PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Halliburton has experience in developing natural gas from the Marcellus, Haynesville and other shale plays in the U.S.
http://www.w3.org/ns/prov#wasQuotedFrom
  • utsandiego.com