The problem is similar to this:
but specifically for attribute. I have something like:
<person xmlns:a="http://example.com" xmlns:b="http://sample.net">
<a:fName a:age="37">John</a:fName>
<b:lName>Wayne</b:lName>
</person>
and I can't find a way to put the prefix to the attribute "age".
How the solution proposed in the link above must be changed to reach the goal? I tried different solution without success.