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777 lines
41 KiB
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><!-- Generated from data/head.php, ../../smarty/{head.tpl} --><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>Semantic Web - W3C</title><link rel="Help" href="/Help/" /><link rel="stylesheet" href="/2008/site/css/minimum" type="text/css" media="handheld, all" /><style type="text/css" media="print, screen and (min-width: 481px)" xml:space="preserve">
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/**/
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@import url("/2008/site/css/advanced");
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/**/
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</style><link href="/2008/site/css/minimum" rel="stylesheet" type="text/css" media="handheld, only screen and (max-device-width: 480px)" /><meta name="viewport" content="width=device-width" /><link rel="stylesheet" href="/2008/site/css/print" type="text/css" media="print" /><link rel="shortcut icon" href="/2008/site/images/favicon.ico" type="image/x-icon" /><link rel="alternate" type="application/atom+xml" title="W3C News" href="news.xml" /></head><body id="www-w3-org" class="w3c_public"><div id="w3c_container">
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<!-- Generated from data/mast.php, ../../smarty/{mast.tpl} -->
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<div id="w3c_mast"><!-- #w3c_mast / Page top header -->
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<h1 class="logo"><a tabindex="2" accesskey="1" href="/"><img src="/2008/site/images/logo-w3c-mobile-lg" width="90" height="53" alt="W3C" /></a> <span class="alt-logo">W3C</span></h1>
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<div id="w3c_nav">
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<form action="/Help/search" method="get" enctype="application/x-www-form-urlencoded"><!-- w3c_sec_nav is populated through js --><div class="w3c_sec_nav"><!-- --></div><ul class="main_nav"><!-- Main navigation menu --><li class="first-item"><a href="/standards/">Standards</a></li><li><a href="/participate/">Participate</a></li><li><a href="/Consortium/membership">Membership</a></li><li class="last-item"><a href="/Consortium/">About W3C</a></li><li class="search-item">
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<div id="search-form"><input tabindex="3" class="text" name="q" value="" title="Search" type="text" /> <button id="search-submit" name="search-submit" type="submit"><img class="submit" src="/2008/site/images/search-button" alt="Search" width="21" height="17" /></button></div>
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</li></ul></form>
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</div>
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<!-- /end #w3c_mast -->
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<div id="w3c_main">
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<div id="w3c_logo_shadow" class="w3c_leftCol"><img width="100%" height="32" alt="" src="/2008/site/images/logo-shadow" /></div>
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<div class="w3c_leftCol"><h2 class="offscreen">Site Navigation</h2>
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<h3 class="category"><span class="ribbon"><a href="/standards/" title="Up to Standards">Standards <img src="/2008/site/images/header-link" alt="Header link" width="13" height="13" class="header-link" /></a></span></h3>
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<ul class="theme">
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<li><a href="/standards/webdesign/">Web Design and Applications</a></li>
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<li><a href="/standards/webarch/">Web Architecture</a></li>
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<li><a class="current">Semantic Web</a></li>
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<li><a href="/standards/xml/">XML Technology</a></li>
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<li><a href="/standards/webofservices/">Web of Services</a></li>
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<li><a href="/standards/webofdevices/">Web of Devices</a></li>
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<li><a href="/standards/agents/">Browsers and Authoring Tools</a></li>
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<li><a href="/TR/">All Standards and Drafts</a></li>
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<li><a href="/standards/about.html">About W3C Standards</a></li>
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</ul>
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<br /></div>
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<div class="w3c_mainCol">
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<div id="w3c_crumbs">
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<div id="w3c_crumbs_frame">
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<ul class="bct"> <!-- .bct / Breadcrumbs -->
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<li class="skip"><a tabindex="1" accesskey="2" title="Skip to content (e.g., when browsing via audio)" href="#w3c_content_body">Skip</a></li>
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<li><a href="/">W3C</a> <span class="cr">»</span> </li>
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<li><a href="/standards/">Standards</a> <span class="cr">»</span> </li>
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<li class="current">Semantic Web</li>
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</ul>
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</div>
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</div>
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<h1 class="title">
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<img src="/2008/site/images/theme-web-semantics" alt="" />Semantic Web</h1>
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<ul class="w3c_toc"><li class="toc_prefix">On this page → </li><li>
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<a href="#w3c_overview">technology topics</a>
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<span class="bullet">•</span>
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</li><li>
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<a href="#recent">news</a>
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<span class="bullet">•</span>
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</li><li>
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<a href="#upcomingevents">upcoming events and talks</a>
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</li></ul>
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<div id="w3c_content_body">
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<div class="line">
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<div class="intro">
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<p>In addition to the classic “Web of documents” W3C is helping to build
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a technology stack to support a “Web of data,” the sort of data you find in databases. The ultimate goal of the Web of data is to enable computers to do more useful work and to develop systems that can support trusted interactions over the network. The term “Semantic Web” refers to W3C’s vision of the Web of linked data. Semantic Web technologies enable people to create data stores on the Web, build vocabularies, and write rules for handling data. Linked data are empowered by technologies such as RDF, SPARQL, OWL, and SKOS.</p>
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</div>
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</div>
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<!-- Generated from data/bucket_1_on_3.php, ../../smarty/{bucket_1_on_n.tpl} -->
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<div id="w3c_overview">
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<div class="line">
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<div class="unit size1on3">
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<h2 class="w3c_topic">
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<a href="/standards/semanticweb/data">Linked Data <img src="/2008/site/images/header-link" alt="Header link" width="13" height="13" class="header-link" />
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</a>
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</h2>
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<p class="tPadding0">
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The Semantic Web is a Web of data — of dates and titles
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and part numbers and chemical properties and any other data one
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might conceive of. RDF provides the foundation for publishing
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and linking your data. Various technologies allow you to
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embed data in documents (RDFa, GRDDL) or expose what you have
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in SQL databases, or make it available as RDF files.
