@abc.abstractmethod<EOL><INDENT>def register_for_changed_composition(self, composition_id):<DEDENT>
pass<EOL>
Registers for notification of an updated composition.

        ``CompositionReceiver.changedCompositions()`` is invoked when
        the specified composition is changed.

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

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