Hi Luc,
Here’s the latest post from Takami-san on the Github for EPUBCheck.
Please refer to them and make use of them for discussing with EPUB 3 CG.
Best,
Daihei
(Takami-san’s comments and the examples)
> I could gather samples and usecases of TOC regulation-violated EPUBs in Japan.
>
> We found many samples in magazines or specialized books.
>
> [Low prioritised Contents like Columns]
>
> Many cases were reported for treating columns (small piece of content or additional content in the book).
>
> Such low prioritised contents are sometimes located in the last of NavDoc because it's easy to access to the main chapters by skipping.
>
> A similar case was found in the traveling guide book that small maps in the page were treated as the same as columns.
>
> On the other hand, we found the case of bonus content which is placed next of TOC in NavDoc (actual content is located in the last) in order to appeal such special content is bundled.
>
> [Another index in Cooking Book]
>
> We found the case in cooking books that the first TOC sorted by types of genres like meat, fish, soup etc. was placed by the order of chapters and the second TOC sorted by types of materials like tomato, egg, milk etc. was also placed additionally for better experience of searching recipes.
>
> This multiple index feature should be discussed in the future to enhance capability of eBooks, I think.
>
> [Magazine of Mangas]
>
> Magazines for Manga contents are popular in Japan and TOC page tends to be located in the last chapter, after Manga chapters, and we sometimes move it to the top level area when generating eBooks in order to make it easy to find TOC.
>
> [Magazine of Novels]
>
> See attached TOC image (modified for content protection).
>
>
> In this case, chapters are grouped by types and content of from page 022 is located in the columns section.
>
> This is a kind of sample of paper book and we have to generate out-of-order NavDoc in EPUB for reproduction of the paper book.
>
>
>