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</p>
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</div>
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<div class="unit size1on3">
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<h2 class="w3c_topic">
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<a href="/standards/semanticweb/ontology">Vocabularies <img src="/2008/site/images/header-link" alt="Header link" width="13" height="13" class="header-link" />
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</a>
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</h2>
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<p class="tPadding0">
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At times it may be important or valuable to organize data.
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Using OWL (to build vocabularies, or “ontologies”) and SKOS (for designing
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knowledge organization systems) it is possible to
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enrich data with additional meaning, which allows more people
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(and more machines) to do more with the data.
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</p>
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</div>
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<div class="unit size1on3 lastUnit">
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<h2 class="w3c_topic">
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<a href="/standards/semanticweb/query">Query <img src="/2008/site/images/header-link" alt="Header link" width="13" height="13" class="header-link" />
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</a>
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</h2>
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<p class="tPadding0">
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Query languages go hand-in-hand with databases.
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If the Semantic Web is viewed as a global database, then
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it is easy to understand why one would need a query language
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for that data. SPARQL is the query language for the
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Semantic Web.
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</p>
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</div>
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</div>
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<div class="line">
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<div class="unit size1on3">
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<h2 class="w3c_topic">
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<a href="/standards/semanticweb/inference">Inference <img src="/2008/site/images/header-link" alt="Header link" width="13" height="13" class="header-link" />
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</a>
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</h2>
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<p class="tPadding0">
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Near the top of the Semantic Web stack one finds inference
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— reasoning over data through rules. W3C work on rules,
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primarily through RIF and OWL, is
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focused on translating between rule languages and
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exchanging rules among different systems.
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</p>
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</div>
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<div class="unit size1on3">
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<h2 class="w3c_topic">
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<a href="/standards/semanticweb/applications">Vertical Applications <img src="/2008/site/images/header-link" alt="Header link" width="13" height="13" class="header-link" />
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</a>
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</h2>
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<p class="tPadding0">
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W3C is working with different industries — for example in
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Health Care and Life Sciences, eGovernment, and Energy — to improve collaboration,
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research and development, and innovation adoption through
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Semantic Web technology. For instance, by aiding
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decision-making in clinical research, Semantic Web
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technologies will bridge many forms of biological and
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medical information across institutions.
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</p>
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</div>
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</div>
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</div>
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<div class="line">
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<div id="recentnews" class="hierarchy hentry_list">
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<h2 id="recent">News
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<a title="Subscribe to News" href="http://www.w3.org/standards/semanticweb/news.xml" class="feedlink">
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<img width="30" height="30" alt="Atom" src="/2008/site/images/icons/atom30" />
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</a></h2>
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<div class="hentry expand_block">
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<div class="headline">
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<h3 class="tPadding0 bPadding0 entry-title">
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<span class="expand_section">
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<a class="uri url" href="http://www.w3.org/blog/SW/2012/01/12/drafts-published-by-the-w3c-html-data-task-force-html-data-guide-and-microdata-to-rdf-transform/">
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Drafts Published by the W3C HTML Data Task Force: HTML Data Guide
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and Microdata to RDF transform</a>
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</span>
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</h3>
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<p class="date">
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<abbr class="published" title="2012-01-12">12
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January 2012</abbr>
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</p>
