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,

Nistor Boscan