Part 2: Structure
Designing an XML application is an exercise in modeling a problem domain, similar in many respects to designing a class hierarchy in an object-oriented programming language or defining the tables that make up a database schema. It involves mapping a real-world system into the constructs the language makes available. In the case of XML, you map real-world information into trees, elements, and attributes. The mapping may be implicit or it may be described in a schema written in some language such as RELAX NG, DTDs, Schematron, or the W3C XML Schema Language.
Part 2 discusses the issues that arise when performing such mappings. It shows you which XML structures are appropriate for which kinds of data and which ones aren't appropriate ...
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