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This article contains summaries, excerpts, and examples from Chapter 14 of The XML Schema Complete Reference, Cliff Binstock, Dave Peterson, Mitchell Smith, Mike Wooding, Chris Dix, published by Addison-Wesley, 2002. Please see the book for far more explanation, greater details, and numerous examples.
Also, please visit http://www.XMLSchemaReference.com, which directly supports the book, and provides many online pointers, reference tables, and examples.