> I would certainly like to be able to declare in a DTD that
> certain elements are valid roots and others are not.
> Assuming there is technology to validate a document against
> an XSchema, it moves one more validity check out of my
> application and into the schema.
>
> In the DTDs I have written, very few of the element types
> (often just one) are valid roots, so my own choice of
> default would be INVALID.
Not me - conversion work of legacy data routinely involves pulling documents to
pieces, working on a fragment (such as a table) then putting it all back
together. A language such as OmniMark will allow you to find fragments without
parsing the data around it - under those circumstances, what is proposed is
unduly restrictive.
-- RegardsMarcus Carr email: mrc@allette.com.au _______________________________________________________________ Allette Systems (Australia) email: info@allette.com.au Level 10, 91 York Street www: http://www.allette.com.au Sydney 2000 NSW Australia phone: +61 2 9262 4777 fax: +61 2 9262 4774 _______________________________________________________________