By page 177 I realized that I was never going to touch a keyboard while reading this book. I can't speak for everyone, but when I pick up a book expecting to learn the topic, I need theory, reference, examples and structured "assignments". This title offers the first three, but I never get to apply what I am learning hands-on in a graduated fashion. When I am finished, I have little more than the ability to recognize the components of XML. Just because you can recognize all the foods in a grocery store, and know the origins of all the spices on your spice rack, doesn't mean you can cook; the same principal applies here. I am fully aware that XML is comprised of many different elements, and many of the XML development environments are very expensive, but many are free and could have been used to teach the concept clearer.
The title also has many errors, so the errata list on the publisher's web site is important. The book does not include any of the source code, so if you want that, you have to download it. Even then, it is not complete and file titles in the book do not always match the provided code file names.
If you are looking for a hands-on book to learn XML, this isn't the title. If you know XML and are looking for a reference, again - not for you. However, if you are interested in it from more of an administrative overview position, then the title is worth the read. It can provide many answers and give a good base of information without the need to actually write any XML on your own.