PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • ???This is a new area of research,??? said McMahon, ???so there are a lot of unanswered questions.
http://www.w3.org/ns/prov#wasQuotedFrom
  • phys.org