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If you really need to get under the skin of jabber.el, you can add
functions to the lists jabber-message-chain,
jabber-iq-chain and jabber-presence-chain. The
functions in these lists will be called in order when an XML stanza of
the corresponding type arrives, with the connection object and the
entire XML stanza passed as arguments. Earlier functions can modify
the stanza to change the behaviour of downstream functions, but
remember: with great power comes great responsibility.