@abc.abstractmethod<EOL><INDENT>def get_resource_ids_by_group(self, group_resource_id):<DEDENT>
return<EOL>
Gets the list of ``Resource``  ``Ids`` associated with a ``Resource``.

        In a federated view, resources for child groups are included.

        :param group_resource_id: ``Id`` of the ``Resource``
        :type group_resource_id: ``osid.id.Id``
        :return: list of member resource ``Ids``
        :rtype: ``osid.id.IdList``
        :raise: ``NotFound`` -- ``group_resource_id`` is not found
        :raise: ``NullArgument`` -- ``group_resource_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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