PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • These shales are an important source rock for oil and gas, for example in the subsurface of the North Sea.
http://www.w3.org/ns/prov#wasQuotedFrom
  • answerparty.com