@abc.abstractmethod<EOL><INDENT>def get_composition_ids_by_repository(self, repository_id):<DEDENT>
return<EOL>
Gets the list of ``Composition``  ``Ids`` associated with a ``Repository``.

        :param repository_id: ``Id`` of the ``Repository``
        :type repository_id: ``osid.id.Id``
        :return: list of related composition ``Ids``
        :rtype: ``osid.id.IdList``
        :raise: ``NotFound`` -- ``repository_id`` is not found
        :raise: ``NullArgument`` -- ``repository_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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