PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • The commands may be transmitted in the form of message attributes included in a header that forms a part of the electronic mail object, and that normally includes such information as the date the message was created, the time that the message was sent, the sender, a title or name of the message, and other information about the document.
http://www.w3.org/ns/prov#wasQuotedFrom
  • google.com