PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • The federal government already regulates ammonia and hydrogen sulfide emissions and is looking at controlling greenhouse gases such as carbon dioxide and methane.
http://www.w3.org/ns/prov#wasQuotedFrom
  • amarillo.com