And yes, XMPP is extensible, so you might see such notifications with more content (e.g. the user can set an offline message), but the beauty is that not every client need implement support for that, which is handy if you're writing a thin client like a bot, or doing machine-to-machine communication. But every XMPP client will interpret the core meaning exactly the same: the user has gone offline.
A user going offline would be:
And yes, XMPP is extensible, so you might see such notifications with more content (e.g. the user can set an offline message), but the beauty is that not every client need implement support for that, which is handy if you're writing a thin client like a bot, or doing machine-to-machine communication. But every XMPP client will interpret the core meaning exactly the same: the user has gone offline.