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XML in Office 2003: Information Sharing with Desktop XML by Priscilla Walmsley, Charles F. Goldfarb

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Chapter 22. XML Schema (XSDL) Tad Tougher Tutorial

  • XML Schema definition language

  • Syntax and declarations

  • Simple and complex types

  • Locally-scoped elements

  • Schema inclusion

An XML DTD is a specific case of a more general concept called a schema definition. The dictionary defines schema as a “general conception of what is common to all members of a class.” A schema definition takes that “conception” and turns it into something concrete that can be used directly by a computer.

There are many types of schema in use in the computer industry, chiefly for databases. DTDs are different in that the class for which they declare “what is common to all members” is a class of XML documents.

The popularity of XML has brought DTDs to entirely new constituencies. The ...

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