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Abstract Schematron [Schematron] is a structural based validation language, defined by Rick Jelliffe, as an alternative to existing grammar based approaches.Tree patterns, defined as XPath expressions, are used to make assertions, and provide user-centred reports about XML documents.
This innovation stems from selecting an alternative approach to validation than existing schema languages: Schematron uses a tree pattern based paradigm, rather than the regular grammars used in DTDs and XML schemas.
Tree patterns do just that, and XPath provides a convenient syntax in which to express those patterns.
Validation using tree patterns is a two-step process: Both the candidate object selection, and the assertions can be defined in terms of XPath expressions.
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.
The Schematron conformance language for custom implementation is also introduced.
The paper completes with some suggestions of possible future extensions.The general intent behind this paper is to furnish the reader with a broad overview of both Schematron and its approach to validation.It does not provide a detailed tutorial of the language, although all major elements are discussed, and assumes that the reader is already familiar with XPath, XSLT, and XML DTDs.Expressing validation rules using patterns is often easier than defining the same rule using a content model.Tree patterns are collected together to form a Schematron schema.Schematron is a useful and accessible supplement to other schema languages.