PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Hydraulic fracturing is a widely used technique for stimulating the production of fluids, such as oil and gas, from subterranean formations.
http://www.w3.org/ns/prov#wasQuotedFrom
  • google.com