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Schematron is a useful and accessible supplement to other schema languages.The open-source XSLT implementation is based around a core framework which is open for extension and customisation.This paper provides an introduction to Schematron; an innovative XML validation language developed by Rick Jelliffe.

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Less formally, schemas are constructed by defining parent-child and sibling relationships [Jelliffe1999a]. However this means that DTDs, and similar derivatives, are unable to define (and hence constrain) the other kinds of relationships that exist amongst markup elements within a document.The Schematron conformance language for custom implementation is also introduced.The paper completes with some suggestions of possible future extensions.This comes at very little cost: XPath is available in most XML environments.For example the following types of constraint are hard, or impossible to express with other schema languages.For example, we may select all Regular grammars, as used in DTDs, can then be viewed as tree patterns where the only available axis is the parent-child axis [Jelliffe1999e].Full use of tree pattern validation provides the maximum amount of freedom when modelling constraints for a schema.A trivial XML vocabulary is introduced for the purposes of generating examples.The later sections in this paper provides an overview of the open source XSLT framework used to implement the Schematron language.As an extensible, easy to use, open source tool Schematron is an extremely useful addition to the XML developers toolkit.The initial section of this paper conducts a brief overview of tree pattern validation, and some of the advantages it has in comparison to a regular grammar approach.


  1. Abstract. Schematron Schematron is a structural based validation language, defined by Rick Jelliffe, as an alternative to existing grammar based approaches.

  2. Origin and Goals. XML was developed by an XML Working Group originally known as the SGML Editorial Review Board formed under the auspices of the World Wide Web.

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