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286 lines
7.8 KiB
286 lines
7.8 KiB
<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta name="generator"
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content="HTML Tidy for Mac OS X (vers 1st September 2004), see www.w3.org" />
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<meta http-equiv="Content-Type"
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content="text/html; charset=us-ascii" />
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<title>Semantic Web Advanced Development for Europe
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(SWAD-Europe)</title>
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<link href="http://www.w3.org/2001/sw/Europe/style/swad-europe-showcase.css"
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rel="stylesheet" type="text/css" />
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<style type="text/css">/*
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<![CDATA[*/
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body {
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font-family: verdana, helvetica, arial, sans-serif;
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}
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#leftcontent {
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position: absolute;
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left:10px;
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top:20px;
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width:200px;
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margin-right:15px;
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padding-bottom:20px;
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}
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#rightcontent {
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position: absolute;
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left:250px;
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background:#fff;
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#mainMenu {
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background-color: #EEE;
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border: 1px solid #CCC;
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#menuList {
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padding: 10px 0px 10px 15px;
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li.menubar {
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list-style: none outside;
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.menu {
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margin-left: 15px;
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padding: 0px;
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.menu li {
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background: url(http://www.w3.org/2001/sw/Europe/showcase/square.gif) no-repeat 0em 0.3em;
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list-style: none outside;
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a.actuator {
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text-decoration: none;
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}
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.menu li a {
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background-color: transparent;
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color: #000;
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font-size: 12px;
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padding-left: 15px;
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span.key {
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text-decoration: underline;
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}
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/*]]>
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*/</style>
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</head>
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<body>
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<div id="leftcontent" valign="top">
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<div align="center" valign="top">
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<a href="http://www.w3.org/2001/sw/Europe">
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<img alt="SWAD-Europe"
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src="http://www.w3.org/2001/sw/Europe/images/swade100.gif"
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height="75" border="0" /></a>
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<a href="http://www.cordis.lu/ist/">
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<img src="http://www.w3.org/2001/sw/Europe/images/istlogo-thumb.gif"
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alt="EU IST logo" height="75" border="0" /></a>
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</div>
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<div id="mainMenu">
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<ul id="menuList">
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<li class="nonexpandingmenubar">
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<a href="http://www.w3.org/2001/sw/Europe/" id="introMenu"
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name="introMenu">Introduction</a>
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</li>
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<li class="menubar">
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<a id="demosMenuActuator" class="actuator" accesskey="d"
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name="demosMenuActuator">Demonstrators</a>
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<ul id="demosMenu" class="menu">
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<li>
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<a href="http://www.w3.org/2001/sw/Europe/showcase/sem-blog.html">
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Semantic Blogging</a>
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</li>
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<li>
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<a href="http://www.w3.org/2001/sw/Europe/showcase/sem-portal.html">
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Semantic Portals</a>
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</li>
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<li>
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<a href="http://www.w3.org/2001/sw/Europe/showcase/sem-thes.html">
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Thesaurus Browser</a>
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</li>
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<li>
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<a href="http://www.w3.org/2001/sw/Europe/showcase/sem-large.html">
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Scale Demonstrator</a>
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</li>
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</ul>
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</li>
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<li class="menubar">
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<a id="themesMenuActuator" class="actuator" accesskey="t"
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name="themesMenuActuator">Themes</a>
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<ul id="themesMenu" class="menu">
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<li>
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<a href="http://www.w3.org/2001/sw/Europe/showcase/gs.html">Getting
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Started</a>
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</li>
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<li>
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<a href="http://www.w3.org/2001/sw/Europe/reports/tools/">Tools</a>
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</li>
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<li>
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<a href="http://www.w3.org/2001/sw/Europe/showcase/digital-libraries.html">
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Digital Libraries</a>
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</li>
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<li>
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<a href="http://www.w3.org/2001/sw/Europe/showcase/business-integration.html">
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Business Integration</a>
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</li>
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<li>
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<a href="http://www.w3.org/2001/sw/Europe/showcase/images.html">
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Image Description</a>
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</li>
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<li>
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<a href="http://www.w3.org/2001/sw/Europe/reports/community/">
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Community Building</a>
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</li>
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<li>
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<a href="http://www.w3.org/2001/sw/Europe/showcase/history.html">
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Project History</a>
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</li>
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<li>
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<a href="http://www.w3.org/2001/sw/Europe/showcase/future.html">
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Future Directions</a>
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</li>
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</ul>