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<p class="author vcard">from
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<a class="fn org url" href="http://www.w3.org/blog/SW">Semantic Web
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Activity News</a></p>
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</div>
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<div class="expand_description entry-content"><p>The
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<a href="http://www.w3.org/wiki/Html-data-tf">HTML Data Task
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Force</a> of the
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<a href="http://www.w3.org/2001/sw/interest/">W3C Semantic Web
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Interest Group</a>has published two documents today:</p><ul class="show_items">
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<li>The
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<a href="http://www.w3.org/TR/2012/WD-html-data-guide-20120112/">
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HTML Data Guide</a>aims to help publishers and consumers of HTML
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data. With several syntaxes (microformats, microdata, RDFa) and
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vocabularies (schema.org, Dublin Core, microformat vocabularies,
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etc.) to choose from, it provides guidance on deciding what to
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choose in a way that meets the publisher’s or consumer’s
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needs.</li>
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<li>The
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<a href="http://www.w3.org/TR/2012/WD-microdata-rdf-20120112/">
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Microdata to RDF</a>describes processing rules that may be used to
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extract RDF from an HTML document containing microdata.</li>
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</ul><p>Both documents are Working Drafts, with the goal of publishing a
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final version as Interest Group Notes. Comments and feedbacks are
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welcome; please send them to the
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<a href="mailto:public-html-data-tf@w3.org">
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public-html-data-tf@w3.org</a>mailing list.</p></div>
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</div>
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<div class="hentry closed expand_block">
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<div class="headline">
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<h3 class="tPadding0 bPadding0 entry-title">
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<span class="expand_section">
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<a class="uri url" href="http://www.w3.org/blog/SW/2012/01/11/feedback-welcome-an-overview-of-the-provenance-prov-family-of-specs/">
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Feedback Welcome: An Overview of the Provenance (PROV) family of
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specs</a>
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</span>
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</h3>
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<p class="date">
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<abbr class="published" title="2012-01-11">11
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January 2012</abbr>
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</p>
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<p class="author vcard">from
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<a class="fn org url" href="http://www.w3.org/blog/SW">Semantic Web
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Activity News</a></p>
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</div>
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<div class="expand_description entry-content"><p>Knowing how, where, when and why content was produced is an
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important part of making a trustworthy web. However, it is often
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difficult to interchange this provenance information between
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systems. For example, it’s often difficult to locate or find
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provenance information for a web page. Even if the provenance
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information is located, it is often only available as text or if it
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is available in a structured way it does not use a common
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terminology — making it difficult to create software that can
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leverage this information.</p><p>The
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<a href="http://www.w3.org/2011/prov/wiki/Main_Page">Provenance
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Working Group</a>was charted to help address these limitations. The
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group has been working diligently to create a family of
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specifications (called PROV) that allow for the interchange of
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provenance. The group is looking for your feedback. This post
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provides an overview of the various working drafts that have been
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published and should help you find your way around.</p><p>The set of specs at this point addresses two aspects of
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provenance interoperability introduced above:</p><ul class="show_items">
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<li>provenance access</li>
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<li>provenance representation</li>
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</ul><p>
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<a href="http://www.w3.org/TR/prov-aq/">PROV-AQ: Provenance Access
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and Query</a>addresses how to both make available and retrieve
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provenance information for Web resources. The document specifies
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how to use existing Web technologies such as HTTP, link headers,
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and SPARQL to accomplish this. Where possible the specification
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attempts to be agnostic the format of the provenance being
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accessed.</p><p>Once some provenance is obtained, it is important for the
