How to change value of element and update XML file

Hi
I have an xml file called test.xml like below
<?xml version="1.0" encoding="UTF-8"?>
<printing>
<userName/>
<viewName/>
</printing>I want to change value of user name and view name and update test.xml file in my folder
Anyone has sample code to do so
Ashish

Thanx
i was able to do so, but what i want now is to remove element
for example
i have following xml
<?xml version="1.0" encoding="UTF-8"?>
<printing>
<firstLineTexts>
          <firstLineText />
          <firstLineText>|line11</firstLineText>
          <firstLineText>|line12</firstLineText>
</firstLineTexts>
</printing>how do i remove all elements fireLineText
my final output should be
<?xml version="1.0" encoding="UTF-8"?>
<printing>
<firstLineTexts>
</firstLineTexts>
</printing>How do i do it using DOM,
I can create instance of DOM and write it using TransformerFactory
Ashish

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