Originally Posted by thadmc
Have you seen any discussion of whether ONIX-style metadata should be stored within an epub file or kept as a separate file? Thanks.
I hadn't heard of ONIX, and after a short amount of googling, I am of the opinion that ONIX is a completely separate standard of ebook metadata. So, I don't know the answer to your question. However, an epub file is simply a zip file with a different extension, so you could certainly put the ONIX info in a file and put it inside the epub file. It's just that no current program would know what to do with it!