----- Original Message -----
From: <DougEwell2@cs.com>
To: <unicode@unicode.org>
Cc: <marco.cimarosti@essetre.it>; <texin@progress.com>; <decoy@iki.fi>
Sent: den 29 december 2001 08:47
Subject: Re: Vertical scripts (was: Tategaki (was: Re: Updated...))
> 1. Horizontal, that is, left-to-right (LTR) versus right-to-left (RTL).
> 2. Vertical, that is, top-to-bottom (TTB) versus bottom-to-top (BTT).
> 3. Priority of direction (e.g. (LTR, TTB) versus (TTB, LTR)).
> [...]
> An elaboration of the directional override mechanism to handle vertical
> directionality would have to take priority into account as well. Instead
of
> two directionalities, LTR and RTL, the Unicode Standard would have to
> consider eight. The Bidirectional Algorithm might have to become
> Octodirectional, with a commensurate increase in complexity. Perhaps this
is
> the problem that is avoided by declaring vertical directionality to be a
> higher-level "formatting style" issue. But it still seems arbitrary.
Someone said that Unicode contains switches for LTR & RTL. By adding
switches for TTB and BTT this problem could be solved. It would also be
necessary to define a priority order (i.e. which of them that should come
first).
As an alternative solution, the current switches could be considered LTR,
TTB and RTL, TTB. Then 6 other code points would be necessary for the other
directions.
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This archive was generated by hypermail 2.1.2 : Sat Dec 29 2001 - 05:33:41 EST