PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Since the passage of the Clean Water Act in 1972, we have made great strides in protecting our nation's waters by targeting point source pollutants???pollutants discharged directly from pipes, such as from a factory or sewage treatment plant.
http://www.w3.org/ns/prov#wasQuotedFrom
  • noaa.gov