Parses <Transition>

        @param node: Node containing the <Transition> element
        @type node: xml.etree.Element

def parse_transition(self, node):
        """
        Parses <Transition>

        @param node: Node containing the <Transition> element
        @type node: xml.etree.Element
        """

        if 'regime' in node.lattrib:
            regime = node.lattrib['regime']
        else:
            self.raise_error('<Transition> mut specify a regime.')

        action = Transition(regime)

        self.current_event_handler.add_action(action)