public static function removeIncludedRoles( core_kernel_classes_Resource $role)
    {
        $serial = self::buildIncludedRolesSerial($role);
        ServiceManager::getServiceManager()->get('generis/cache')->remove($serial);;

        // -- note: the cache might exist even if it was successfully
        // removed due to race conditions.
        // $returnValue = (file_exists(GENERIS_CACHE_PATH . $serial)) ? false : true;
        return true;
    }