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Re:Message from Facebook: this could be war by onestone on Wednesday March 25, 2015 @11:29AM (#9263570)
One more thing to dislike about XMPP/Jabber is that it's XML based. Writing products on top of it is unnecessarily verbose and complicated (also due to the bad choices you mentioned). A modern messaging protocol should use JSON.
Re:Message from Facebook: this could be war by userbinator on Wednesday March 25, 2015 @06:51PM (#9266584)
Or something even simpler, like the line-based structure of IRC and MSNP; but you're right, it doesn't need to be XML to be extensible.