Rating: 

My principal complaint was that they had no coverage of XML Schema, despite the books publication date Jan 2001. The book conveyed the impression that the ageing and inadequate DTD was the one and only validation mechanism. IMO, this is a serious and misleading omission that detracts from the quality of the book.

My other concern was the seeming overlap between the reference and tutorial material for each topic, which are separately packaged in different ends of the book, but seem somewhat similar and not particularly complimentary. More annotated examples in the tutorial sections would have helped.