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RE: New Thread - FVS Assignment MisMatch

From: Greg Eck <greck@postone.net>
Date: Thu, 6 Aug 2015 17:16:51 +0000
To: "jrmt@almas.co.jp" <jrmt@almas.co.jp>, 'Richard Wordingham' <richard.wordingham@ntlworld.com>
CC: "public-i18n-mongolian@w3.org" <public-i18n-mongolian@w3.org>
Message-ID: <BN3PR10MB032166FDD815B2B5E6870161AF740@BN3PR10MB0321.namprd10.prod.outlook.com>
Sorry, I did not mean to say that the font designer can do anything he wants with the unspecified Character+FVSx sequence.
He doesn't do anything with it and and it will not change from the Character+NoFVS - which is essentially the default positional form.
Greg


-----Original Message-----
From: jrmt@almas.co.jp [mailto:jrmt@almas.co.jp] 
Sent: Thursday, August 6, 2015 5:52 PM
To: 'Richard Wordingham' <richard.wordingham@ntlworld.com>; Greg Eck <greck@postone.net>
Cc: public-i18n-mongolian@w3.org
Subject: RE: New Thread - FVS Assignment MisMatch

Hi Greg,

>> If we take one example from the font comparator site 
>> (http://r12a.github.io/scripts/mongolian/variants ) and look at
>> U+1820. We see that Isolate+FVS1 is specified. Isolate+FVS2 AND
>> Isolate+FVS3 are not specified as they are "don't care conditions".
>> These two sequences are left to the judgment of the font designer to 
>> handle.

>No.

><U+1820, FVS3> must be treated the same as U+1820, for the variation
sequence is not defined.  
> Once <U+1820, FVS2> ceases to be specified for any position, then the 
> same
will apply to <U+1820, FVS2>.

>It is not clear what should happen if only some positional variants are
defined for a variation sequence.

I agree Richard's point of view on this.
"don't care conditions" should means same with original. 
If we left the Isolate+FVS2 AND, Isolate+FVS3 of U1820 to font designer to decide the usage, There will be other new unstable elements appears in the future.

Regards

Jirimutu
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Jirimuto


-----Original Message-----
From: Richard Wordingham [mailto:richard.wordingham@ntlworld.com]
Sent: Thursday, August 6, 2015 11:23 AM
To: Greg Eck
Cc: jrmt@almas.co.jp; public-i18n-mongolian@w3.org
Subject: Re: New Thread - FVS Assignment MisMatch

On Thu, 6 Aug 2015 01:56:08 +0000
Greg Eck <greck@postone.net> wrote:

> If we take one example from the font comparator site 
> (http://r12a.github.io/scripts/mongolian/variants ) and look at
> U+1820. We see that Isolate+FVS1 is specified. Isolate+FVS2 AND
> Isolate+FVS3 are not specified as they are "don't care conditions".
> These two sequences are left to the judgment of the font designer to 
> handle.

No.

<U+1820, FVS3> must be treated the same as U+1820, for the variation sequence is not defined.  Once <U+1820, FVS2> ceases to be specified for any position, then the same will apply to <U+1820, FVS2>.

It is not clear what should happen if only some positional variants are defined for a variation sequence.

Richard.
Received on Thursday, 6 August 2015 17:17:25 UTC

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