UCAS and related scripts (was: Re: A comment on draft-faltstrom-idnabis-tables-05.txt)
John C Klensin <klensin@jck.com> Mon, 07 April 2008 16:29 UTC
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Date: Mon, 07 Apr 2008 12:29:42 -0400
From: John C Klensin <klensin@jck.com>
To: Eric Brunner-Williams <ebw@abenaki.wabanaki.net>
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Cc: Martin Duerst <duerst@it.aoyama.ac.jp>, idna-update@alvestrand.no
Subject: UCAS and related scripts (was: Re: A comment on draft-faltstrom-idnabis-tables-05.txt)
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--On Monday, 07 April, 2008 08:56 -0700 Eric Brunner-Williams <ebw@abenaki.wabanaki.net> wrote: > Thank you for writing back. > > I'm more interested in the full stop (166e in your table) than > in the symbol for a foreign cult (166d in the same text). > > I'm guessing that the rational for the full stop exclusion is > not that its "confusingly similar to" some other character, > but because it is functionally equivalent to "dot" (and is > always translated into roman script as "."). > > Which rational, or something I've not guessed, is present? Eric, There may be some exceptions, for which it is better that you check the I-Ds rather than my trying to summarize and get it wrong but, in general, we have not disallowed characters because of confusing similarity (aka "phishing risk") alone. In the case of U+166E, it is excluded because it has the Unicode General Category "Po" (other punctuation) and all such characters are Disallowed. Correctly or incorrectly, U+166D is also in "Po". If I correctly understand your comments and those of Michael Everson, it might better have been classified as a symbol of some flavor, but that would make no difference for our purposes, since symbols are also disallowed. If you haven't had time to look at the Rationale document (draft-klensin-idnabis-issues) yet, the general theme of this part of the new approach is to return to the "LDH" rule associated with traditional hostnames and then try to generalize the "letter" and "digit" parts to corresponding characters in Unicode, rather than, e.g., trying to see how much can be included without causing problems. If that formulation is working out well for indigenous North American writing systems, it suggests that the rules we are using generally worked rather than because we conducted a character-by-character examination and then invented new classifications. john
- A comment on draft-faltstrom-idnabis-tables-05.txt Eric Brunner-Williams
- Re: A comment on draft-faltstrom-idnabis-tables-0… Martin Duerst
- Re: A comment on draft-faltstrom-idnabis-tables-0… Michael Everson
- Re: A comment on draft-faltstrom-idnabis-tables-0… Eric Brunner-Williams
- UCAS and related scripts (was: Re: A comment on d… John C Klensin
- Re: UCAS and related scripts (was: Re: A comment … Michael Everson
- Re: UCAS and related scripts Eric Brunner-Williams
- Re: UCAS and related scripts Eric Brunner-Williams
- Re: A comment on draft-faltstrom-idnabis-tables-0… Martin Duerst
- draft-faltstrom-idnabis-tables-05.txt: 166D and 1… Patrik Fältström
- Re: draft-faltstrom-idnabis-tables-05.txt: 166D a… Eric Brunner-Williams