PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • A continuing problem, as I???ve noted here before, is the lack of support for the SIP signaling and session-management protocol standards, as well as for IM and presence protocols such as XMPP and SIMPLE. Although we will see compelling unified-communications services online, they???ll be disparate islands or silos of communication.
http://www.w3.org/ns/prov#wasQuotedFrom
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