PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Somewhat unrelated, but still interesting, is an article on how oil is most likely produced by methane being heated between the mantle and the crust:
http://www.w3.org/ns/prov#wasQuotedFrom
  • home-school.com