PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Yet since wind and solar power are intermittent and other technologies are still experimental, a constant source of low-carbon electricity will also be needed.
http://www.w3.org/ns/prov#wasQuotedFrom
  • economist.com