Xml
Understanding Web Services: XML, WSDL, SOAP, and UDDI
Format: Paperback
Author: Eric Newcomer
ReleaseDate: 13 May, 2002
Publisher: Addison-Wesley Professional
Rating:
Pretty good overview 
Bottom line is that i6t would be easy to wal away from this book thinking web services is simply xml schema--and miss the bigger picture. This book provides a pretty good overview of web services--although it's a little heavy handed with xml.
Good coverage, difficult read
You are not going to sit down and write code from this book, but it does help to define all of the pieces of web services technology and get you started. I have been thrown into the web services technology without a parachute and this book has helped to put things into perspective. With that said, this was a difficult book to read because the writing style is very abrupt, does not flow, and reads like an old style academic textbook trying to impress and confuse the student. I've read more technical books that were easier to understand because they explain their subjects in more natural prose. I found myself frequently reading pages over one or more times.
Excellent overview book on the data side of XML 
It is the first excellent (and mature) one I read so far. This book is about the data side of XML as opposed to the document side. It gives a thorough introduction to all relevant subjects. Its chapters are often more helpful than an entire book devoted solely to the chapter topic. Especially helpful I found a lot of explanations for seemingly simple or trivial things that nobody else explained and I admittedly did not dare to ask.
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