I'm attempting to answer the question, "Does any XML document described by A.xsd satisfy the constraints of B.xsd?" ...

Ouch! Well that told me :)

I have to say that the thought that crosses my mind is an old joke about the guy that answered the question:

How can I get to X^*, from here?

^*Avoiding racial sterotypes here!

And got the reply.

If I were you, I wouldn't be starting from here!

I happen to think that the benefits of XML have been way oversold, and I'm not even certain that I know what an .xsd is.

In any case, I wish you the very best of luck in your endevour.