[Kralik]

Originally Posted by jgray

While the page numbers on the side are definitely an ADE thing, the dictionary and annotation support are not specified in the epub spec, as they are in LIT. Ectaco integrated their own dictionary product into the jetBook.

There is an entire thread on MR about requesting official dictionary support in epub. That way, more readers can support dictionaries and there will be interoperability for purchased dictionaries. LIT and Mobi put dictionaries in their specs, which is why you can still buy various dictionaries in those formats. Now if only the IDPF will do something about epub.

Thanks for the clarification.