PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • In a worst-case scenario, missions, particularly to the outer solar system, may have to be deferred regardless of their importance or available funding because of a lack of plutonium-238 needed to power them.
http://www.w3.org/ns/prov#wasQuotedFrom
  • thespacereview.com