PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • A wide range of chemicals are used in virtually every drilling and production situation - whether it is the mud used to facilitate drilling, or other chemicals used to cement a well or stimulate production.
http://www.w3.org/ns/prov#wasQuotedFrom
  • investopedia.com