PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • In many regions of the US, including Texas, North Dakota and Montana, deep-well underground injection is a popular method for the disposal of fracking fluids and other substances from shale oil and gas extraction operations.
http://www.w3.org/ns/prov#wasQuotedFrom
  • waterworld.com