R. D. F.

Resource Description Framework : Infrastructure de description de ressources.

Besoin

Développer un "Web sémantique" en permettant :

• de trouver des ressources
• de cataloguer un contenu et ses relations
• l'émergence d'agents intelligents facilitant le partage de connaissance et l'échange
• l'évaluation de contenu

Analyse

RDF définit des métadonnées (description de données)

Conception

RDF utilise XML.

Exemples

Un exemple de document RDF est :

<?xml:namespace href="http://www.w3c.org/RDF/" as="RDF"?>
<?xml:namespace href="http://purl.oclc.org/RDF/DC/" as="DC"?>

<RDF:RDF>

  <RDF:Description RDF:HREF="http://www.ariadne.ac.uk/" RDF:BAGID="ARIADNE_RDF">
    <DC:Title>Ariadne - The Web Version</DC:Title>
    <DC:Subject>journal, magazine, elib, electronic libraries, digital libraries, networking, Web, IT, higher education</DC:Subject>
    <DC:Description>A Web and print magazine of Internet issues for librarians and information specialists</DC:Description>
    <DC:Publisher>UKOLN, University of Bath</DC:Publisher>
    <DC:Type>Text.Serial.Magazine</DC:Type>
    <DC:Format>text/html</DC:Format>
    <DC:Identifier>URN:ISSN:1361-3200</DC:Identifier>
  </RDF:Description>

  <RDF:Description RDF:HREF="#ARIADNE_RDF">
    <DC:Creator RDF:HREF="http://www.ukoln.ac.uk/ukoln/staff/a.powell.rdf#Andy_Powell"/>
    <DC:Date>
      <RDF:Description>
        <DC:Date.Type>Created</DC:Date.Type>
        <DC:Date.Value>1998-03-07</DC:Date.Value>
      </RDF:Description>
    </DC:Date>
  </RDF:Description>

</RDF:RDF>

Notes

Un sous-ensemble de RDF est RSS.

Voir

• Spécification
  • RDF Site Summary (RSS) 1.0
• Outils/API
  • Jena Java RDF API de Brian McBride, Jeremy Carroll, Andy Seaborne, Dave Reynolds et Ian Dickinson, HP Labs, Bristol - API for manipulating RDF models including statement and resource-centric methods using cascading calls for easy object orientated use, container support, the ARP RDF/XML parser, an RDF/XML writer, the RDQL query language, DAML support, persistent storage. Available under an open source, BSD-like license.
  • ICS-FORTH RDFSuite - open source, high-level scalable tools for the Semantic Web. This suite includes VAalidating RDF Parser (VRP), a RDF Schema Specific DataBase (RSSDB) and supporting RDF Query Language (RQL)
  • IsaViz : A visual authoring tool for browsing and authoring RDF models represented as graphs. Developed by Emmanuel Pietriga of W3C and Xerox Research Centre Europe, IsaViz is based on the Xerox Visual Transformation Machine.