PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • However, the current supply of hydrogen depends on fossil fuels, including methane, which is believed to be 10 times more potent as a global warming threat than carbon dioxide, and natural gas and gasoline, which emit carbon dioxide.
http://www.w3.org/ns/prov#wasQuotedFrom
  • iisd.ca