PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • In the case where the message has at least one message ID, the message is a reply or nested message and is linked to any messages referenced in the references field.
http://www.w3.org/ns/prov#wasQuotedFrom
  • google.com