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information to be understandable in a machine interpretable
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fashion. The Working Group has defined a data model (
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<a href="http://www.w3.org/TR/prov-dm/">PROV-DM</a> ) that provides
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facilities for representing the entities, people and activities
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involved in producing a piece of data or thing in the world. The
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data model is domain-agnostic and has well defined extensibility
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points. Importantly, the data model has a corresponding OWL
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ontology (
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<a href="http://www.w3.org/TR/prov-o/">PROV-O</a>) that encodes the
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PROV-DM. PROV-O is envisioned to specify the serialization for
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exchanging provenance information.</p><p>To help orient users of PROV-O and PROV-DM, the working group
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has developed a primer (
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<a href="http://www.w3.org/TR/prov-primer/">PROV-Primer</a>) that
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introduces the core constructs of the data model and provides
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examples using PROV-O. It is recommended that users and reviewers
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of the specification begin with the primer before moving to the
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ontology or data model.</p><p>The group is looking for feedback of all types: Would you expose
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provenance using PROV-AQ? Can you represent your provenance
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information using the PROV-O data model? Does PROV-O integrate well
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with your Linked Data or other Semantic Web infrastructure?</p><p>Let us know what you think.</p><p>The PROV family of specifications:</p><ul class="show_items">
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<li>prov-aq:
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<a href="http://www.w3.org/TR/prov-aq/">
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http://www.w3.org/TR/prov-aq/</a></li>
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<li>prov-dm:
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<a href="http://www.w3.org/TR/prov-dm/">
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http://www.w3.org/TR/prov-dm/</a></li>
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<li>prov-o:
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<a href="http://www.w3.org/TR/prov-o/">
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http://www.w3.org/TR/prov-o/</a></li>
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<li>prov-primer:
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<a href="http://www.w3.org/TR/prov-primer/">
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http://www.w3.org/TR/prov-primer/</a></li>
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</ul><div class="lMargin"><p>Paul Groth and Luc Moreau on behalf of the PROV-WG</p></div></div>
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</div>
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<div class="hentry closed expand_block">
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<div class="headline">
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<h3 class="tPadding0 bPadding0 entry-title">
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<span class="expand_section">
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<a class="uri url" href="http://www.w3.org/blog/SW/2012/01/10/provenance-access-and-query-and-provenance-primer-documents-published/">
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Provenance Access and Query and Provenance Primer Documents
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published</a>
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</span>
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</h3>
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<p class="date">
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<abbr class="published" title="2012-01-10">10
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January 2012</abbr>
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</p>
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<p class="author vcard">from
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<a class="fn org url" href="http://www.w3.org/blog/SW">Semantic Web
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Activity News</a></p>
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</div>
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<div class="expand_description entry-content"><p>The
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<a href="http://www.w3.org/2011/prov">W3C Provenance Working
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Group</a>has published two new documents:</p><ul class="show_items">
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<li>The
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<a href="http://www.w3.org/TR/2012/WD-prov-aq-20120110/">
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“Provenance Access and Query”</a> document specifies how to use
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standard Web protocols, including HTTP, to obtain information about
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the
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<a class="zem_slink" title="Provenance" href="http://en.wikipedia.org/wiki/Provenance">provenance</a>of Web
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resources.</li>
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<li>The
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<a href="http://www.w3.org/TR/2012/WD-prov-primer-20120110/">
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“Provenance Primer”</a>provides an intuitive introduction and guide
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to the PROV data model for provenance</li>
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</ul><p>Both documents are First Public Working Drafts; feedbacks and
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comments are welcome! Please, use the
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<a href="mailto:public-prov-comments@w3.org">
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<code>public-prov-comments@w3.org</code>
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</a>mailing list to provide your comments.</p><div class="zemanta-pixie lMargin"><p>
