Symfony\Component\Serializer\Encoder\XmlEncoder::appendXMLString PHP Méthode

    protected final function appendXMLString(\DOMNode $node, $val)
    {
        if (strlen($val) > 0) {
            $frag = $this->dom->createDocumentFragment();
            $frag->appendXML($val);
            $node->appendChild($frag);
            return true;
        }
        return false;
    }