PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Some complexes such as refineries and chemical plants typically burn plant-generated mixed fuel gas and light-ends offgases as well as expensive purchased natural gas.
http://www.w3.org/ns/prov#wasQuotedFrom
  • chemicalprocessing.com