XSL-like DTD

After reading the paper bellow, just a quick thought.
Is there any reason why XSLT-like validator would not be feasible?

XSLT is very powerful, you do not need to learn a new syntax as XSL will
be commonplace in a couple of years. We could do calculations inside
XSL-DTD, we could have a very fine control over document structure, ...
.

Don Park wrote:
> 
> Rick,
> 
> I completely agree with your conclusion.  DTD [expletive deleted], XML-Schema is only
> marginally better, we need something more flexible.  You might be interested
> in reading an interesting paper Dave Raggett (the HTML 4.0, Tidy guy) wrote
> that includes your 'parent model' idea.  The paper is at:
> 
> http://www.w3.org/People/Raggett/dtdgen/Docs/
> 
> I wouldn't mind having this 'Assertion Grammars' replace the current
> XML-Schema proposal.  Frankly, I am tired of tip-toeing around what W3C
> thinks is the right way of doing things.
> 
> I had a great time reading it and I am sure it will definitely shake some of
> you up.  It is a must read for everyone.
> 
> Best,
> 
> Don Park    -   mailto:donpark@xxxxxxxxxxxxx
> Docuverse   -   http://www.docuverse.com
> 
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