Re: [precis] WGLC: draft-ietf-precis-framework-09.txt

On 2013/10/09 18:02, "Martin J. Dürst" wrote:
> On 2013/10/09 5:55, Peter Saint-Andre wrote:
>> On 9/11/13 8:06 PM, Joseph Yee wrote:
>
>>> Reviewed the draft, think the approach is good. Just one minor comment.
>>>
>>> Same as Florian, had the 'hmm' reaction when reading about
>>> directionality and application behaviour at Section 3.1. It seems that
>>> the only application behaviour is permitted pattern. It doesn't deal
>>> with visual appearance I believed. Maybe replace 'application
>>> behaviour' with 'permitted patther of the string' (or 'allowed
>>> combination of the string')?
>>
>> Hmm, I see why you and Florian don't like that text. :-)
>>
>> How about this?
>>
>> OLD
>> Directionality: defines application behavior in the presence of code
>> points that have directionality, in particular right-to-left code
>> points as defined in the Unicode database (see [UAX9]).
>>
>> NEW
>> Directionality: defines which strings are to be considered
>> left-to-right (LTR) and right-to-left (RTL), and the allowable
>> sequences of characters in LTR and RTL strings.
>
> That may be an improvement, but it's missing the fact that LTR and RTL
> strings are the only two alternatives allowed.
>
> Also, it would be good to somewhere say that there is currently no
> widely accepted and implemented solution for the display of constructs
> with mixed pieces (e.g. domain names with LTR and RTL components
> (labels), because the problem is inherently extremely hard.

In addition, in the introduction, there is a paragraph:

    5.  Leave various mapping operations (e.g., case preservation or
        lowercasing, Unicode normalization, mapping of certain characters
        to other characters or to nothing, handling of full-width and
        half-width characters, handling of right-to-left characters) as
        the responsibility of application protocols, as was done for
        IDNA2008 through an IDNA-specific mapping document [RFC5895].

where "handling of right-to-left characters" is described as a mapping 
operation. That doesn't make sense to me, I think it should be moved out 
to a separate point.

Regards,   Martin.

> Regards, Martin.
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