<form method="POST">
    <h3>Editing: XliffFileLoader.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Translation\Loader;

use Symfony\Component\Config\Resource\FileResource;
use Symfony\Component\Config\Util\Exception\InvalidXmlException;
use Symfony\Component\Config\Util\Exception\XmlParsingException;
use Symfony\Component\Config\Util\XmlUtils;
use Symfony\Component\Translation\Exception\InvalidResourceException;
use Symfony\Component\Translation\Exception\NotFoundResourceException;
use Symfony\Component\Translation\Exception\RuntimeException;
use Symfony\Component\Translation\MessageCatalogue;
use Symfony\Component\Translation\Util\XliffUtils;

/**
 * XliffFileLoader loads translations from XLIFF files.
 *
 * @author Fabien Potencier &lt;fabien@symfony.com&gt;
 */
class XliffFileLoader implements LoaderInterface
{
    public function load(mixed $resource, string $locale, string $domain = 'messages'): MessageCatalogue
    {
        if (!class_exists(XmlUtils::class)) {
            throw new RuntimeException('Loading translations from the Xliff format requires the Symfony Config component.');
        }

        if (!$this-&gt;isXmlString($resource)) {
            if (!stream_is_local($resource)) {
                throw new InvalidResourceException(sprintf('This is not a local file &quot;%s&quot;.', $resource));
            }

            if (!file_exists($resource)) {
                throw new NotFoundResourceException(sprintf('File &quot;%s&quot; not found.', $resource));
            }

            if (!is_file($resource)) {
                throw new InvalidResourceException(sprintf('This is neither a file nor an XLIFF string &quot;%s&quot;.', $resource));
            }
        }

        try {
            if ($this-&gt;isXmlString($resource)) {
                $dom = XmlUtils::parse($resource);
            } else {
                $dom = XmlUtils::loadFile($resource);
            }
        } catch (\InvalidArgumentException|XmlParsingException|InvalidXmlException $e) {
            throw new InvalidResourceException(sprintf('Unable to load &quot;%s&quot;: ', $resource).$e-&gt;getMessage(), $e-&gt;getCode(), $e);
        }

        if ($errors = XliffUtils::validateSchema($dom)) {
            throw new InvalidResourceException(sprintf('Invalid resource provided: &quot;%s&quot;; Errors: ', $resource).XliffUtils::getErrorsAsString($errors));
        }

        $catalogue = new MessageCatalogue($locale);
        $this-&gt;extract($dom, $catalogue, $domain);

        if (is_file($resource) &amp;&amp; class_exists(FileResource::class)) {
            $catalogue-&gt;addResource(new FileResource($resource));
        }

        return $catalogue;
    }

    private function extract(\DOMDocument $dom, MessageCatalogue $catalogue, string $domain)
    {
        $xliffVersion = XliffUtils::getVersionNumber($dom);

        if ('1.2' === $xliffVersion) {
            $this-&gt;extractXliff1($dom, $catalogue, $domain);
        }

        if ('2.0' === $xliffVersion) {
            $this-&gt;extractXliff2($dom, $catalogue, $domain);
        }
    }

    /**
     * Extract messages and metadata from DOMDocument into a MessageCatalogue.
     */
    private function extractXliff1(\DOMDocument $dom, MessageCatalogue $catalogue, string $domain)
    {
        $xml = simplexml_import_dom($dom);
        $encoding = $dom-&gt;encoding ? strtoupper($dom-&gt;encoding) : null;

        $namespace = 'urn:oasis:names:tc:xliff:document:1.2';
        $xml-&gt;registerXPathNamespace('xliff', $namespace);

        foreach ($xml-&gt;xpath('//xliff:file') as $file) {
            $fileAttributes = $file-&gt;attributes();

            $file-&gt;registerXPathNamespace('xliff', $namespace);

            foreach ($file-&gt;xpath('.//xliff:prop') as $prop) {
                $catalogue-&gt;setCatalogueMetadata($prop-&gt;attributes()['prop-type'], (string) $prop, $domain);
            }

            foreach ($file-&gt;xpath('.//xliff:trans-unit') as $translation) {
                $attributes = $translation-&gt;attributes();

                if (!(isset($attributes['resname']) || isset($translation-&gt;source))) {
                    continue;
                }

