From: Peter Edberg (pedberg@apple.com)
Date: Thu Apr 06 2006 - 21:43:16 CST
Further investigation reveals that according to the restrictions for
main (standard) and auxiliary exemplar sets in
<http://unicode.org/cldr/data_formats.html>,
characters with a property of Default_Ignorable_Code_Point - which
includes 200C ZWNJ and 200D ZWJ - are not allowed in the main
exemplar set, period. They are only allowed in the auxiliary exemplar
set.
-Peter E
On Apr 6, 2006, at 9:58 AM, Peter Edberg wrote:
> OK, it sounds like ZWNJ "is necessary for writing Persian where
> certain afÞxes and compound words do not join" (per the first
> website below).
>
> The need for ZWJ in Persian seems more specialized, I am not sure
> it demonstrates that ZWJ is required for most uses of Persian.
>
> The Arabic examples for ZWJ and ZWNJ seem to be all for special
> display cases (and partly to work around browser-specific display
> issues), and again I would argue that these are not cases that
> should be covered by the standard exemplar set. Perhaps for Arabic,
> ZWJ and ZWNJ should be in an auxiliary characters set.
>
> The non-Arabic and non-Persian language examples (e.g. for Urdu and
> Sindhi) do not apply to the "ar" or ""fa" locales.
>
> All of this hinges on the definition of what the exemplar set is
> supposed to cover. From UTS #35 (LDML): "The exemplar character set
> contains the commonly used letters for a given modern form of a
> language... It is not a complete set of letters used for a
> language, nor should it be considered to apply to multiple
> languages in a particular country. Punctuation and other symbols
> should not be included. In general, the test to see whether or not
> a letter belongs in the set is based on whether it is acceptable in
> that language to always use spellings that avoid that character."
>
> -Peter E
>
> On Apr 6, 2006, at 12:41 AM PDT, Andreas Prilop wrote:
>> They are! See
>> http://www.unics.uni-hannover.de/nhtcapri/bidirectional-
>> text.html#zwnj
>> http://www.laits.utexas.edu/persian/persianword/zwnj.htm
>>
>> http://www.unics.uni-hannover.de/nhtcapri/bidirectional-text.html#zwj
>> http://www.laits.utexas.edu/persian/persianword/zwj.htm
>
> On Apr 5, 2006, at 5:40 PM PDT, Asmus Freytag wrote:
>> I believe that extensive discussion on the bidi list has
>> established that ZWNJ is indeed needed for Persian.
>
> On Apr 5, 2006, at 5:25 PM PDT, Michael Everson wrote (somewhat
> cryptically):
>> Please consult our Iranian colleagues on this question.
>
> On Apr 5, 2006, at 5:03 PM PDT, Peter Edberg wrote:
>> 1. Arabic (ar) & Persian (fa):
>> - Both of these include 200C and 200D (ZWNJ and ZWJ). I would argue
>> that these characters are not required in order to write Arabic or
>> Persian.
>>
>
>
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