PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • it is actually reasonably easy to extrapolate information such as mass, by knowing just the duration of the orbit and how much the star dims.
http://www.w3.org/ns/prov#wasQuotedFrom
  • unmannedspaceflight.com