li>AOL</li>

  <li>Deutsche Telekom AG, T-Com</li>

  <li>FOSI (until November 2008)</li>

  <li>Fundaci&oacute;n ONCE</li>

  <li>Institute of Informatics &amp; Telecommunications (IIT), NCSR</li>

  <li>National Institute of Standards and Technology (NIST)</li>

  <li>Opera Software</li>

  <li>Segala (until October 2008)</li>

  <li>Vodafone</li>

</ul>


<h3 id="join">Joining the POWDER Working Group</h3>


<p>The POWDER working group is now closed. More information <a href="/Consortium/">about the W3C</a>

is available as is information about <a href="/Consortium/join">joining W3C</a>.</p>

</div>


<div>

<h2 id="mailing">Mailing Lists &amp; Blogs</h2>

<ul>

  <li>Mailing list archives:

    <ul>

      <li><a href="http://lists.w3.org/Archives/Public/public-powderwg/"

        >public-powderwg</a> (technical discussion),</li>

      <li><a href="http://lists.w3.org/Archives/Member/member-powderwg/"

        >member-powderwg</a> (administrative, Member-only)</li>

    </ul>

  </li>

  <li>Our <a href="blog">POWDER blog</a>, updated weekly (<a href="/blog/powder?tempskin=_rdf">RSS feed</a>)</li>

</ul>

</div>


<div>

<h2 id="dependencies">Relationship with Other W3C Work</h2>


<dl>

<dt><a href="/2005/MWI/BPWG/">Mobile Web Best Practices</a></dt>

<dd>The development of the mobileOK trustmark is an important use case and

test case for description resources.</dd>


<dt><a href="/2005/rules/">Rule Interchange Format</a></dt>

<dd>POWDER has an inherent need for rules to define the scope of a description

and for when one description should be used in preference to another.

Furthermore, some applications will store user preferences as rules and it it

will be beneficial to be able to copy these user preferences between

clients. Cooperation and discussion with RIF is therefore important.</dd>


<dt><a href="/WAI/">Web Accessibility Initiative (WAI)</a></dt>

<dd>The POWDER Working Group seeks close cooperation with WAI on the labelling

of resources that meet WCAG guidelines and with the ERT WG on integration

with EARL.</dd>


<dt><a href="/2001/tag/">Technical Architecture Group</a></dt>

<dd>TAG has published a number of relevant findings and POWDER will need to

ensure conformance with these. For example the April 2006 finding on <a

href="/2001/tag/doc/mime-respect">Authoritative

Metadata</a>.</dd>


<dt><a href="/2006/07/SWD/">Semantic Web Deployment Working Group</a></dt>

<dd>POWDER will need to draw on this group's expertise and guidance,

particularly in relation to the applications of POWDER deliverables outside

Description Resources.</dd>


<dt><a href="/2007/uwa/">Ubiquitous Web Applications Working Group</a></dt>

<dd>There may be features in common between the protocol for accessing

description resources developed by POWDER and a protocol useful for

CC/PP.  The POWDER Working Group should track future work on a protocol

for <a href="/TR/CCPP-struct-vocab/">CC/PP</a>

in the Ubiquitous Web Applications Working Group

(successor to the Device Independence Working Group)

and identify any such opportunities for common features.</dd>


<dt><a href="/XML/">XML Activity</a></dt>

<dd>POWDER will need to explore non-Semantic Web technologies as alternative

approaches to meeting its aims. In particular input will be sought from the

<a href="/XML/Query/">XML Query (XQuery)</a> group on the

resource grouping Recommendation.</dd>

</dl>

</div>


<hr />

<address>

  <a href="http://philarcher.org/">Phil Archer</a>, Chair<br />

  <a href="mailto:mdw@w3.org">Matt Womer</a>, W3C/ERCIM, staff contact<br/>


  <small>$Revision: 1.71 $ of $Date: 2009/11/24 15:33:35 $</small>

</address>

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