Beta schematron validadator of XML Schema schemas available {was Re: XML Schema: New Public Working drafts available)

Rick Jelliffe ricko at
Sun Dec 19 16:24:15 GMT 1999

 From: Henry S. Thompson <ht at>

>On behalf of the XML Schema Working Group we are pleased to announce
>the release of new Public Working Drafts for XML Schema: Structures [1]
>and XML Schema: Datatypes [2].

I have made a Schematron that validates XML Schemas.  The beta is
available under

Note that this just validates XML Schemas, it does not use XML schemas
to validate other documents.

The XML Schemas language has a lot of structural
constraints that a grammar-based system cannot check: for example
there are many instances where the value of an attribute restricts
the content model, or to check that the top-level element of
an included schema (i.e., an external file) has the correct
element type. (The fact that Schematron can handle these
better than XML Schemas is no big deal: it does show that XML
Schemas is targeted at databases and Java data rather than
being particularly optimised for validating W3C specifications. )

To use it, you will need James Clark's XT and a Schematron
implementation: I suggest schematron-report from the same
site, which gives a nice display of messages linked to the
context element where the error is in effect.

A few provisos: namespaces not supported and some sub-subtyping
errors will not be caught.

Rick Jelliffe

xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev at
Archived as: and on CD-ROM/ISBN 981-02-3594-1
To unsubscribe, mailto:majordomo at the following message;
unsubscribe xml-dev
To subscribe to the digests, mailto:majordomo at the following message;
subscribe xml-dev-digest
List coordinator, Henry Rzepa (mailto:rzepa at

More information about the Xml-dev mailing list