PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • This is a best practice because typically a client is not designed to connect to all kinds of services using all possible application protocols, but instead is designed to connect to a specific kind of service, such as a web site, an email service, or an instant messaging service.
http://www.w3.org/ns/prov#wasQuotedFrom
  • xmpp.org