@utilities.arguments_not_none<EOL><INDENT>def order_by_state(self, process_id, style):<DEDENT>
raise errors.Unimplemented()<EOL>
Orders by the state in a given ``Process``.

        arg:    process_id (osid.id.Id): a process ``Id``
        arg:    style (osid.SearchOrderStyle): search order style
        raise:  NullArgument - ``process_id`` or ``style`` is ``null``
        *compliance: mandatory -- This method must be implemented.*