PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • It sounds a little far out at first, but with materials science advances such as nanotubes and other new materials, we are reaching the stage where this starts to look like real science, a real advance for space transport.
http://www.w3.org/ns/prov#wasQuotedFrom
  • spacedaily.com