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<img class="zemanta-pixie-img" src="http://img.zemanta.com/pixy.gif?x-id=797d5232-6df8-43b7-837d-fb27bad4b58f" alt="" />
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</p></div></div>
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</div>
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<div class="hentry closed expand_block">
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<div class="headline">
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<h3 class="tPadding0 bPadding0 entry-title">
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<span class="expand_section">
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<a class="uri url" href="http://www.w3.org/blog/SW/2012/01/06/publication-of-the-sparql-1-1-2nd-last-call-working-drafts/">
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Publication of the SPARQL 1.1 2nd Last Call Working Drafts</a>
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</span>
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</h3>
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<p class="date">
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<abbr class="published" title="2012-01-06">06
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January 2012</abbr>
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</p>
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<p class="author vcard">from
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<a class="fn org url" href="http://www.w3.org/blog/SW">Semantic Web
|
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Activity News</a></p>
|
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</div>
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<div class="expand_description entry-content"><p>The W3C
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<a href="http://www.w3.org/2009/sparql/wiki/Main_Page">SPARQL
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Working Group</a>has published the (second) Last Call Working
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Drafts of the following SPARQL 1.1 documents:</p><ul class="show_items">
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<li>
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<a href="http://www.w3.org/TR/2012/WD-sparql11-update-20120105/">
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SPARQL 1.1 Update</a>defines an update language for RDF
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graphs.</li>
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<li>
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<a href="http://www.w3.org/TR/2012/WD-sparql11-service-description-20120105/">
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SPARQL 1.1 Service Description</a>defines a vocabulary and
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discovery mechanism for describing the capabilities of a SPARQL
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endpoint.</li>
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<li>
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<a href="http://www.w3.org/TR/2012/WD-sparql11-query-20120105/">
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SPARQL 1.1 Query Language</a>adds support for aggregates,
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subqueries, projected expressions, and negation to the SPARQL query
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language.</li>
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<li>
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<a href="http://www.w3.org/TR/2012/WD-sparql11-protocol-20120105/">
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SPARQL 1.1 Protocol</a>describes a means for conveying SPARQL
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queries and updates to a SPARQL processing service and returning
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the results via HTTP to the entity that requested them.</li>
|
|
<li>
|
|
<a href="http://www.w3.org/TR/2012/WD-sparql11-entailment-20120105/">
|
|
SPARQL 1.1 Entailment Regimes</a>defines conditions under which
|
|
SPARQL queries can be used with entailment regimes such as RDF, RDF
|
|
Schema, OWL, or RIF.</li>
|
|
</ul><p>Review comments are welcome through 6 February; please use the
|
|
dedicated mailing list:
|
|
<a href="mailto:public-sparql-dev@w3.org">
|
|
public-sparql-dev@w3.org</a>.</p></div>
|
|
</div>
|
|
<div class="hentry closed expand_block">
|
|
<div class="headline">
|
|
<h3 class="tPadding0 bPadding0 entry-title">
|
|
<span class="expand_section">
|
|
<a class="uri url" href="http://ivan-herman.name/2011/12/16/where-we-are-with-rdfa-1-1/">
|
|
Where we are with RDFa 1.1?</a>
|
|
</span>
|
|
</h3>
|
|
<p class="date">
|
|
<abbr class="published" title="2011-12-16">16
|
|
December 2011</abbr>
|
|
</p>
|
|
<p class="author vcard">from
|
|
<a class="fn org url" href="http://ivan-herman.name">Ivan’s private
|
|
site » Work Related</a></p>
|
|
</div>
|
|
<div class="expand_description entry-content"><div class="mceTemp lMargin"><div class="wp-caption alignright lMargin"><p>
|
|
<a href="http://commons.wikipedia.org/wiki/File:Rdface.gif">
|
|
<img class="zemanta-img-inserted zemanta-img-configured" title="English: RDFa Content Editor" src="http://upload.wikimedia.org/wikipedia/commons/4/48/Rdface.gif" alt="English: RDFa Content Editor" width="120" height="120" />
|
|
</a>
|
|
</p><p class="wp-caption-text">Image via Wikipedia</p></div></div><p>There has been a flurry of activities around RDFa 1.1 in the
|
|
past few months. Although a number of blogs and news items have
|
|
been published on the changes, all those have become “officialized”
|
|
only the past few days with the
|
|
<a href="http://www.w3.org/blog/SW/2011/12/16/new-versions-of-rdfa-core-1-1-and-the-xhtmlrdfa-1-1-drafts/">
|
|
publication of the latest drafts</a> , as well as with the
|
|
<a href="http://www.w3.org/blog/SW/2011/12/09/rdfa-lite-1-1-draft-published-rdfa-1-1-primer-updated/">
|
|
publication of RDFa 1.1 Lite</a>. It may be worth looking back at
|
|
the past few months to have a clearer idea on what happened. I make
|
|
references to a number of other blogs that were published in the
|
|
past few months; the interested readers should consult those for
|
|
details.</p><p>The latest official drafts for RDFa 1.1 were published in Spring
|
|
2011. However, lot has happened since. First of all, the
|
|
<a href="http://www.w3.org/2010/02/rdfa/wiki/Main_Page">RDFWA
|
|
Working Group</a> , working on this specification, has received a
|
|
significant amount of comments. Some of those were rooted in
|
|
implementations and the difficulties encountered therein; some came
|
|
from potential authors who asked for further simplifications. Also,
|
|
the announcement of
|
|
<a href="http://schema.org">schema.org</a> had an important effect:
|
|
indeed, this initiative drew attention on the importance of
|
|
structured data in Web pages, which also raised further questions
|
|
on the usability of RDFa for that usage pattern This came to the
|
|
fore even more forcefully at the
|
|
<a href="http://www.w3.org/QA/2011/09/impressions_on_the_schemaorg_w.html">
|
|
workshop organized by the stakeholders of schema.org</a> in Mountain
