PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • The terms ???unknown??? and ???unknown information??? refer to information that is not heretofore known, including information capable of becoming known (i.e., knowable and discoverable information) and information not capable of becoming known (i.e., unknowable information).
http://www.w3.org/ns/prov#wasQuotedFrom
  • google.ca