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IXMLDOMSelection clone issue

From: Kai@-----------.---------.---
To: NULL
Date: 5/30/2009 4:56:00 AM

After I get a IXMLDOMNodeList, then I make a IXMLDOMSelection. In order to 
avoid
modification of my orginal selection, I make a copy of my selection by 
IXMLDOMSelection->clone. But I found if I use removeNext to remove unwanted 
items, the orignal selection is still modified. What is wrong?
see my code,

IXMLDOMNodeList *pNodes=NULL;
IXMLDOMSelection *pSelection=NULL;

CHECK(pNodes->get_length(&uLength), "get selection length");
CHECK(pNodes->QueryInterface(IID_IXMLDOMSelection,(void**)&pSelection), "");
SAFE_RELEASE(pNodes);

if(SUCCEEDED(hr) && pSelection && uLength)
    {
      IXMLDOMSelection *MySelection;
      pSelection->clone(&MySelection);
     SAFE_RELEASE(pSelection);
     .....
     MySelection->peekNode(&pNode);
     pNode->get_text(&bstr);
    ......			
     MySelection->removeNext(&pNode);
   }

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IXMLDOMSelection clone issue