private function extractXliff1(\DOMDocument $dom, MessageCatalogue $catalogue, string $domain)
    {
        $xml = simplexml_import_dom($dom);
        $encoding = strtoupper($dom->encoding);

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

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

            $file->registerXPathNamespace('xliff', $namespace);

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

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

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

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

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

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

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

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