[Qt-interest] How can change value of node in XML file?

[Prot Netin]

Hi all,

I have a xml file such as:
<config>
<lm>100</lm>
</config>

How can i update 100 to new value such as 50?

I can get 100 from file using QDomDocument, QDomNode, QDomElement classes and QDomElemet::text method.
But i can not update file. How can i do that? which class or function 
should i use to update <lm>100</lm> to 
</lm>50</lm>? 
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