http://www.w3.org/ns/prov#value | - Open standards are about interop, not implementation - so the most important thing is that anyone can interop with your service using known standards.That said, XMPP can, and often does, make for a great middleware service as well, and this use-case is important too, as it gives you that ability to side-step vendor lock-in which is vital for agility.
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