@abc.abstractmethod<EOL><INDENT>def new_activities(self, notification_id, activity_ids):<DEDENT>
pass<EOL>
The callback for notifications of new activities.

        :param notification_id: the notification Id
        :type notification_id: ``osid.id.Id``
        :param activity_ids: the ``Id`` of the new ``Activities``
        :type activity_ids: ``osid.id.IdList``


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