Remembering the Future

An Introduction to Schematron The Schematron schema language differs from most other XML schema languages in that it is a rule-based language that uses path expressions instead of grammars. This means that instead of creating a grammar for an XML document, a Schematron schema makes assertions applied to a specific context within the document. If the assertion fails, a diagnostic message that is supplied by the author of the schema can be displayed. One advantages of a rule-based approach is that in many cases modifying the wanted constraint written in plain English can easily create the Schematron rules.