rename « namespace « Java XML Q&A

1. Java+DOM: How do I elegantly rename an xmlns:xyz attribute?    stackoverflow.com

I have something like that as input:

<root xmlns="urn:my:main" 
    xmlns:a="urn:my:a" xmlns:b="urn:my:b">

    ...
</root>

And want to have something like that as output:

<MY_main:root xmlns:MY_main="urn:my:main" 
    ...