PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Note that other reforming reaction fuel sources may also need to be pre-treated for removal or sulfur or other impurities, for example, natural gas.
http://www.w3.org/ns/prov#wasQuotedFrom
  • google.es