@abc.abstractmethod<EOL><INDENT>def order_assets(self, asset_ids, composition_id):<DEDENT>
pass<EOL>
Reorders a set of assets in a composition.

        :param asset_ids: ``Ids`` for a set of ``Assets``
        :type asset_ids: ``osid.id.Id[]``
        :param composition_id: ``Id`` of the ``Composition``
        :type composition_id: ``osid.id.Id``
        :raise: ``NotFound`` -- ``composition_id`` not found or, an ``asset_id`` not related to ``composition_id``
        :raise: ``NullArgument`` -- ``instruction_ids`` or ``agenda_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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