Quote:
Originally Posted by kovidgoyal
The important point here is that the two modes restrict each other.
A tagged PDF cannot support all the typographical niceties of an untagged PDF, nor can it support all the features of a dedicated reflowable format. Tagged PDF is a compromise that adobe bolted on to PDF to try and make it work for accessibility and ebook applications. Why do you think Adobe is developing epub if tagged PDF was any good as an ebook format?
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To sell a program to make the files. Insight I believe. epub was not developed by Adobe but a standard that grew out of the original Rocket eBook format source files which are also used by Microsoft and to some extent by Mobi although they came late and only bolted on support. Digital Editions will also read pdf by the way. I am not saying the PDF is the greatest eBook format in existence. I am just say that it can be made to work but the current software in eBook devices doesn't even try.
There are lots of eBook formats with significant problems technically but they are still eBook formats. PalmDoc is really poor but it still popular. TXT is a poor eBook format also but look at how much effort there is making books in that format.
Dale