PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • For example, the Mississippi carries excess nutrients, such as nitrogen and phosphorus, into the Gulf of Mexico, fueling algal blooms that deplete dissolved oxygen in coastal waters, producing a low-oxygen, or ???hypoxic,??? zone every summer off the coast of Louisiana and Texas.
http://www.w3.org/ns/prov#wasQuotedFrom
  • usgs.gov