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Re: [xml-dev] XML spec and XSD

Thanks, Mike for your remarks.

On Sat, Nov 7, 2009 at 3:59 PM, Michael Kay <mike@saxonica.com> wrote:
> It's a basic issue of architectural layering. XSD has a dependency on XML,
> XML has no dependency on XSD. Nothing in the XML spec is affected if XSD
> changes.
> It's bad enough when you're writing a spec tracking the changes in
> technologies you depend on (like Unicode). Introducing unnecessary
> dependencies for pedagogic or marketing reasons would be a very bad thing to
> do.

Looking at your view points above, I agree to them as good
architectural principles while writing W3C specs.

But I feel, that mentioning XSD as a validation technology for XML
documents, in the XML spec is perhaps a good idea since DTD is also
mentioned in the XML spec (which is also a XML validation technology).
I feel, doing so doesn't promote any pedagogic or marketing attitudes
towards XSD.

Reading the XML spec, gives us a feeling (to me at least, I guess)
that DTD is the most important technology for validating XML. Even if
we don't mention specific versions of XSD as validating language for
XML documents (in specific XML standards, like 1.0 5th edition or XML
1.1), I think it's good to mention in references of the XML spec (I
believe, a normative reference to this would also be good in the XML
spec), that XSD is also another XML validation technology from W3C,
which achieves the same task as DTDs do. I think, referring to the
link, http://www.w3.org/XML/Schema in XML specs would serve the
purpose I am suggesting.

Mukul Gandhi

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