Presence elements can have jabber:x:data elements, where extra information can exist. Most clients probably discard presence jabber.x.data. Custom clients can use x.data to pass info to their subscribed clients via the server without getting pubsub involved.
Just because it can doesnt mean that it should, presence elements can have just about any element in them so long as its namespaced, it could have a persons avatar BASE64 encoded in the presence element, it could have the users vcard in it, it could have the user mood, but just because it can have these things doesnt mean that it should, that is the question at hand here.
Presence stanza's are only intended to express IM presence information (as far as I last heard), anything else (as has been done for the extended presence protocols like user mood) is supposed to be done using pubsub, certainly any new protocols should be.
Richard
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