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Re: [precis] names and usernames

Martin J. Dürst <duerst@it.aoyama.ac.jp> Mon, 27 February 2017 04:30 UTC

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To: John C Klensin <john-ietf@jck.com>, Peter Saint-Andre <stpeter@stpeter.im>, precis@ietf.org
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From: "Martin J. Dürst" <duerst@it.aoyama.ac.jp>
Organization: Aoyama Gakuin University
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Date: Mon, 27 Feb 2017 13:30:18 +0900
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Subject: Re: [precis] names and usernames
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On 2017/02/27 10:26, John C Klensin wrote:

>>>>> or assigns in the BMP but as
>>>>> compatibility decomposable characters (and thus disallowed
>>>>> by RFC 7564 in the IdentifierClass).

There are many different reasons for a character to have a compatibility 
decomposition. The oldest Unicode data file, 
http://www.unicode.org/Public/UCD/latest/ucd/UnicodeData.txt, even 
contains labels for these. But having looked again through the list of 
these labels, excluding them seems very appropriate in all cases.

>> My correspondent said it should be fine to disallow
>> compatibility decomposable characters such as U+328A (CIRCLED
>> IDEOGRAPH MOON) because according to him they would not be
>> used in given or family names.

This would be indeed about as weird as using using circled letters in a 
Western name. In Unicode, circled moon is followed by circled fire, 
water,... It's very clear that these are specific 'styles' for the days 
of the week in Japanese (not in Chinese, don't know about Korean).

Regards,   Martin.

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