internal DataDocumentXPathNavigator(XmlDataDocument doc, XmlNode node)
 {
     this._curNode = new XPathNodePointer(this, doc, node);
     this._temp    = new XPathNodePointer(this, doc, node);
     this._doc     = doc;
 }
 private DataDocumentXPathNavigator(DataDocumentXPathNavigator other)
 {
     this._curNode = other._curNode.Clone(this);
     this._temp    = other._temp.Clone(this);
     this._doc     = other._doc;
 }