PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • The third assumes the recipient uses iMessage, which is unlikely and will confuse people such as the author when it fails to work.
http://www.w3.org/ns/prov#wasQuotedFrom
  • osnews.com