@abc.abstractmethod<EOL><INDENT>def order_by_resource(self, style):<DEDENT>
pass<EOL>
Specified a preference for ordering results by the resource.

        :param style: a search order style
        :type style: ``osid.SearchOrderStyle``
        :raise: ``NullArgument`` -- ``style`` is ``null``

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