[Standards] Presence Priority Implementation Guide

[Rachel Blackman]

>>> It's also probably a good idea to forget the resource whenever  
>>> you get a presence change from that user's bare JID; certainly  
>>> you should if you get a presence change from the resource you're  
>>> chatting with.
>>
>> From the bare JID, yes, I agree (and handle it as such).  But I  
>> think a presence change from the resource in question is a bit too  
>> generalized; if I'm talking to someone on a resource that's marked  
>> 'idle' and then they mark it as available, I don't know that I  
>> really want/need to forget that resource.  Now, I agree if the  
>> presence is a /downward/ change -- available to away, away to xa,  
>> etc. -- that you should reset to bare JID for the next message,  
>> and effectively re-negotiate the conversation.
>
> Actually, instead of "from the bare JID" (which shouldn't really  
> happen), I meant to be "any presence change from any resource  
> associated with the bare JID", just to be clear.  If there's an  
> upward change from a different resource, that might affect things,  
> for example.

Sadly, I've seen bare-JID presences from some things such as  
transport gateways, and some odd XMPP services.  Something like  
Sparks at irc-gateway.example.com not having a resource in the presence,  
I mean.  So while it may not be /supposed/ to happen, it may still do  
so in some cases.

-- 
Rachel Blackman <rcb at ceruleanstudios.com>
Trillian Messenger - http://www.trillianastra.com/