This is rather cool. I read through the article and went through step by step and played around a bit afterwards and made my XML look pretty. I may just have to start looking into this more. It has real application in trying to separate content and design, which as we all know, is the web design dilemma.
We know that XHTML is XML, but it’s not used by most Web designers on a day-to-day basis. Its importance and usefulness aren’t even fully understood by most developers. Unless you’re familiar with a server-side technology where the power of XML has been utilized, you might find XML’s purpose a little ambiguous.
Links of Interest:
Learn XML in 30 Minutes
Getting started with XSLT and Path
Wandering the Interwebs 