|
|
View. A new
|
|
<a href="http://www.w3.org/wiki/Html-data-tf">task force on the
|
|
relationships of RDFa and microdata</a>has been set up at W3C;
|
|
beyond looking at the relationship of these two syntaxes, that task
|
|
force also raised a number of issues on RDFa 1.1. These issues have
|
|
been, by and large, accepted and handled by the Working Group (and
|
|
reflected in the new drafts).</p><p>What does this mean for the new drafts? The bottom line: there
|
|
have been some fundamental changes in RDFa 1.1. For example,
|
|
profiles, introduced in earlier releases of RDFa 1.1, have been
|
|
removed due to implementation challenges; however, management of
|
|
vocabularies have acquired an
|
|
<em>optional</em>feature that helps vocabulary authors to “bind”
|
|
their vocabularies to other vocabularies, without introducing an
|
|
extra burden on authors (see
|
|
<a href="http://www.w3.org/blog/SW/2011/09/19/recent-changes-in-rdfa-1-1/">
|
|
another blog</a> for more details). Another long-standing issue was
|
|
whether RDFa should include a syntax for ordered lists; this has
|
|
been done now (see the
|
|
<a href="http://www.w3.org/blog/SW/2011/09/19/recent-changes-in-rdfa-1-1/">
|
|
same blog</a>for further details).</p><p>A more recent important change concerns the usage of
|
|
<code>@property</code>and
|
|
<code>@rel</code>. Although usage of these attributes for RDF savy
|
|
authors was never a real problem (the former is for the creation of
|
|
literal objects, whereas the latter is for URI references), they
|
|
have proven to be a major obstacle for ‘lambda’ HTML authors. This
|
|
issue came up quite forcefully at the schema.org workshop in
|
|
Mountain View, too. After a long technical discussion in the group,
|
|
the new version reduces the usage difference between the two
|
|
significantly. Essentially, if, on the same element,
|
|
<code>@property</code>is present together with, say,
|
|
<code>@href</code>or
|
|
<code>@resource</code>, and
|
|
<code>@rel</code>or
|
|
<code>@rev</code>is
|
|
<em>not</em>present, a URI reference is generated as an object of
|
|
the triple. I.e., when used on a, say,
|
|
<code><link></code>or
|
|
<code><a></code>element,
|
|
<code>@property</code>  behaves exactly like
|
|
<code>@rel</code>. It turns out that this usage pattern is so
|
|
widespread that it covers most of the important use cases for
|
|
authors. The new version of the
|
|
<a href="http://www.w3.org/TR/rdfa-primer/">RDFa 1.1 Primer</a> (as
|
|
well as the
|
|
<a href="http://www.w3.org/TR/2011/WD-rdfa-core-20111215/">RDFa 1.1
|
|
Core</a>, actually) has a number of examples that show these. There
|
|
are also some other changes related to the behaviour of
|
|
<code>@typeof</code>in relations to
|
|
<code>@property</code>; please consult the specification for
|
|
these.</p><p>The publication of
|
|
<a href="http://www.w3.org/TR/rdfa-lite/">RDFa 1.1 Lite</a> was also
|
|
a very important step. This defines a “sub-set” of the RDFa
|
|
attributes that can serve as a guideline for HTML authors to
|
|
express simple structured data in HTML without bothering about more
|
|
complex features. This is the subset of RDFa that
|
|
<a href="http://blog.schema.org/2011/11/using-rdfa-11-lite-with-schemaorg.html">
|
|
schema.org will “accept”,</a>   as an alternative to the
|
|
<a href="http://dev.w3.org/html5/md/">microdata</a> , as a possible
|
|
syntax for schema.org vocabularies. (There are some examples on how
|
|
some schema.org example look like in RDFa 1.1 Lite on a
|
|
<a href="http://www.w3.org/QA/2011/11/schemaorg_and_rdfa_11_lite_how.html">
|
|
different blog</a> .) In some sense, RDFa 1.1 Lite can be considered
|
|
like the equivalent of microdata, except that it leaves the door
|
|
open for more complex vocabulary usage, mixture with different
|
|
vocabularies, etc. (The
|
|
<a href="http://www.w3.org/wiki/Html-data-tf">HTML Task
|
|
Force</a>will publish soon a more detailed comparison of the
|
|
different syntaxes.)</p><p>So here is, roughly, where we are today. The recent publications
|
|
by the W3C RDFWA Working Group have, as I said, ”officialized” all
|
|
the changes that were discussed since spring. The group decided not
|
|
to publish a Last Call Working Draft, because the last few weeks’
|
|
of work on the
|
|
<a href="http://www.w3.org/wiki/Html-data-tf">HTML Task
|
|
Force</a>may reveal some new requirements; if not, the last round
|
|
of publications will follow soon.</p><p>And what about implementations? Well,
|
|
<a href="http://www.w3.org/2007/08/pyRdfa/Shadow.html">my “shadow”
|
|
implementation of the RDFa distiller</a> (which also includes a
|
|
separate “
|
|
<a href="http://www.w3.org/2007/08/pyRdfa/Validator.html">
|
|
validator</a> ” service) incorporates all the latest changes. I also
|
|
added a new feature a few weeks ago, namely the possibility to
|
|
<a href="http://www.w3.org/QA/2011/11/rdfa_11_meets_json-ld_in_the_d.html">
|
|
serialize the output in JSON-LD</a> (although this has become
|
|
outdated a few days ago, due to some
|
|
<a href="http://json-ld.org/minutes/2011-12-13/">changes in
|
|
JSON-LD</a> …). I am not sure of the exact status of Gregg Kellogg’s
|
|
|
|
<a href="http://rdf.greggkellogg.net/distiller">RDF Distiller</a>,
|
|
but, knowing him, it is either already in line with the latest
|
|
drafts or it is only a matter of a few days to be so. And there are
|
|
surely more around that I do not know about.</p><p>This last series of publications have provided a nice closure
|
|
for a busy RDFa year. I guess the only thing now is to wish
|
|
everyone a Merry Christmas, a peaceful and happy Hanukkah, or other
|
|
festivities you honor at this time of the year.  In any case,
|
|
a very happy New Year!</p><div class="zemanta-pixie lMargin"><p>
|
|
<a class="zemanta-pixie-a" title="Enhanced by Zemanta" href="http://www.zemanta.com/">
|
|
<img class="zemanta-pixie-img" src="http://img.zemanta.com/zemified_e.png?x-id=374ecad3-7da1-4de6-a4f1-d8d92bb1ba64" alt="Enhanced by Zemanta" />
|
|
</a>
|
|
</p></div><p>
|
|
<br />Filed under:
|
|
<a href="http://ivan-herman.name/category/work-related/code/python/">
|
|
Python</a> ,
|
|
<a href="http://ivan-herman.name/category/work-related/semantic-web/">
|
|
Semantic Web</a> ,
|
|
<a href="http://ivan-herman.name/category/work-related/">Work
|
|
Related</a> Tagged:
|
|
<a href="http://ivan-herman.name/tag/html/">HTML</a> ,
|
|
<a href="http://ivan-herman.name/tag/html5/">HTML5</a> ,
|
|
<a href="http://ivan-herman.name/tag/json/">JSON</a> ,
|
|
<a href="http://ivan-herman.name/tag/rdfa/">RDFa</a> ,
|
|
<a href="http://ivan-herman.name/tag/rdfa-1-1-lite/">RDFa 1.1
|
|
Lite</a> ,
|
|
<a href="http://ivan-herman.name/tag/resource-description-framework/">
|
|
Resource Description Framework</a> ,
|
|
<a href="http://ivan-herman.name/tag/schema-org/">schema.org</a>
|
|
<a href="http://feeds.wordpress.com/1.0/gocomments/ivanherman.wordpress.com/809/">
|
|
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<img alt="" src="http://feeds.wordpress.com/1.0/comments/ivanherman.wordpress.com/809/" />
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</a>
