PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • An Exxon Mobil subsidiary is now at the basin using hydraulic fracturing ??? commonly referred to as fracking ??? to break apart the shale and free the gas by injecting large volumes of water, sand and other chemicals.
http://www.w3.org/ns/prov#wasQuotedFrom
  • washingtonpost.com