PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • It produces biogas, a methane and carbon dioxide mix emanating from manure, grease, sewage or other organic materials allowed to stew in an oxygen-free chamber.
http://www.w3.org/ns/prov#wasQuotedFrom
  • thinkprogress.org