JEP-0107, a Jabber enhancement suggestion for user moods, was released yesterday. Here’s an example of mood showing up in a presence packet:
<presence>
<show>dnd</show>
<status>Wooing Juliet</status>
<mood value='excited' xmlns='http://jabber.org/protocol/moods'/>
</presence>
I’ve got a knife that’s +9 against ogres!