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</li>
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<li class="menubar">
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<a id="guideMenuActuator" class="actuator" accesskey="g"
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name="guideMenuActuator">Guidelines</a>
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<ul id="guideMenu" class="menu">
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<!--<li><a href="blank.html">Aerospace</a> stilo*</li>-->
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<li>
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<a href="http://www.w3.org/2001/sw/Europe/showcase/lifesci.html">
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Life Science</a>
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</li>
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<li>
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<a href="http://www.w3.org/2001/sw/Europe/showcase/guide-for-librarian.html">
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Librarian</a>
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</li>
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<li>
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<a href="http://www.w3.org/2001/sw/Europe/showcase/coder.html">
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Coder</a>
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</li>
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<li>
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<a href="http://www.w3.org/2001/sw/Europe/showcase/business-guidelines.html">
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Business Integration</a>
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</li>
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<li>
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<a href="http://www.w3.org/2001/sw/Europe/showcase/heritage.html">
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Heritage</a>
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</li>
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</ul>
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</li>
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<li class="menubar">
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<a id="resourcesMenuActuator" class="actuator" accesskey="r"
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name="resourcesMenuActuator">Resources</a>
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<ul id="resourcesMenu" class="menu">
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<li>
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<a href="http://www.w3.org/2001/sw/Europe/reports/intro.html">
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Reports</a>
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</li>
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<li>
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<a href="http://www.w3.org/2001/sw/Europe/showcase/presentations.html">
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Presentations</a>
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</li>
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</ul>
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</li>
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<li class="nonexpandingmenubar">
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<a href="http://www.w3.org/2001/sw/Europe/showcase/contact.html"
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id="contactMenu" name="contactMenu">Contact</a>
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</li>
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</ul>
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</div>
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</div>
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<!-- content goes here -->
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<div id="rightcontent">
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<h1 class="title">Large Scale Discovery Demonstrator</h1>
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<p>This demonstrator is designed to show a feature developed during
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SWADE which was found to be of key importance when dealing with
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discovery and presentation of large scale RDF data - tracking where
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the data was from, or provenance and enabling displaying that.</p>
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<p>The key outputs of this work are:</p>
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<ul>
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<li>Redland Contexts design</li>
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<li><a href="http://librdf.org/contexts">Demonstration</a> showing
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this over a large set of RDF files from the web</li>
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<li>Several releases of <a href="http://librdf.org/">Redland</a>
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software providing the contexts feature</li>
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<li>Reports detailing the <a href=
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"http://www.w3.org/2001/sw/Europe/reports/rdf_scalable_storage_report/">
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state of existing RDF storage systems</a> <a href=
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"http://www.w3.org/2001/sw/Europe/reports/dev_workshop_report_4/">current
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issues</a> (workshop), <a href=
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"http://www.w3.org/2001/sw/Europe/reports/rdf_scalable_storage_impl/">
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Redland storage improvements</a> and <a href=
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"http://www.w3.org/2001/sw/Europe/reports/large_scale_demo/">the
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design of the demonstrator</a>.</li>
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<li>Identification of a demand for tools with support for
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provenance.</li>
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<li>Feeding into work in the <a href=
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"http://www.w3.org/2001/sw/DataAccess/">W3C RDF Data Access Working
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Group (DAWG)</a> to provide this feature in query languages for
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RDF.</li>
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</ul>
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<p>All data, software and documents were developed using open
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technical standards and open source.</p>
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<p>Key goals of the demonstrator include:</p>
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<ul>
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<li>Identifying the key problems and issues with large scale RDF
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data.</li>
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<li>Enhancing tools to address these problems</li>
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<li>Showing the use of the tools with this feature, solving the
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problems</li>
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</ul>
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<p>The provenance tracking issue, or contexts, was found to be
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important after the related <a href=
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"http://www.w3.org/2001/sw/Europe/reports/dev_workshop_report_4/">Developer
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Workshop Report 4 - Workshop on Semantic Web Storage and
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Retrieval</a> held in November 2003, Amsterdam by which several of
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the participants were already considering the issues with large
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data, and large aggregated data, leading to needing to provide ways
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to manage them.</p>
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<p>A model was developed for Redland to provide a more general
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approach as it was not clear what the correct approach was that
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satisfied similar but not identical use cases for tracking.</p>
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<h2>Semantic web features demonstrated</h2>
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<p>The demonstrator illustrates the use of Redland Contexts to
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track data from several thousand different RDF data sources so that
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when information in the aggregated graph appears, the transaction
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that provided it can always be found - the provenance.</p>
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<p>This demonstrator primarily shows the semantic web components:
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distributed data + provenance + webness.</p>
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</div>
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</body>
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</html>
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