http://www.w3.org/2000/01/rdf-schema#
http://www.w3.org/1999/02/22-rdf-syntax-ns#
http://www.w3.org/2002/07/owl
http://www.w3.org/2004/02/skos/core
http://www.w3.org/2008/05/skos-xl#
http://www.w3.org/2001/XMLSchema#
http://www.w3.org/ns/sparql-service-description#
http://www.w3.org/TR/2009/REC-skos-reference-20090818
http://rdfs.org/ns/void#
http://purl.org/net/vocab/2004/03/label