PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • This dust and gas is mostly primordial hydrogen and helium, but it also contains a smattering of heavier elements, which astronomers call metals" (even though non-astronomers do not normally think of all of these elements as metals).
http://www.w3.org/ns/prov#wasQuotedFrom
  • spacedaily.com