@abc.abstractmethod<EOL><INDENT>def new_nodes(self, notification_id, node_ids):<DEDENT>
pass<EOL>
The callback for notifications of new hierarchy nodes.

        :param notification_id: the notification ``Id``
        :type notification_id: ``osid.id.Id``
        :param node_ids: the ``Ids`` of the new nodes
        :type node_ids: ``osid.id.Id``


        *compliance: mandatory -- This method must be implemented.*