Copy xml element/node to another document

static void testCopyNode(Args _args)
{
    #define.ActivityPath("Message//Activity")
    str                         xml;
    VKCallCenterIntegration     callCenterIntegration;
    XmlDocument                 doc,
                                docOut;
    XmlElement                  xmlActivity,
                                xmlActivityCopy;
    XmlNode                     docNode;

    xml = @'<?xml version="1.0" encoding="UTF-8"?>
<Message>
    <Activity>
        <Id>GiftOptions</Id>
        <Language>EN-GB</Language>
        <DataRequest>1</DataRequest>
    </Activity>
</Message>';
    
    doc         = xmlDocument::newXml(xml);
    xmlActivity = doc.selectSingleNode(#ActivityPath);
    if (xmlActivity)
    {
        docOut  = new XmlDocument();
        docNode = docOut.createXmlDeclaration("1.0", 'UTF-8', "");
        docOut.appendChild(docNode);
        
        xmlActivityCopy = docOut.importNode(xmlActivity, true);
        docOut.appendChild(xmlActivityCopy);
        xml = docOut.outerXml();
    }
    
}