'Send the required soap message to invoke the specified method
@param args: A list of args for the method invoked.
@type args: list
@param kwargs: Named (keyword) args for the method invoked.
@type kwargs: dict
@return: The result of the method invocation.
@rtype: I{builtin} or I{subclass of} L{Object}'

def invoke(self, args, kwargs):

    simulation = kwargs[self.injkey]
    msg = simulation.get('msg')
    reply = simulation.get('reply')
    fault = simulation.get('fault')
    if (msg is None):
        if (reply is not None):
            return self.__reply(reply, args, kwargs)
        if (fault is not None):
            return self.__fault(fault)
        raise Exception('(reply|fault)    expected    when    msg=None')
    sax = Parser()
    msg = sax.parse(string=msg)
    return self.send(msg)
