Subject	Predicate	Object	Graph
foaf:primaryTopic http://xmlns.com/foaf/0.1/primaryTopic	rdfs:comment http://www.w3.org/2000/01/rdf-schema#comment	The primary topic of some page or document. http://www.w3.org/2001/XMLSchema#string	http://xmlns.com/foaf/0.1/ http://xmlns.com/foaf/0.1/