internal void ResetParentInElementIdAttrMap(string oldVal, string newVal)
{
XmlElement parentElem = parent as XmlElement;
Debug.Assert(parentElem != null);
XmlDocument doc = parent.OwnerDocument;
Debug.Assert(doc != null);
doc.RemoveElementWithId(oldVal, parentElem); //add the element into the hashtable
doc.AddElementWithId(newVal, parentElem);
}