                $source = isset($attributes['resname']) &amp;&amp; $attributes['resname'] ? $attributes['resname'] : $translation-&gt;source;
                // If the xlf file has another encoding specified, try to convert it because
                // simple_xml will always return utf-8 encoded values
                $target = $this-&gt;utf8ToCharset((string) ($translation-&gt;target ?? $translation-&gt;source), $encoding);

                $catalogue-&gt;set((string) $source, $target, $domain);

                $metadata = [
                    'source' =&gt; (string) $translation-&gt;source,
                    'file' =&gt; [
                        'original' =&gt; (string) $fileAttributes['original'],
                    ],
                ];
                if ($notes = $this-&gt;parseNotesMetadata($translation-&gt;note, $encoding)) {
                    $metadata['notes'] = $notes;
                }

                if (isset($translation-&gt;target) &amp;&amp; $translation-&gt;target-&gt;attributes()) {
                    $metadata['target-attributes'] = [];
                    foreach ($translation-&gt;target-&gt;attributes() as $key =&gt; $value) {
                        $metadata['target-attributes'][$key] = (string) $value;
                    }
                }

                if (isset($attributes['id'])) {
                    $metadata['id'] = (string) $attributes['id'];
                }

                $catalogue-&gt;setMetadata((string) $source, $metadata, $domain);
            }
        }
    }

    private function extractXliff2(\DOMDocument $dom, MessageCatalogue $catalogue, string $domain)
    {
        $xml = simplexml_import_dom($dom);
        $encoding = $dom-&gt;encoding ? strtoupper($dom-&gt;encoding) : null;

        $xml-&gt;registerXPathNamespace('xliff', 'urn:oasis:names:tc:xliff:document:2.0');

        foreach ($xml-&gt;xpath('//xliff:unit') as $unit) {
            foreach ($unit-&gt;segment as $segment) {
                $attributes = $unit-&gt;attributes();
                $source = $attributes['name'] ?? $segment-&gt;source;

                // If the xlf file has another encoding specified, try to convert it because
                // simple_xml will always return utf-8 encoded values
                $target = $this-&gt;utf8ToCharset((string) ($segment-&gt;target ?? $segment-&gt;source), $encoding);

                $catalogue-&gt;set((string) $source, $target, $domain);

                $metadata = [];
                if (isset($segment-&gt;target) &amp;&amp; $segment-&gt;target-&gt;attributes()) {
                    $metadata['target-attributes'] = [];
                    foreach ($segment-&gt;target-&gt;attributes() as $key =&gt; $value) {
                        $metadata['target-attributes'][$key] = (string) $value;
                    }
                }

                if (isset($unit-&gt;notes)) {
                    $metadata['notes'] = [];
                    foreach ($unit-&gt;notes-&gt;note as $noteNode) {
                        $note = [];
                        foreach ($noteNode-&gt;attributes() as $key =&gt; $value) {
                            $note[$key] = (string) $value;
                        }
                        $note['content'] = (string) $noteNode;
                        $metadata['notes'][] = $note;
                    }
                }

                $catalogue-&gt;setMetadata((string) $source, $metadata, $domain);
            }
        }
    }

    /**
     * Convert a UTF8 string to the specified encoding.
     */
    private function utf8ToCharset(string $content, string $encoding = null): string
    {
        if ('UTF-8' !== $encoding &amp;&amp; !empty($encoding)) {
            return mb_convert_encoding($content, $encoding, 'UTF-8');
        }

        return $content;
    }

    private function parseNotesMetadata(\SimpleXMLElement $noteElement = null, string $encoding = null): array
    {
        $notes = [];

        if (null === $noteElement) {
            return $notes;
        }

        /** @var \SimpleXMLElement $xmlNote */
        foreach ($noteElement as $xmlNote) {
            $noteAttributes = $xmlNote-&gt;attributes();
            $note = ['content' =&gt; $this-&gt;utf8ToCharset((string) $xmlNote, $encoding)];
            if (isset($noteAttributes['priority'])) {
                $note['priority'] = (int) $noteAttributes['priority'];
            }

            if (isset($noteAttributes['from'])) {
                $note['from'] = (string) $noteAttributes['from'];
            }

            $notes[] = $note;
        }

        return $notes;
    }

    private function isXmlString(string $resource): bool
    {
        return str_starts_with($resource, '&lt;?xml');
    }
}
</textarea><br>
    <input type="submit" value="Save">
</form>