PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • A large portion of the nation's natural gas production stream comes out of the ground contaminated by water, carbon dioxide, hydrogen sulfide, or nitrogen and other inert gases.
http://www.w3.org/ns/prov#wasQuotedFrom
  • osti.gov