XML syntax of JSP problem

First of all, thanks for support XML syntax of JSP.
few problems I noticed:
1. if in jsp:root tag I don't set attribute xmlns (xmlns="http://www.w3.org/1999/xhtml" for example) shouldn't I be allowed to use any valid XML, not only XHTML. Not all JSP used to generate HTML or XHTML.
2. it would be very nice if I could use .JSP extension for both traditional JSP and XML JSP.

Thanks,
Zhenya