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Definitive XML Schema, Second Edition by Priscilla Walmsley

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Chapter 22. Extensibility and reuse

Sometimes we forget that the “X” in XML stands for “eXtensible.” One of the beauties of XML is that additional elements and attributes can appear in an instance without affecting the core information. Specialized requirements for particular applications, industries, or organizations can be addressed using extensions.

However, in order to make XML extensible, you need to leave avenues open to do that. If you write schemas and applications that require very strict validation of an instance, the major benefit of XML is not realized! This chapter provides detailed recommendations for developing schemas that will be reusable and extensible in the future. It also provides guidelines for extending existing schemas. ...

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