PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • und the world and as a greater percentage of the oil that remains is more difficult to pump and more expensive to extract from alternative sources such as tar sands, oil shale or coal.
http://www.w3.org/ns/prov#wasQuotedFrom
  • dissidentvoice.org