Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Confusing and poorly organized.

This book is a classic example of how [at least some] techies can't express themselves very well to non-techies. The examples don't work the way the author says they should (I've confirmed one example of this with Microsoft Press, whose rep couldn't figure it out, either), and worse, the author slides sideways into very technical discussions about concepts that haven't yet been defined. The accompanying CD comes with so little explanation that it only makes an already confusing situation worse. If you're trying to learn XML on your own, there has got to be a better choice than this.