PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • These activities have increased the amount of 'greenhouse gases' in the atmosphere, especially carbon dioxide, methane, and nitrous oxide.
http://www.w3.org/ns/prov#wasQuotedFrom
  • procon.org