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Re: [apps-discuss] Review of draft-ietf-appsawg-file-scheme

Martin J. Dürst <duerst@it.aoyama.ac.jp> Tue, 10 May 2016 10:19 UTC

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To: John C Klensin <john-ietf@jck.com>, Julian Reschke <julian.reschke@gmx.de>, Matthew Kerwin <matthew@kerwin.net.au>
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From: "Martin J. Dürst" <duerst@it.aoyama.ac.jp>
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Date: Tue, 10 May 2016 19:19:43 +0900
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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 2016/05/09 01:26, John C Klensin wrote:
>
>
> --On Saturday, May 07, 2016 11:31 +0200 Julian Reschke
> <julian.reschke@gmx.de> wrote:
>
>>> Care must be taken to avoid issues resulting from aliasing
>>> from mismatched encodings or Unicode equivalences.
>>> ""
>>
>> That can't hurt.
>>
>> I wonder whether we can say something useful about how to map
>> Unicode code points into the file URI (that is, before
>> percent-encoding the UTF-8 octets). Is it a good idea to apply
>> unicode normalization at this step? (I don't know but maybe
>> others do?)

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.

But milage(s) may vary.

Regards,   Martin.


> The developing conventional wisdom outside the IETF is to not
> bother (and run the risk of normalization losing information or
> causing other problems) but to save normalization for the actual
> point at which the URI or other identifier is interpreted.  In
> the particular case of "file" that might be particularly
> important since some systems prefer different normalization
> forms and have different restrictions.
>
> Note that is not necessarily advice, just a report.
>
>    john
>
>
>
>
>
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