rapidxml 节点加入另一个xml

void TestRapidXml()
{
    char* xmlContent = new char[1024];
    sprintf(xmlContent,"<root><head>aaa</head><body>bbb</body></root>");

    xml_document<> xmlDoc;
    xmlDoc.parse<0>(xmlContent);

    char* xmlContent2 = new char[1024];
    sprintf(xmlContent2,"<point x="1" y ="1"/><point x="2" y ="2"/>");
    xml_document<> xmlDoc2;
    xmlDoc2.parse<0>(xmlContent2);

    xml_node<>* root = xmlDoc.first_node();
    for(xml_node<>* node = xmlDoc2.first_node();node!=NULL;node=node->next_sibling())
    {
        // 注意：这里使用xmlDoc，是大的xml，不要使用xmlDoc2.
        root->append_node(xmlDoc.clone_node(node));
    }

    string xmlStr = "";
    rapidxml::print(std::back_inserter(xmlStr),xmlDoc,0); 
    
    delete []xmlContent;
    delete []xmlContent2;
}