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<a href="http://feeds.wordpress.com/1.0/godelicious/ivanherman.wordpress.com/809/">
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<img alt="" src="http://feeds.wordpress.com/1.0/delicious/ivanherman.wordpress.com/809/" />
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</a>
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<a href="http://feeds.wordpress.com/1.0/gofacebook/ivanherman.wordpress.com/809/">
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<img alt="" src="http://feeds.wordpress.com/1.0/facebook/ivanherman.wordpress.com/809/" />
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</a>
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<a href="http://feeds.wordpress.com/1.0/gotwitter/ivanherman.wordpress.com/809/">
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<img alt="" src="http://feeds.wordpress.com/1.0/twitter/ivanherman.wordpress.com/809/" />
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</a>
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<a href="http://feeds.wordpress.com/1.0/gostumble/ivanherman.wordpress.com/809/">
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<img alt="" src="http://feeds.wordpress.com/1.0/stumble/ivanherman.wordpress.com/809/" />
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</a>
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<a href="http://feeds.wordpress.com/1.0/godigg/ivanherman.wordpress.com/809/">
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|
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<img alt="" src="http://feeds.wordpress.com/1.0/digg/ivanherman.wordpress.com/809/" />
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</a>
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<a href="http://feeds.wordpress.com/1.0/goreddit/ivanherman.wordpress.com/809/">
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|
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<img alt="" src="http://feeds.wordpress.com/1.0/reddit/ivanherman.wordpress.com/809/" />
|
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</a>
|
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<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=ivan-herman.name&blog=557157&post=809&subd=ivanherman&ref=&feed=1" width="1" height="1" /></p></div>
|
|
</div>
|
|
<div class="hentry closed expand_block">
|
|
<div class="headline">
|
|
<h3 class="tPadding0 bPadding0 entry-title">
|
|
<span class="expand_section">
|
|
<a class="uri url" href="http://www.w3.org/blog/SW/2011/12/16/new-versions-of-rdfa-core-1-1-and-the-xhtmlrdfa-1-1-drafts/">
|
|
New Versions of RDFa Core 1.1 and the XHTML+RDFa 1.1 Drafts</a>
|
|
</span>
|
|
</h3>
|
|
<p class="date">
|
|
<abbr class="published" title="2011-12-16">16
|
|
December 2011</abbr>
|
|
</p>
|
|
<p class="author vcard">from
|
|
<a class="fn org url" href="http://www.w3.org/blog/SW">Semantic Web
|
|
Activity News</a></p>
|
|
</div>
|
|
<div class="expand_description entry-content"><p>The
|
|
<a href="http://www.w3.org/2010/02/rdfa/">RDF Web Applications
|
|
Working Group</a> has published a Working Draft of
|
|
<a href="http://www.w3.org/TR/2011/WD-rdfa-core-20111215/">RDFa
|
|
Core 1.1</a> , a specification for attributes to express structured
|
|
data in any markup language. The group also published an update to
|
|
<a href="http://www.w3.org/TR/2011/WD-xhtml-rdfa-20111215/">
|
|
XHTML+RDFa 1.1</a>, a Host Language for RDFa Core 1.1. This
|
|
document is intended for authors who want to create XHTML Family
|
|
documents that embed rich semantic markup.</p><div class="zemanta-pixie lMargin"><p>
|
|
<a class="zemanta-pixie-a" title="Enhanced by Zemanta" href="http://www.zemanta.com/">
|
|
<img class="zemanta-pixie-img" src="http://img.zemanta.com/zemified_e.png?x-id=5050aaea-e7e5-4d34-a26e-22f990f98f1c" alt="Enhanced by Zemanta" />
|
|
</a>
|
|
</p></div></div>
|
|
</div>
|
|
<div class="hentry closed expand_block">
|
|
<div class="headline">
|
|
<h3 class="tPadding0 bPadding0 entry-title">
|
|
<span class="expand_section">
|
|
<a class="uri url" href="http://www.w3.org/blog/SW/2011/12/16/new-version-of-the-prov-data-model-draft/">
|
|
New Version of the PROV Data Model Draft</a>
|
|
</span>
|
|
</h3>
|
|
<p class="date">
|
|
<abbr class="published" title="2011-12-16">16
|
|
December 2011</abbr>
|
|
</p>
|
|
<p class="author vcard">from
|
|
<a class="fn org url" href="http://www.w3.org/blog/SW">Semantic Web
|
|
Activity News</a></p>
|
|
</div>
|
|
<div class="expand_description entry-content"><p>The
|
|
<a href="http://www.w3.org/2011/prov/">Provenance Working
|
|
Group</a> has published a new Working Draft of
|
|
<a href="http://www.w3.org/TR/2011/WD-prov-dm-20111215/">The PROV
|
|
Data Model and Abstract Syntax Notation</a> . Provenance of
|
|
information is crucial in deciding whether information is to be
|
|
trusted, how it should be integrated with other diverse information
|
|
sources, and how to give credit to its originators when reusing it.
|
|
In an open and inclusive environment such as the Web, users find
|
|
information that is often contradictory or questionable:
|
|
<a class="zem_slink" title="Provenance" href="http://en.wikipedia.org/wiki/Provenance">provenance</a> can
|
|
help those users to make trust judgments. PROV-DM is a
|
|
<a class="zem_slink" title="Data model" href="http://en.wikipedia.org/wiki/Data_model">data model</a>for
|
|
provenance for building representations of the entities, people and
|
|
activities involved in producing a piece of data or thing in the
|
|
world.</p><div class="zemanta-pixie lMargin"><p>
|
|
<a class="zemanta-pixie-a" title="Enhanced by Zemanta" href="http://www.zemanta.com/">
|
|
<img class="zemanta-pixie-img" src="http://img.zemanta.com/zemified_e.png?x-id=ae5feb7d-3daf-47b8-a892-ef1162962794" alt="Enhanced by Zemanta" />
|
|
</a>
|
|
</p></div></div>
|
|
</div>
|
|
<div class="hentry closed expand_block">
|
|
<div class="headline">
|
|
<h3 class="tPadding0 bPadding0 entry-title">
|
|
<span class="expand_section">
|
|
<a class="uri url" href="http://www.w3.org/blog/SW/2011/12/13/first-public-working-draft-of-the-prov-ontology-published/">
|
|
First Public Working Draft of the PROV Ontology published</a>
|
|
</span>
|
|
</h3>
|
|
<p class="date">
|
|
<abbr class="published" title="2011-12-13">13
|
|
December 2011</abbr>
|
|
</p>
|
|
<p class="author vcard">from
|
|
<a class="fn org url" href="http://www.w3.org/blog/SW">Semantic Web
|
|
Activity News</a></p>
|
|
</div>
|
|
<div class="expand_description entry-content"><p>The W3C
|
|
<a href="http://www.w3.org/2011/prov/">Provenance Working
|
|
Group</a> has published the First Public Working Draft of
|
|
<a href="http://www.w3.org/TR/2011/WD-prov-o-20111213/">The PROV
|
|
Ontology: Model and Formal Semantics</a> . The PROV Ontology (also
|
|
known as PROV-O) encodes the
|
|
<a href="http://www.w3.org/TR/2011/WD-prov-dm-20111018/">PROV Data
|
|
Model</a>in the OWL2 Web Ontology Language (OWL2). The PROV
|
|
ontology consists of a set of classes, properties, and restrictions
|
|
that can be used to represent provenance information. The PROV
|
|
ontology can also be specialized to create new classes and
|
|
properties for modeling provenance information specific to
