def _parse_node(self, verbElement):
        """
        Parse the required node identifier out of the verbElement.
        """
        try:
            self.nodeIdentifier = verbElement["node"]
        except __HOLE__:
            raise BadRequest('nodeid-required')
dataset/ETHPy150Open ralphm/wokkel/wokkel/pubsub.py/PubSubRequest._parse_node