PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Made ground (ground that has been formed by the activities of man and can consist of natural or man made materials) (CH4, CO2, H2S, VOCs and any other gas)
http://www.w3.org/ns/prov#wasQuotedFrom
  • triton-chemicals.co.uk