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Having highlighted the fact that the existing schema paradigm can only express constraints among data items in terms of the child and sibling axes, it is natural to consider whether an alternate paradigm might allow a schema author to exploit these additional relationships to define additional types of constraint amongst document elements.
Tree patterns do just that, and XPath provides a convenient syntax in which to express those patterns.
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].
Tree patterns, defined as XPath expressions, are used to make assertions, and provide user-centred reports about XML documents.
Expressing validation rules using patterns is often easier than defining the same rule using a content model.
The element: 'Intr Bk Sttlm Amt' has an invalid value according to its data type. NOTE I am restricted to using VB6 & cannot add any new project references, (hence the late binding in the code below). I've never seen any XML validating program that was able to list all the errors because the first error that it encounters probably interferes with the XML parser in a way that doesn't enable the parser to correctly parse the file. The code you sent me works OK and gives me exactly what I want.
Have you tried using any other XML tools to validate the XML in question? Unfortunately this code would require me to add a reference, (xml4.0), which isn't allowed in my development environment.
The Schematron conformance language for custom implementation is also introduced.
I'll post a comment here if I have any luck with this.
Abstract Schematron [Schematron] is a structural based validation language, defined by Rick Jelliffe, as an alternative to existing grammar based approaches.
The use of XML syntax provides additional flexibility through leveraging existing tools for markup manipulation, while the 'value added' features satisfy the requirements of developers looking for closer integration with databases and object-oriented languages.
Yet the fundamental approach adopted by these languages does not diverge greatly from the DTD paradigm: the definition of schemas using regular grammars.
The Schematron language is then discussed, covering all major elements in the language with examples of their usage.