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" 
    xmlns:MY_a="urn:my:a" xmlns:MY_b="urn:my:b">

    ...
</MY_main:root>

```

... or the other way round.

How do I achieve this using DOM in an elegant way?  

*That is, without searching for attribute names starting with "xmlns".*