PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Ruby allows you to ask whether the method is available or not, with their response to method, so I think that is enough for the user to know.
http://www.w3.org/ns/prov#wasQuotedFrom
  • infoq.com