PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Biogas is a mixture of mainly methane and carbon dioxide with very small amounts of hydrogen sulphide and other impurities.
http://www.w3.org/ns/prov#wasQuotedFrom
  • bioenergy.org.nz