Use Dublin Core elements.
http://dmoz.org/rdf/structure.example.txt <RDF xmlns:r="http://www.w3.org/TR/RDF/" xmlns:d="http://purl.org/dc/elements/1.0/" xmlns="http://directory.mozilla.org/rdf"> <Topic r:id="Top"> <tag catid="1"/> <d:Title>Top</d:Title> </Topic> <Topic r:id="Top/Arts"> <tag catid="2"/> <d:Title>Arts</d:Title> <link r:resource="http://www3.bc.sympatico.ca/PHILLIPSHOTGLASS/GlassPage.html"/> </Topic> <Topic r:id="Top/World"> <tag catid="16"/> <d:Title>World</d:Title> <narrow r:resource="Top/World/Español"/> <narrow r:resource="Top/World/Chinese"/> <narrow r:resource="Top/World/Deutsch"/> </Topic> </RDF>
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