@abc.abstractmethod<EOL><INDENT>def get_maps_by_provider(self, resource_id):<DEDENT>
return<EOL>
Gets a ``MapList`` for the given provider.

        In plenary mode, the returned list contains all known maps or an
        error results. Otherwise, the returned list may contain only
        those maps that are accessible through this session.

        :param resource_id: a resource ``Id``
        :type resource_id: ``osid.id.Id``
        :return: the returned ``Map`` list
        :rtype: ``osid.mapping.MapList``
        :raise: ``NullArgument`` -- ``resource_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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