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An overview of the architecture, with a view to producing customised versions is also provided.
This paper provides an introduction to Schematron; an innovative XML validation language developed by Rick Jelliffe.
Full use of tree pattern validation provides the maximum amount of freedom when modelling constraints for a schema.
This comes at very little cost: XPath is available in most XML environments.
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.
Yet the fundamental approach adopted by these languages does not diverge greatly from the DTD paradigm: the definition of schemas using regular grammars.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.Other tutorial materials fulfill these roles already [Holman],[XPath],[XSLT] ,[Ogbuji C],[Ogbuji U].During the last few years a number of different XML schema languages have appeared as suggested replacements for the ageing Document Type Definition (DTD).The majority of these have taken the basic premise of recasting DTD functionality in XML syntax with the addition, in some cases, of other features such as data typing, inheritance, etc [XMLSchema].
While XML does include an ID/IDREF mechanism which allows for cross-referencing between elements, and hence another form of relationships, it only weakly binds those elements.