@abc.abstractmethod<EOL><INDENT>def get_ids_by_catalog(self, catalog_id):<DEDENT>
return<EOL>
Gets the list of ``Ids`` map to a ``Catalog``.

        :param catalog_id: a catalog ``Id``
        :type catalog_id: ``osid.id.Id``
        :return: list of ``Ids`` mapped to the given ``catalog_id``
        :rtype: ``osid.id.IdList``
        :raise: ``NotFound`` -- ``catalog_id`` is not found
        :raise: ``NullArgument`` -- ``catalog_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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