PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • If (1) an empty term signifies something, and if (2) every thing is an existing thing, then an empty term signifies an existing thing.
http://www.w3.org/ns/prov#wasQuotedFrom
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