Part I. XML
It's important that you have a good understanding of XML, XML namespaces, and the W3C XML Schema Language before proceeding, because these technologies are fundamental to understanding SOAP and WSDL, which are the foundation of Web Services as defined by J2EE and the WS-I Basic Profile 1.0.
While most developers understand and have used basic XML, many have not used XML namespaces or the W3C XML Schema Language, so the emphasis of this first part of the book is on these two topics. Chapter 2 includes two major sections: Section 2.1: XML Primer, which you can skip if you are already familiar with basic XML concepts, and Section 2.2:
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