@abc.abstractmethod<EOL><INDENT>def register_for_changed_catalog(self, catalog_id):<DEDENT>
pass<EOL>
Registers for notification of an updated catalog.

        ``CatalogReceiver.changedCatalogs()`` is invoked when the
        specified catalog is changed.

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

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