PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Helium is an element and cannot be synthesized (the amount generated by a hypothetical working fusion reactor is negligible).
http://www.w3.org/ns/prov#wasQuotedFrom
  • econbrowser.com