PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • The sampling revealed oil, methane, arsenic, and metals including copper and vanadium ??? as well as other compounds ???in shallow water wells.
http://www.w3.org/ns/prov#wasQuotedFrom
  • npr.org