|
|
different domain applications. The PROV ontology supports a set of
|
|
entailments based on OWL2 formal semantics and provenance specific
|
|
inference rules. The PROV ontology is available for download as a
|
|
separate OWL2 document.</p><div class="zemanta-pixie lMargin"><p>
|
|
<a class="zemanta-pixie-a" title="Enhanced by Zemanta" href="http://www.zemanta.com/">
|
|
<img class="zemanta-pixie-img" src="http://img.zemanta.com/zemified_e.png?x-id=492b8d17-823b-4d59-8d02-d405e211141d" alt="Enhanced by Zemanta" />
|
|
</a>
|
|
</p></div></div>
|
|
</div>
|
|
<div class="hentry closed expand_block">
|
|
<div class="headline">
|
|
<h3 class="tPadding0 bPadding0 entry-title">
|
|
<span class="expand_section">
|
|
<a class="uri url" href="http://www.w3.org/blog/International/2011/12/09/w3c-workshop-call-for-participation-the-multilingual-web-%e2%80%93-the-way-ahead/">
|
|
W3C Workshop, Call for Participation: The Multilingual Web – The
|
|
Way Ahead</a>
|
|
</span>
|
|
</h3>
|
|
<p class="date">
|
|
<abbr class="published" title="2011-12-09">09
|
|
December 2011</abbr>
|
|
</p>
|
|
<p class="author vcard">from
|
|
<a class="fn org url" href="http://www.w3.org/blog/International">
|
|
Internationalization Activity Blog » w3cSemanticWeb</a></p>
|
|
</div>
|
|
<div class="expand_description entry-content"><div class="lMargin"><p>
|
|
<img src="http://www.w3.org/International/multilingualweb/images/mlw-logo.png" alt=" " />
|
|
</p></div><p>
|
|
<strong>15 – 16 March 2012, Luxembourg</strong>. Co-located with
|
|
the European Commission’s Language Technology Showcase Days, and
|
|
hosted by the Directorate-General for Translation (DGT) of the
|
|
European Commission.</p><p>The
|
|
<a href="http://www.multilingualweb.eu/">MultilingualWeb
|
|
project</a>is looking at best practices and standards related to
|
|
all aspects of creating, localizing and deploying the Web
|
|
multilingually. The project aims to raise the visibility of
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existing best practices and standards and identify gaps. The core
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vehicle for this is a series of four events which are planned over
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two years.</p><p>After three highly successful workshops in Madrid, Pisa, and
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Limerick, this final workshop in the series will continue to
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investigate currently available best practices and standards aimed
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at helping content creators, localizers, tools developers, and
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others meet the challenges of the multilingual Web.</p><p>Participation is free. We welcome participation from both
|
|
speakers and non-speaking attendees. For more information, see the
|
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<a href="http://www.multilingualweb.eu/register">Call for
|
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Participation</a></p></div>
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</div>
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<div class="hentry closed expand_block">
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<div class="headline">
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<h3 class="tPadding0 bPadding0 entry-title">
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<span class="expand_section">
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<a class="uri url" href="http://www.w3.org/blog/SW/2011/12/09/rdfa-lite-1-1-draft-published-rdfa-1-1-primer-updated/">
|
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RDFa Lite 1.1 Draft Published; RDFa 1.1 Primer Updated</a>
|
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</span>
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</h3>
|
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<p class="date">
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<abbr class="published" title="2011-12-09">09
|
|
December 2011</abbr>
|
|
</p>
|
|
<p class="author vcard">from
|
|
<a class="fn org url" href="http://www.w3.org/blog/SW">Semantic Web
|
|
Activity News</a></p>
|
|
</div>
|
|
<div class="expand_description entry-content"><p>The
|
|
<a href="http://www.w3.org/2010/02/rdfa/">RDF Web Applications
|
|
Working Group</a> has published the First Public Working Draft for
|
|
<a href="http://www.w3.org/TR/rdfa-lite/">RDFa Lite 1.1</a> and an
|
|
updated Working Draft for the
|
|
<a href="http://www.w3.org/TR/rdfa-primer/">RDFa 1.1
|
|
Primer</a>.</p><p>One critique of RDFa is that is has too much functionality,
|
|
leaving first-time authors confused about the more advanced
|
|
features. RDFa Lite is a minimalist version of RDFa that helps
|
|
authors easily jump into the structured data world. The goal was to
|
|
outline a small subset of RDFa that will work for 80% of the Web
|
|
authors out there doing simple data markup.</p><p>The RDFa Primer is a more in-depth introduction to RDFa and all
|
|
of the structured data markup features that it provides.</p><div class="zemanta-pixie lMargin"><p>
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<a class="zemanta-pixie-a" title="Enhanced by Zemanta" href="http://www.zemanta.com/">
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<img class="zemanta-pixie-img" src="http://img.zemanta.com/zemified_e.png?x-id=60c09b74-6eec-456b-95bb-c550d84cdd34" alt="Enhanced by Zemanta" />
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</a>
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</p></div></div>
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<div class="w3c_events_talks">
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<div class="unit size1on2">
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<div id="upcomingtalks" class="w3c_upcoming_talks"><h2 class="category"><a title="More Talks…" href="/2007/11/Talks/Semantic_Web.html">
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Talks and Appearances
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<img src="/2008/site/images/header-link" alt="Header link" width="13" height="13" class="header-link" /></a></h2><ul class="vevent_list"><li class="vevent"><p class="date single"><span class="dtstart"><span class="year">2012</span><span class="mm-dd">-04-17</span></span> <span class="paren">(</span><span class="dd-mmm">17 APR</span><span class="paren">)</span></p><div class="info-wrap"><p class="summary">Open Data in Practice</p><p class="eventtitle"><a href="http://www.w3.org/2012/04/tuto-track.html" class="uri">W3C Tutorial Track, 21st International World Wide Web Conference (WWW2012)</a></p><p class="location">Lyon,
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France</p></div></li></ul><p>See also the <a href="/Talks/">full list of W3C Talks and Appearances</a>.</p></div>
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Events
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<p>None. See <a href="/participate/eventscal.html">full list of W3C Events</a>.</p>
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