PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Methane, the main component of natural gas, is a fossil fuel like crude and coal; when burned it produces carbon dioxide and other greenhouse gases, so called because they trap the heat of the sun???s rays in the atmosphere, warming the earth???s surface.
http://www.w3.org/ns/prov#wasQuotedFrom
  • ipsnews.net