How to use GetParent and GetParent2

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

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%

set xml0 = Server.CreateObject("Chilkat_9_5_0.Xml")

'  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:
Set 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.

Set bookNode = xml.GetChild(0)

'  Set titleNode equal to the title child of bookNode:

Set titleNode = bookNode.GetChildWithTag("title")

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

Set 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()

Response.Write str1 & "<br>"
Response.Write str2 & "<br>"
Response.Write str3 & "<br>"

%>
</body>
</html>