I don't like it. EPUB should be as simple as possible, so we may have simple programs to parse/render it on universal devices (ex. PCs/tablets) and cheap (inclu

I don't like it. EPUB should be as simple as possible, so we may have simple programs to parse/render it on universal devices (ex. PCs/tablets) and cheap (including DYI) specialized book readers. It is quite complex already, and making it into portable document format will just make an order of magnitude more complex.