symfony/translation · error · InvalidArgumentException

No support implemented for loading XLIFF version

Error message

No support implemented for loading XLIFF version "%s".

What it means

Thrown by XliffUtils::getSchema() when the XLIFF version detected from the file (via getVersionNumber) has no bundled XSD in this component. Supported versions are 1.2, 2.0, 2.1 and 2.2; anything else is rejected.

Solutions

1. Convert the file to XLIFF 1.2 or 2.x (2.0/2.1/2.2)
2. Correct the version/namespace attributes in the root <xliff> element
3. Skip schema validation (avoid validateSchema) and load with the appropriate loader, upgrading the format if needed

Example fix

// before
<xliff xmlns="urn:oasis:names:tc:xliff:document:1.1" version="1.1">
// after
<xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" version="1.2">

$version = XliffUtils::getVersionNumber($dom);
if (!in_array($version, ['1.2','2.0','2.1','2.2'], true)) {
    // convert the file or skip schema validation
}

try {
    XliffUtils::validateSchema($dom);
} catch (InvalidArgumentException $e) {
    if (str_contains($e->getMessage(), 'No support implemented')) {
        // migrate the file to a supported XLIFF version
    }
}

When it happens

Trigger: validateSchema() called on an XLIFF file whose namespace-derived version is not one of the supported strings, e.g. version '1.0', '2.3' or garbage after the namespace prefix.

Common situations: Files claiming exotic XLIFF versions, corrupted version attributes, or XLIFF 1.1 exports from legacy tools.

Related errors

• Not a valid XLIFF namespace
• No support implemented for dumping XLIFF version
• The scheme "null" is not supported by this provider.
• Provider " " not found. Available: " ".
• The scheme is not supported by any provider.

AI-assisted analysis of symfony/translation@ae9e8a51bc (2026-09-15). Data as JSON: /api/errors/f21f9d3b34f3c179. Report an issue: GitHub.

Appendix: source

Thrown at Util/XliffUtils.php:122

        return 'file:///'.$drive.implode('/', array_map('rawurlencode', $parts));
    }

    private static function getSchema(string $xliffVersion): string
    {
        if ('1.2' === $xliffVersion) {
            $schemaSource = file_get_contents(__DIR__.'/../Resources/schemas/xliff-core-1.2-transitional.xsd');
            $xmlUri = 'http://www.w3.org/2001/xml.xsd';
        } elseif (\in_array($xliffVersion, ['2.0', '2.1'], true)) {
            // XLIFF 2.1 adds optional modules (Change Tracking, ITS, ...) on top of 2.0.
            // We validate 2.1 documents against the 2.0 XSD: 2.1 documents that stick to
            // the 2.0 core load fine; documents that use 2.1-only modules will fail validation.
            $schemaSource = file_get_contents(__DIR__.'/../Resources/schemas/xliff-core-2.0.xsd');
            $xmlUri = 'informativeCopiesOf3rdPartySchemas/w3c/xml.xsd';
        } elseif ('2.2' === $xliffVersion) {
            $schemaSource = file_get_contents(__DIR__.'/../Resources/schemas/xliff-core-2.2.xsd');
            $xmlUri = 'informativeCopiesOf3rdPartySchemas/w3c/xml.xsd';
        } else {
            throw new InvalidArgumentException(\sprintf('No support implemented for loading XLIFF version "%s".', $xliffVersion));
        }

        return self::fixXmlLocation($schemaSource, $xmlUri);
    }

    /**
     * Internally changes the URI of a dependent xsd to be loaded locally.
     */
    private static function fixXmlLocation(string $schemaSource, string $xmlUri): string
    {
        static $newPath;

        if (null === $newPath) {
            $path = __DIR__.'/../Resources/schemas/xml.xsd';

            if (0 !== stripos($path, 'phar://')) {
                $newPath = self::getFileUrl($path);
            } elseif ($tmpfile = tempnam(sys_get_temp_dir(), 'symfony')) {

View on GitHub (pinned to ae9e8a51bc)