> But that's not what I need, as I described in my last 
> message. So, what I described is not possible?

What you said in your message was:

>I like to change the rule that import precedence decides which rule matches

And the answer to that is: no, you can't change the language specification.

But you didn't say anywhere in your message what you needed, you only said
what you wanted. If you describe your problem, rather than a proposed
solution which doesn't work, then we can help you.

Michael Kay
http://www.saxonica.com/