[jdev] Presence Model

[tina sky]

Hallo,

following questions are puzzeling me:

does Jabber/XMPP have its own presence model to structure presence
information? If yes, is it extensible?

is the SIP/SIMPLE presence model (person--service--device) used in
Jabber/XMPP? 


Thanks a lot & best wishes.

Tina


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