PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • The Project Icarus team, now updating the original Project Daedalus, is asking this and many other questions about the original design, including whether or not there is a case to be made for a planet like Uranus, likewise rich in helium-3 but with a much shallower gravity well.
http://www.w3.org/ns/prov#wasQuotedFrom
  • centauri-dreams.org