[JDEV] adding xml tag to message

[Keith Emnett]

If a client adds an extra xml tag to a message (such as a new tag in the
<presence> message), will the server forward the message (keeping the extra
tag) to subscribed clients, or does it validate the message against a schema
and return an error of some sort?

Basically, is there a way for a client to encode additional information that
clients of the same type can recognize?

Thanks - Keith