PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • A single-phase drilling fluid is a drilling system where a compressed gas such as air, nitrogen, carbon dioxide, or mixtures or combinations thereof is injected into a drilling fluid in the presence of a foamer or a viscosifying agent that creates a stable foam???a drilling foam.
http://www.w3.org/ns/prov#wasQuotedFrom
  • google.com