Re: [xml-dev] Is Schematron (using XPath 2.0) functionally a superset of

["bryan rasmussen" <rasmussen.bryan@gmail.com>]

I think in ISO Schematron content models are simple enough
http://www.oreillynet.com/xml/blog/2007/11/converting_xml_schemas_to_sche_7.html

Cheers,
Bryan Rasmussen

On Nov 9, 2007 4:58 PM, Michael Kay <mike@saxonica.com> wrote:
> >
> > Is Schematron (using XPath 2.0) functionally a superset of
> > XML Schemas?
>
> Remember that XML Schema does more than validation.
>
> Even if you're only interested in validation, then I think there are some
> rules that can be expressed in a grammar that are very hard to express in
> predicate calculus. Even simple rules like a content model of (name,
> address-line+, postcode) are very clumsy to express as XPath assertions,
> though it can be done. I don't know the answer to the theoretical question
> of whether all grammar rules can be translated into predicates, but I know
> that the answer to the practical question is that I wouldn't want to.
>
> Michael Kay
> http://www.saxonica.com/
>
>
> >
> > Using XPath 2.0, Schematron can now perform all of the
> > grammar-type checks that XML Schemas does, e.g. check that
> > the correct tags are being used, the tags are arranged
> > properly, and the datatypes of each element and attribute are
> > correct.
> >
> > Plus Schematron can perform co-constraint checks, cardinality
> > checks, and algorithmic checks that XML Schemas cannot do.
> >
> > Are there things that XML Schemas can do that Schematron (using Xpath
> > 2.0) cannot do?
> >
> > /Roger
> >
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