oXml DB Question

I have a stored procedure on my database server.  Using the db
extensions is it possible to call the stored procedure with oXML?  The
documentation web page mentions the <db:execute> but doesn't give a
complete example.  Such as how do you define the datasource when using
this method?  Anyway, if anyone is reading this that knows if this is
possible can I get a short example?  Thanks.

Mike