PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • So-called unconventional oil ??? shale oil, tar sands and biofuels ??? are the most controversial forms of the fuel.
http://www.w3.org/ns/prov#wasQuotedFrom
  • climatecentral.org