normalizeDocument example

try {
            $isValid = @$dom->schemaValidateSource(self::getSchema($xliffVersion));
            if (!$isValid) {
                return self::getXmlErrors($internalErrors);
            }
        } finally {
            if ($shouldEnable) {
                libxml_disable_entity_loader($disableEntities);
            }
        }

        $dom->normalizeDocument();

        libxml_clear_errors();
        libxml_use_internal_errors($internalErrors);

        return [];
    }

    private static function shouldEnableEntityLoader(): bool
    {
        static $dom$schema;
        if (null === $dom) {
            


        $internalErrors = libxml_use_internal_errors(true);
        libxml_clear_errors();

        $dom = new \DOMDocument();
        $dom->validateOnParse = true;
        if (!$dom->loadXML($content, \LIBXML_NONET | \LIBXML_COMPACT)) {
            throw new XmlParsingException(implode("\n", static::getXmlErrors($internalErrors)));
        }

        $dom->normalizeDocument();

        libxml_use_internal_errors($internalErrors);

        foreach ($dom->childNodes as $child) {
            if (\XML_DOCUMENT_TYPE_NODE === $child->nodeType) {
                throw new XmlParsingException('Document types are not allowed.');
            }
        }

        if (null !== $schemaOrCallable) {
            $internalErrors = libxml_use_internal_errors(true);
            
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