MSXML append xml fragment as child

A C/C++ method used to append XML text to an MSXML node/element as child. The appendChild function can append only node/element objects. Sometimes it's easier or more convenient to create the XML with text concatenation than by building it using MSXML. And the code:

void appendXmlText(MSXML2::IXMLDOMElementPtr elem, _bstr_t xmlText)
{
 //only one root elem is allowed!
 _bstr_t xmlFragment = "<fragment>" + xmlText + "</fragment>";

 MSXML2::IXMLDOMDocument2Ptr _doc;
 TESTHR(_doc.CreateInstance(__uuidof(MSXML2::DOMDocument40)));
 _doc->validateOnParse = false;
 _doc->resolveExternals = false;
  
 _doc->loadXML(xmlFragment);
 MSXML2::IXMLDOMElementPtr root = _doc->documentElement;
 MSXML2::IXMLDOMNodeListPtr childs = root->childNodes;
 long childCount = root->childNodes->length;
 for (long i = 0; i < childCount; ++i)
 {
  MSXML2::IXMLDOMNodePtr childNode = root->childNodes->item[i];
  elem->appendChild(childNode->cloneNode(VBOOL_TRUE));
  //VBOOL_TRUE is -1
 }
}