PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • The U.S. shale gas boom resulted in abundant new gas supply that has depressed U.S. natural gas prices, but natural gas prices in overseas markets such as Asia continue to trade at a premium versus the United States.
http://www.w3.org/ns/prov#wasQuotedFrom
  • rigzone.com