PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • One example of generating a message ID is to use an existing message ID such as the ???Message-ID:??? field of an email header.
http://www.w3.org/ns/prov#wasQuotedFrom
  • google.com