Re: [apps-discuss] Review of draft-ietf-appsawg-file-scheme
John C Klensin <john-ietf@jck.com> Tue, 10 May 2016 16:06 UTC
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Date: Tue, 10 May 2016 12:06:28 -0400
From: John C Klensin <john-ietf@jck.com>
To: "Martin J. Dürst" <duerst@it.aoyama.ac.jp>, Julian Reschke <julian.reschke@gmx.de>, Matthew Kerwin <matthew@kerwin.net.au>
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Cc: IETF Apps Discuss <apps-discuss@ietf.org>, draft-ietf-appsawg-file-scheme@ietf.org
Subject: Re: [apps-discuss] Review of draft-ietf-appsawg-file-scheme
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--On Tuesday, May 10, 2016 19:19 +0900 "Martin J. Dürst" <duerst@it.aoyama.ac.jp> wrote: > In general, NFC gives you a higher chance for a match that > NFD. The Mac filesystem uses (mostly) NFD internally, but is > able to handle NFC. On the other hand, Windows and Linux don't > do normalization inside the file system, but the chances that > files were created in NFC is higher than for NFC. Agreed. But note that this is partially an artifact that illustrates why the i18n / "multilingual" versus localization issues are important. NFC gives a higher chance for a match, especially with strings that are not systematically normalized because, if one is using a keyboard designed for a particular language or location, that keyboard is likely to support locally-used characters and hence far more likely to product precomposed characters than combining sequences. The same is generally true when people select characters from some sort of online character-picker, assuming the precomposed forms exist at all. On the other hand, if I'm an experience user of one script trying to use a keyboard designed for a wildly different script or one with too many distinct character forms ("graphemes" or "grapheme clusters") to allow single-stroke arrangements to work well, all bets are off. For some scripts, there are also what look from the outside like internal consistency problems with Unicode: for example, NFD is more internally consistent then NDC because many recently-added precomposed characters decompose under NFC rather than composing. And some don't, leading to some of the problems that led to the "non-decomposable character" mess that led to the LUCID BOF and the IETF's apparent paralysis about Unicode 7.x. It is hard to say something in cases like this that will always deliver the best, or even the most-expected, results. john
- [apps-discuss] Review of draft-ietf-appsawg-file-… Dave Crocker
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Murray S. Kucherawy
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Matthew Kerwin
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Matthew Kerwin
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Graham Klyne
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Graham Klyne
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Graham Klyne
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Graham Klyne
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Graham Klyne
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Graham Klyne
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Graham Klyne
- [apps-discuss] Experimental (was - Re: Review of … Dave Crocker
- [apps-discuss] Implementation (was - Re: Review o… Dave Crocker
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Dave Crocker
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… t.petch
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… t.petch
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… t.petch
- Re: [apps-discuss] Experimental (was - Re: Review… John Levine
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Matthew Kerwin
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Matthew Kerwin
- Re: [apps-discuss] Experimental (was - Re: Review… Dave Crocker
- Re: [apps-discuss] Experimental (was - Re: Review… Mark Nottingham
- Re: [apps-discuss] Experimental (was - Re: Review… Matthew Kerwin
- Re: [apps-discuss] Experimental (was - Re: Review… Dave Crocker
- Re: [apps-discuss] Experimental (was - Re: Review… Matthew Kerwin
- Re: [apps-discuss] Experimental (was - Re: Review… Dave Crocker
- Re: [apps-discuss] Experimental (was - Re: Review… Mark Nottingham
- Re: [apps-discuss] Experimental (was - Re: Review… Graham Klyne
- Re: [apps-discuss] Experimental (was - Re: Review… Graham Klyne
- Re: [apps-discuss] Experimental (was - Re: Review… Dave Crocker
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Matthew Kerwin
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Matthew Kerwin
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Julian Reschke
- [apps-discuss] New information relating to draft-… Graham Klyne
- Re: [apps-discuss] New information relating to dr… Matthew Kerwin
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Martin J. Dürst
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Murray S. Kucherawy
- Re: [apps-discuss] New information relating to dr… Graham Klyne
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Matthew Kerwin
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Julian Reschke
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Matthew Kerwin
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… John C Klensin
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Martin J. Dürst
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… John C Klensin
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Ned Freed
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… John C Klensin
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Matthew Kerwin
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Matthew Kerwin
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Dave Crocker
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Matthew Kerwin
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Sean Leonard
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Matthew Kerwin
- Re: [apps-discuss] Review of draft-ietf-appsawg-f… Sean Leonard