PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • These two states are mutually exclusive, which implies that there is a third state in which the direction is not locked in either direction.
http://www.w3.org/ns/prov#wasQuotedFrom
  • webkit.org