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Definitive XML Schema, Second Edition by Priscilla Walmsley

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Chapter 4. Schema composition

It is convenient to think of a schema as an individual schema document. However, in XML Schema, a schema can be composed of components defined in one or more schema documents. This chapter explains how schema documents are assembled together to represent a schema through various mechanisms, including those built into XML Schema and processor-specific handling.

4.1. Modularizing schema documents

Breaking a schema document into multiple documents has a number of advantages such as promoting reuse, easing maintenance, and providing more granular access or versioning. The modularization can be based on subject areas, areas of responsibility, or the likely containers of reuse. How best to do it is a design decision that ...

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