XML & SQL connection

Hi:

I am currently building a school project were we are working with JSP's and two different DB managers (SQL server and MySql)

The point is that i have to make a query on the other DB (i am the one using sql server) and I am supposed to do this with XML (this is a must), I know this can be done because all I will be doing on the other DB is reading. Furthermore I am not going to store any of the data retrieved from the query, I am only going to use it immediately for validation purpouses.

My question is how can I do this by using XML? I already know how to use it by means of JSP but I haven't been able to find out how to make them both (jsp and xml) work together.

Thax for your answers

Starfox