From: Mike (mike-list@pobox.com)
Date: Mon May 07 2007 - 16:45:59 CDT
Philippe Verdy wrote:
> Richard Wordingham wrote:
>> The present standard for International Domain Name Processing (nameprep -
>> RFC 3491 and stringprep - RFC 3454) currently operates with four steps:
>> mapping, normalisation (NFKC), prohibition and bidi checking. Mapping
>> replaces single characters by sequences, which may be empty. It is
>> composed
>> of two elements - deletion of default ignorables, and full case-folding,
>> complicated because it is done before compatibility decomposition. (I may
>> have missed some minor wrinkles in mapping.)
>
> Isn't the Unicode normalization the first step to perform before performing
> mappings and deletion?
No, there are two possible mappings: one for when you plan to normalize
and the other when you are not normalizing. NFKC is the second step, if
the stringprep profile requests it, as does nameprep.
Mike
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