I think you're right, but where do you want the attribute? In the XSC:XSchema
element, or in the element declarations themselves? The XSC:XSchema solution
would only allow you to define one root element (you could go to NMTOKENS, of
course), while the element solution is messier but allows multiple possible
root elements for authoring.
Simon St.Laurent
Dynamic HTML: A Primer / XML: A Primer / Cookies