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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.
The general intent behind this paper is to furnish the reader with a broad overview of both Schematron and its approach to validation.
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.
A trivial XML vocabulary is introduced for the purposes of generating examples.