'Execute the callback function with the matched stanza\'s
XML contents, instead of the stanza itself.
Overrides BaseHandler.run
Arguments:
payload  -- The matched stanza object.
instream -- Force the handler to execute during
stream processing. Used only by prerun.
Defaults to False.'

def run(self, payload, instream=False):

    Callback.run(self, payload.xml, instream)
