@abc.abstractmethod<EOL><INDENT>def register_for_deleted_activity(self, activity_id):<DEDENT>
pass<EOL>
Registers for notification of a deleted activity.

        ``ActivityReceiver.changedActivities()`` is invoked when the
        specified activity is removed from this objective bank.

        :param activity_id: the ``Id`` of the ``Activity`` to monitor
        :type activity_id: ``osid.id.Id``
        :raise: ``NullArgument`` -- ``activity_id is null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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