How to process elements with and without namespaces

Hi
 
I would like to process XML files that it's document root element can have
or not have namespaces:
 
For example:
 
XML 1:
 
<root>
  ...
</root>
 
XML 2:
 
<root xml:ns="http://whatever.com.ve";>
  ...
</root>
 
How can I write my XSL document to process both?

Thanks in advance
 
Regards,
 
Néstor Boscán