PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Each of these phases (drilling, completion, and production) make use of a complex variety of equipment, including tubular members such as casing, production tubing, landing nipples, and gas lift mandrels; flow control devices such as gas lift valves, subsurface safety valves, and packers; and other equipment, such as perforation guns.
http://www.w3.org/ns/prov#wasQuotedFrom
  • google.com