Is there a way to get a XEB file from a PDF document? As I have seen, that chinese converter does not accept PDF as input but I hope I err.

i've done a huge search on the net on and off for days and the only thing i could find to make them was that chinese apabi publisher :<

What is a XEB file and what is it for?

it's a document format developed by Beijing Founder Electronics, a big maker of PCs in China.
http://www.teleread.org/blog/?p=4768