XML tutorial

Hello,

I am looking for an XML tutorial to change a value in an xml structure.
For the moment I am using the functions from the common/gamescript/xml.cs
It's works fine to create an xml file or to read a Field value.
But then I am stuck to change a single Field value.
Any idea how to proced ?

Here this my code to create the xml file

%xml = new ScriptObject() { class = "XML"; };
%projectFile = "Filename.xml";
%xml.beginWrite( %projectFile );
%xml.writeClassBegin( "XML Section" );
%xml.writeField( "SomeData", "Random value" );
%xml.writeClassEnd();
%xml.endWrite();
%xml.delete();

The result is :

<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
<XML Section>
<SomeData>Random value</SomeData>
</XML Section>


And here my code to get a value from an xml file

%Xml = new ScriptObject(){class = "XML";};  
%Xml.beginRead("Filename.xml");
%Xml.readClassBegin("XMLSection");  
%SomeData = %Xml.readField("SomeData");  
%Xml.readClassEnd();  
%Xml.delete();

echo (%SomeData);

The result is :
"Random value"

Thanks for reply