How to use GetParent and GetParent2

How to use GetParent and GetParent2. This is a snippet of the document used in this example:

uses
    Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
    Dialogs, StdCtrls,
    CHILKATXMLLib_TLB,
    OleCtrls;

...

procedure TForm1.Button1Click(Sender: TObject);
var
xml0: CHILKATXMLLib_TLB.IChilkatXml;
xml: CHILKATXMLLib_TLB.IChilkatXml;
bookNode: CHILKATXMLLib_TLB.IChilkatXml;
titleNode: CHILKATXMLLib_TLB.IChilkatXml;
bookNode2: CHILKATXMLLib_TLB.IChilkatXml;
str1: String;
str2: String;
str3: String;

begin

xml0 := TChilkatXml.Create(Self).ControlInterface;

//  The Chilkat XML component is freeware.

//  Load an XML document.  Typically you might call LoadXml
//  to load an XML file.  This example loads an XML file from
//  a URL:
xml := xml0.HttpGet('http://www.chilkatsoft.com/testData/bookstore.xml');

//  The xml object points to the root node of the XML document.

//  Set bookNode equal to the 1st child of the root.

bookNode := xml.GetChild(0);

//  Set titleNode equal to the title child of bookNode:

titleNode := bookNode.GetChildWithTag('title');

//  Call GetParent to return a new object pointing to the parent node:

bookNode2 := titleNode.GetParent();

//  bookNode2 and bookNode point to the same node.

//  Call GetParent2 (which returns nothing) to modify the internal
//  pointer within the calling object so that it points to the immediate parent:
titleNode.GetParent2();

//  Now titleNode points to the same node as bookNode2 and bookNode.
//  To prove it, generate the XML sub-tree rooted at the calling
//  node and display each:

str1 := bookNode.GetXml();
str2 := bookNode2.GetXml();
str3 := titleNode.GetXml();

Memo1.Lines.Add(str1);
Memo1.Lines.Add(str2);
Memo1.Lines.Add(str3);

end;