PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Many firms are working on cellulosic ethanol, derived from organic materials such as grasses or wood chips, but those factories are still in the pilot or demonstration stage.
http://www.w3.org/ns/prov#wasQuotedFrom
  • washingtonpost.com