Re: [Idna-update] Genart telechat review of draft-faltstrom-unicode11-08
Martin J. Dürst <duerst@it.aoyama.ac.jp> Wed, 20 March 2019 05:19 UTC
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From: "Martin J. Dürst" <duerst@it.aoyama.ac.jp>
To: "Asmus Freytag (c)" <asmusf@ix.netcom.com>
CC: "idna-update@ietf.org" <idna-update@ietf.org>
Thread-Topic: [Idna-update] Genart telechat review of draft-faltstrom-unicode11-08
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Date: Wed, 20 Mar 2019 05:19:41 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idna-update/iJVMY3nCyYwfGq3vCwfbqmQSixg>
Subject: Re: [Idna-update] Genart telechat review of draft-faltstrom-unicode11-08
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Sorry I forgot to mention it, but I think the change of the Unicode property for U+19DA NEW TAI LUE THAM DIGIT ONE happened because the General_Category value "Nd" was tightened to only apply to consecutive decimal digits that start with zero. See https://www.unicode.org/versions/Unicode12.0.0/ch04.pdf, page 175: >>>> The Numeric_Type = Decimal property value (which is correlated with the General_Category = Nd property value) is limited to those numeric characters that are used in decimal-radix numbers and for which a full set of digits has been encoded in a contiguous range, with ascending order of Numeric_Value, and with the digit zero as the first code point in the range. >>>> Either the tightening must have happened in the 6.0.0 timeframe, or U+19DA NEW TAI LUE THAM DIGIT ONE was originally classified wrongly. Anyway, the DNS doesn't need decimal digits to be in a contiguous block starting with zero. Regards, Martin. On 2019/03/20 13:39, Martin J. Dürst wrote: > Hello Asmus, > > On 2019/03/20 01:24, Asmus Freytag (c) wrote: >> On 3/19/2019 3:19 AM, Martin J. Dürst wrote: >>> In the 6.0.0 timeframe, there were both more actual changes (3), and >>> there was one change where we moved from PVALID to DISALLOWED, which I >>> personally think is the tougher one (see >>> https://tools.ietf.org/html/rfc6452#section-1.3). And looking at the >>> code chart athttps://www.unicode.org/charts/PDF/U1980.pdf, one may even >>> reasonably argue that keeping U+19DA NEW TAI LUE THAM DIGIT ONE would >>> have been the better choice, because when one compares U+19B1 NEW TAI >>> LUE VOWEL SIGN AA and U+19D1 NEW TAI LUE DIGIT ONE and finds them having >>> (at least on first approximation) the same glyph shape, one can easily >>> guess that U+19DA NEW TAI LUE THAM_DIGIT_ ONE is used (this is only a >>> quick conjection which would have to be confirmed) exactly in situations >>> where the distinction between letters and digits is important, of which >>> we know domain names are a good example. >> >> Here's a telling example of how a formal problem can be practically >> irrelevant: >> >> I looked up New Tai Lue on Omniglot: >> >> "The new script is used exclusively in Jinghong, so could be called the >> New Jinghong Tai Lue script, and is used for shop and street signs. >> *Fe**w people can read it*. " (Emphasis mine). >> >> If you read the full text you get the impression that the whole script >> represents a failed state-imposed "simplification". Unicode still needs >> to encode it, so that archival texts from the period between 1950 and 1980 >> can be encoded, but it's surely of no practical relevance for domain names. > > Interestingly enough, their page (at > https://omniglot.com/writing/tailue.htm) shows the U+19DA NEW TAI LUE > _THAM_ DIGIT ONE glyph rather than the U+19D1 NEW TAI LUE DIGIT ONE > glyph in the Numerals section. > > Regards, Martin. > _______________________________________________ > IDNA-UPDATE mailing list > IDNA-UPDATE@ietf.org > https://www.ietf.org/mailman/listinfo/idna-update >
- Re: [Idna-update] Genart telechat review of draft… John C Klensin
- Re: [Idna-update] Genart telechat review of draft… Patrik Fältström
- Re: [Idna-update] Genart telechat review of draft… Asmus Freytag
- Re: [Idna-update] Genart telechat review of draft… Martin J. Dürst
- Re: [Idna-update] Genart telechat review of draft… Asmus Freytag (c)
- Re: [Idna-update] Genart telechat review of draft… Michel Suignard
- Re: [Idna-update] Genart telechat review of draft… Martin J. Dürst
- Re: [Idna-update] Genart telechat review of draft… Martin J. Dürst
- Re: [Idna-update] Genart telechat review of draft… Martin J. Dürst
- Re: [Idna-update] Genart telechat review of draft… Asmus Freytag