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Re: EPUB Accessibility: Discovery of the Writing Direction (DRAFT 1.0)

From: Koji Ishii <kojiishi@gmail.com>
Date: Sat, 5 Dec 2020 20:42:58 +0900
Message-ID: <CAN9ydbVfhsb6YwdPGVvvsjy_Ck8XRuQbxrSd1QfNv4NSLyBhTQ@mail.gmail.com>
To: MURATA <eb2mmrt@gmail.com>
Cc: Jens Tröger <jens.troeger@light-speed.de>, Ivan Herman <ivan@w3.org>, W3C EPUB3 Community Group <public-epub3@w3.org>, W3C Publishing Community Group <public-publishingcg@w3.org>, Richard Ishida <ishida@w3.org>, Florian Rivoal <florian@rivoal.net>
2020年12月5日(土) 9:31 MURATA <eb2mmrt@gmail.com>:

> > The subject of this e-mail, and the attached doc, is about discovering
> the writing-mode of a document.
> >
> > The discussion, if I understand correctly, is about changing the
> writing-mode of a document.
> >
> > Which topic are we discussing?
> This thread is about discovering EPUB publications
> that can be rendered using the specified writing-mode.
> It is NOT about discovering the writing-mode of a given
> document.  To understand the differences between
> these two, please have a look at EPUB Accessibility first.
> This thread is NOT about changing the writing-mode of a
> document.  But it is assumed that alternate style tags
> of IDPF are usable.

Thank you for the clarification.

Some questions on the discoverability topic:
1. Can a publication be found for both D1 and D2 in your doc
<https://1drv.ms/w/s!An5Z79wj5AZBgtUx_1os2PNRrYkDjA?e=v9qSpH>? I think yes
for publications that can change the writing-mode but wanted to confirm.

2. If a non-switchable publication contains both writing-modes, how should
it be found? As you know, a publication may have vertical chapters but book
covers/chapter title pages/appendixes may be horizontal. Is it up to
authors which writing-mode is "primary"?

3. I remember we had a discussion on page progression direction. CSS
defines the page progression direction
<https://drafts.csswg.org/css-writing-modes-3/#page-direction>, but it is
only for an XHTML document (spine), and the page progression of a
publication may be different, or an EPUB publication may contain mixed page
progressions. Do you remember if we defined that, or did we leave it
undefined, in the current EPUB spec?

A minor point: if the word "discovery" in your doc has a specific meaning
in an existing spec, it is helpful if you can link the word to the
Received on Saturday, 5 December 2020 11:43:25 UTC

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