PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • as wires, air, or a vacuum??? are invalid because ???[t]hose types of signals are not encompassed by
http://www.w3.org/ns/prov#wasQuotedFrom
  • groklaw.net