In order to keep my precarious web development job, I decided to learn XML - everyone's been talking about it for a while. As I usually do when I need to learn a new subject, I buy about a half dozen books on the subject. This book was one of those half-dozen. Suffice it to say that I returned the other five. Seriously, it's that good. It assumes nothing about your prior knowledge, and takes you step-by-step from simple XML into DTDs, XML Schema, XSLT, XHTML, and more. The content is solid and the writing style is friendly, conversational, and intelligent.