PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Fracking is a process used in drilling in which water, sand and other fluids are injected into the shale to extract the oil and gas stored there.
http://www.w3.org/ns/prov#wasQuotedFrom
  • salemnews.net