The book's pace is aimed at beginner programmers. As befits a 'learning' book, every chapter ends with a questions and answers section.
The book reflects poor editing. The index is poor. Half of the book's content is program listings, much of which is repeated with minor changes or filled with example data. The figures are tiny, with even smaller text. Warning boxes are adopted as a means for displaying output. The text within these boxes is dense syntax displayed at 16 lines per inch on the page. Some screen displays are truncated. References occasionally have the wrong chapter numbers. The prose is repetitive, for example, we are encouraged to decouple our files in every other chapter of the book.
Overall, the book failed to impress upon me what can (and cannot) be achieved with XML; the toy examples are the only inspiration provided. I don't recommend this book.