O'Reilly News & Commentary

Schema coverage report - SVRL to XSL and Ant

By Rick Jelliffe
October 23, 2010

You have a large or complex Schematron schema and it produces no errors. How do you know it is working? A coverage report lets you see how many of each Schematron rule was fired when checking the document(s). The report...

Do you need to make your own XSLT2 function definitions when using Schematron?

By Rick Jelliffe
September 27, 2010

Recently I have seen some Schematron schemas written by good XSLT programmers which basically represented all assertion tests as custom XSLT2 functions. (Schematron allows this.) The schemas were successful, in that they functioned as desired, but I don't think there...

Schema languages as if annotation mattered - with more on Operator Grammars

By Rick Jelliffe
July 26, 2010

In 2001 we had an interesting exchange about schema languages on the XML-DEV mail list. I had written Are we losing out because of grammars?. What do I think of it now? Four heads: disconnection, importance, a category error, and operator grammars.

Validating Operator Grammars in Schematron

By Rick Jelliffe
July 21, 2010

Operator Grammars is a linguistic theory that we can adopt (or be inspired by, or perhaps dumb-down) for validation purposes. We don't need more information than is in the Wikipedia summary: we want to suggest Schematron features that can handle...

ZVON: the Information Plunger

By Rick Jelliffe
July 9, 2010

I see the ZVON.org site has recently been renovated. It is a great site with tutorials or reference material on dozens of Web-related topics. Highly recommended. The site slogan is ZVON.org cleaning information pipelines but the logo says ZVON the...

Highly Generic Schemas - A schema is like an aircraft: it can be designed for stability or maneuverability but not both.

By Rick Jelliffe
July 7, 2010

Developer Christophe Lauret recently commented: "A schema is like an aircraft: it can be designed for stability or maneuverability but not both." I recently have been trying a different method for designing intermediate schemas in publication chains. It is an exercise in taking the three-layer model for XML with Schematron to an extreme. The best name I can think of this is Highly Generic Schemas.

Ruby Schematron

By Rick Jelliffe
June 4, 2010

Francesco Lazzarino has a project up at RubyForge for a Ruby runner for ISO Schematron. (Open source: MIT/ Consortium License) Schematron is a small ISO-standard language for making assertions or reports about patterns in and between XML documents, typically using...

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