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Building Web Services with Java: Making Sense of XML, SOAP, WSDL, and UDDI, Second Edition by Claudia Zentner, Dieter König, Paul Fremantle, Yuichi Nakamura, Peter Brittenham, Glen Daniels, Simeon Simeonov, Doug Davis, Steve Graham

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2. XML Primer

SINCE ITS INTRODUCTION IN 1998, Extensible Markup Language (XML) has revolutionized how we think about structuring, describing, and exchanging information. The ways in which XML is used in the software industry are many and growing. Certainly for Web services the importance of XML is paramount; all key Web service technologies are based on it.

One great thing about XML is that it’s constantly changing and evolving. However, this can also be its downside. New problems require new approaches and uses of XML that drive aggressive technological innovation. The net result is a maelstrom of invention—a pace of change so rapid that it leaves most people confused. To say that you’re using XML is meaningless. Are you using DTDs or XML Schema ...

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