public static function setConfig($identifier, array $config)
    {
        $objIdentifier = self::getIdentifier($identifier);
        $strIdentifier = (string) $objIdentifier;

        if (isset(self::$_configs[$strIdentifier])) {
            self::$_configs[$strIdentifier] = self::$_configs[$strIdentifier]->append($config);
        } else {
            self::$_configs[$strIdentifier] = new AnConfig($config);
        }
    }