PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • The most active period of star formation came later, when the universe was a sprightly 2 to 3 billion years old.
http://www.w3.org/ns/prov#wasQuotedFrom
  • skyandtelescope.com