/// <devdoc>
 /// Create a new instance of XmlHierarchyData.
 /// </devdoc>
 internal XmlHierarchyData(XmlHierarchicalEnumerable parent, XmlNode item) {
     _parent = parent;
     _item = item;
 }
 internal XmlHierarchyData(XmlHierarchicalEnumerable parent, XmlNode item)
 {
     this._parent = parent;
     this._item   = item;
 }