public static function buildAutoCreatedChildNodeIdentifier($childNodeName, $identifier)
    {
        $hex = md5($identifier . '-' . $childNodeName);

        return substr($hex, 0, 8) . '-' . substr($hex, 8, 4) . '-' . substr($hex, 12, 4) . '-' . substr($hex, 16, 4) . '-' . substr($hex, 20, 12);
    }