Yes, they did. I saw the XML and it didn't look much different from well-written HTML. The amount of markup you need for a book is fairly minimal: h1, h2, p, b,

Yes, they did. I saw the XML and it didn't look much different from well-written HTML. The amount of markup you need for a book is fairly minimal: h1, h2, p, b, i, c (code font), ix (index entry). Think of it as a customizable HTML.