Originally Posted by andym
I agree completely with DMcCunney.
xhtml is also the basis of the epub format, and it does seem a bit pointless to be uploading books in proprietary formats which will soon be overtaken by xhtml-based Open eBooks.
The basis yes, but you have extra information in an epub files: the TOC for example. A simple conversion software for HTML to Epub won't provide the best Epub files that you could do, that's why you need to store these books in a database or using an extended HTML.