Validating url in java

Tree patterns are the schema paradigm underpinning Schematron as a validation language.There are reasons to believe that tree-pattern validation may be more suitable in an environment where documents are constructed from elements in several namespaces (often termed 'data islands').This is followed by an outline of Schematron and the intended uses which have guided its design.

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An overview of the architecture, with a view to producing customised versions is also provided.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.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.

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