PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • pipe elbow is a pipe fitting installed between two lengths of pipes to allow a change of direction, usually 45??, 90?? or 180??.
http://www.w3.org/ns/prov#wasQuotedFrom
  • topfitting.com