From: Peter Constable (email@example.com)
Date: Fri May 14 2004 - 12:55:31 CDT
> From: E. Keown [mailto:firstname.lastname@example.org]
> For a small percentage of early Semitics stuff, it
> would be convenient to be able to automatically
> reverse the direction in a database, so the retrieval
> algorithm could look at 'both directions.'
It's not clear to me what you have in mind. The directionality issue
exists only when text is displayed. In a database, all text is linear
from logical beginning to end, and without any spatial direction. The
linear sequence may contain layout control characters such as RLE
(U+202B) that will affect how display processes operate, but I wouldn't
expect a retrieval algorithm to be particular interested in those layout
controls. For a given piece of text "abc", does it matter to you whether
in the source manuscript / tablet / whatever "abc" occurred in a RTL run
vs. a LTR run? If not (which is what I suspect), then it will work the
way you want without any extra work.
> Is there a larger 'boustrophedon' note in Unicode 4.0?
> Is there any interest in expanding the bidi algorithm
> to definitely cover all possible RTL - LTR
> boustropheda (plural?) ?
No; any directionality issues beyond the mixing of directions within a
*single* line is considered out-of-scope for Unicode, and are to be
handled by higher-level specifications and mechanisms, such as document
> I assume that there is *no* complete list online of
> all possible writing direction configurations.
The obvious possibilities are obvious. The others are unlikely, but also
not enumerable. I don't know of any comprehensive list; perhaps others
> The discussion so far on the list doesn't appear to me
> to cover every possibility....my impression is that
> there are probably sub-varieties of boustrophedon
Sure: in the alternate lines, is the orientation of equivalent
characters the same? mirrored? rotated? other?
Globalization Infrastructure and Font Technologies
Microsoft Windows Division
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