PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • However, some XMPP applications include information that is not communications-relevant, such as the hash of a user's avatar icon (see [XEP???0153] (Saint-Andre, P., ???vCard-Based Avatars,??? August 2006.) and even metadata about the music to which a user is listening (see [XEP???0118] (Saint-Andre, P., ???User Tune,??? June 2007.)).
http://www.w3.org/ns/prov#wasQuotedFrom
  • xmpp.org