PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Although both problems are hard to approximate, one of these two is always a good approximation for any particular graph; the paper contains several similar results.
http://www.w3.org/ns/prov#wasQuotedFrom
  • blogspot.com