full schema for signing request, dss-proposal-rsalz-02.xsd

I knocked most of this off earlier, but then I ran it through IBM's
schema quality checker which found various typo's, etc.

Looking forward to feedback.
        /r$
--
Rich Salz                  Chief Security Architect
DataPower Technology       http://www.datapower.com
XS40 XML Security Gateway  http://www.datapower.com/products/xs40.html
XML Security Overview      http://www.datapower.com/xmldev/xmlsecurity.html