PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Currently, it takes a lot of electricity to generate hydrogen by water splitting, which is why most of the hydrogen manufactured today is derived from non-renewable sources such as coal and natural gas.
http://www.w3.org/ns/prov#wasQuotedFrom
  • tgdaily.com