PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • The company optimizes the production of graphene, a pure-carbon substance that can be used to strengthen items such as plastics, inks and electric circuits and can enhance medical, chemical and industrial processes.
http://www.w3.org/ns/prov#wasQuotedFrom
  • rbj.net