"RDFa" . "VOID" . "CTAG" . "Role" . "OWL" . "XHV" . "CC" . "SIOC" . "RDF" . "RDFS" . "WDR" . "FOAF" . "GR" . "DescribedBy" . "RIF" . "License" . "XML" . "XSD" . "VCARD" . "GRDDL" . "V" . "MA" . "SKOS-XL" . "ICAL" . "SKOS" . "WDRS" . "DC" . "DCTERMS" . "OG" . "Schema" . "REV" .