W3C home > Mailing lists > Public > public-powderwg@w3.org > November 2007

Re: [comment] URI/IRI canonicalization in powder-grouping

From: Phil Archer <parcher@icra.org>
Date: Mon, 19 Nov 2007 15:48:34 +0000
Message-ID: <4741B052.8040201@icra.org>
To: Thomas Roessler <tlr@w3.org>, public-powderwg@w3.org, pgrosso@ptc.com, ht@w3.org, duerst@it.aoyama.ac.jp

Thomas and all,

Just a quick note to say thank you for your comments on this issue. We 
are currently going through a significant revision of just about 
everything but will come back to the URI canonicalisation issue in due 
course and will take your comments on board then.

Thanks again


Thomas Roessler wrote:
> On 2007-11-14 12:43:24 +0100, Thomas Roessler wrote:
>> - It is not clear to me whether you want to consider a
>>   human-readable representation in case of internationalized domain
>>   names occuring in the authority part of the URI, or whether you
>>   consider the ASCII representation in that case.
>>   This specifically affects the case-insensitive part of the host
>>   name comparison (only US-ASCII domain names are case-insensitive).
> On this topic, also note RFC 3490, section 2.
>    In IDNA, equivalence of labels is defined in terms of the ToASCII
>    operation, which constructs an ASCII form for a given label,
>    whether or not the label was already an ASCII label.  Labels are
>    defined to be equivalent if and only if their ASCII forms
>    produced by ToASCII match using a case-insensitive ASCII
>    comparison. ASCII labels already have a notion of equivalence:
>    upper case and lower case are considered equivalent.  The IDNA
>    notion of equivalence is an extension of that older notion.
>    Equivalent labels in IDNA are treated as alternate forms of the
>    same label, just as "foo" and "Foo" are treated as alternate
>    forms of the same label.
> Regards,

Phil Archer
Chief Technical Officer,
Family Online Safety Institute
w. http://www.fosi.org/people/philarcher/

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Received on Monday, 19 November 2007 15:48:54 UTC

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