Re: arabic number in bidi algorithm

From: Chookij Vanatham (
Date: Thu Oct 28 1999 - 16:52:45 EDT


Thanks all for information.
I think I found something. It would be a little bit of wrong typo in
Table 3-7 "Bidirectional Character Types" of this paper.
Category Type Description Scope
Strong AL Right-to-Left Arabic Arabic, Thaana, ....
                                         ... ranges (0600-07BF <-- Wrong typo.
I just found that the techincal report says "Arabic-Indic digit (0660-0669)" is
actually Weak type. It's AN. (according to the technical report).

Seems to be that Weak Type of Arabic-Indic digit does make sense due to there
is the situation where the digits are used for as non-numeric, like name.
If the direction of arabic-indic digits is not what users want, users can
control the direction by using LRE/LRO/RLE/RLO.

Thanks all again.

Chookij V.

] Date: Thu, 28 Oct 1999 13:18:19 -0700 (PDT)
] From: Mark Leisher <>
] Subject: Re: arabic number in bidi algorithm
] To: Unicode List <>
] Cc: Unicode List <>
] MIME-version: 1.0
] Content-transfer-encoding: 7bit
] Content-transfer-encoding: 7bit
] Chookij> According to the Bidi algorithm, the arabic number (U+0671 -
] Chookij> U+0679) has the strong type, RIGHT-TO-LEFT. So, regardless of RLO
] Chookij> and RLE, can I say that the arabic number (U+0671 - U+0679) would
] Chookij> be always written from RIGHT to LEFT. This is confused me due to
] Chookij> I see that, in miscrosoft word (arabic version), the arabic
] Chookij> number is written from LEFT to RIGHT.
] Chookij> May be someone can let me know which one is right or I miss
] Chookij> anything ?
] The digits in the Arabic block, U+0660-U+0669 and U+06F0-U+06F9, all have weak
] directionality. Visually they generally appear left-to-right.
] -----------------------------------------------------------------------------
] Mark Leisher
] Computing Research Lab I have never made but one prayer to God,
] New Mexico State University a very short one:
] Box 30001, Dept. 3CRL "Oh Lord, make my enemies ridiculous."
] Las Cruces, NM 88003 And God granted it. -- Voltaire, letter

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