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appendNode example

        $xmlRootNodeName = $context[self::ROOT_NODE_NAME] ?? $this->defaultContext[self::ROOT_NODE_NAME];

        $dom = $this->createDomDocument($context);

        if (null !== $data && !\is_scalar($data)) {
            $root = $dom->createElement($xmlRootNodeName);
            $dom->appendChild($root);
            $this->buildXml($root, $data, $format, $context, $xmlRootNodeName);
        } else {
            $this->appendNode($dom, $data, $format, $context, $xmlRootNodeName);
        }

        return $dom->saveXML($ignorePiNode ? $dom->documentElement : null, $context[self::SAVE_OPTIONS] ?? $this->defaultContext[self::SAVE_OPTIONS]);
    }

    public function decode(string $data, string $format, array $context = []): mixed
    {
        if ('' === trim($data)) {
            throw new NotEncodableValueException('Invalid XML data, it cannot be empty.');
        }