PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Coal is...http://www.gccoal.com/about-us/met-coal-101.htmlAccording to Natural Resources CanadaCoal is classified, based on the pressure and temperature (metamorphism) to which it has been subjected, into four types or ranks.
http://www.w3.org/ns/prov#wasQuotedFrom
  • nepacrossroads.com