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RE: NNBSP Impact

From: <jrmt@almas.co.jp>
Date: Sun, 2 Aug 2015 17:58:25 +0900
To: "'Richard Wordingham'" <richard.wordingham@ntlworld.com>, <public-i18n-mongolian@w3.org>
Message-ID: <000a01d0cd01$646fbc10$2d4f3430$@almas.co.jp>
Hi Richard,

> When you say 'on top', do you 'to the left' in vertical writing, or do they interrupt the sequence of letters with stems?  
> If they interrupt the sequence of letters with stems, then they are letters, and the Unicode properties are correct.
In the Mongolian Vertical writing mode, the "on top" in horizontal writing, will become "on the right side" actually.
But what I mean here "on top of corresponding character" in horizontal writing, still remain "in the top" in the vertical writing mode.
Because the Chinese and Tibetan character will not rotate in vertical writing system actually. 

As my understanding, In vertical writing, the 'on top' means write the sign above the character.
In horizontal writing system, I am not sure where to write the sign, left side or on the top.
But I can see in the Sanskrit word they are written on the top or on the bottom of the corresponding character in horizontal writing. 
According to http://www.unicode.org/L2/L2009/09032-n3568.pdf which is the URL from Andrew West's discussion,
there are some word with the U1883, U1884 on the top of the Mongolian character ᠪᠠ and ᠫᠠ.
When I open the U1800.pdf updated version recently, the Mongolian Characters all written in horizontal writing, 
And I found the U1883 and U1884 is also rotated to fit to write in the left side of the Mongolian character. 
This is mean that these character will be written on the left side of the corresponding character in horizontal writing mode.

Thanks and Best Regards,

Jirimutu
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Jirimutu

-----Original Message-----
From: Richard Wordingham [mailto:richard.wordingham@ntlworld.com] 
Sent: Sunday, August 2, 2015 5:08 PM
To: public-i18n-mongolian@w3.org
Subject: Re: NNBSP Impact

On Sun, 2 Aug 2015 15:48:34 +0900
<jrmt@almas.co.jp> wrote:

> For this reason, these character is not the punctuation group. It is 
> the part Mongolian word. I am not sure if it is proper or not to 
> classify them to ALetter or to Others. Maybe it should be classified 
> to Extend or Format ? just my personal consideration now.

When you say 'on top', do you 'to the left' in vertical writing, or do they interrupt the sequence of letters with stems?  If they interrupt the sequence of letters with stems, then they are letters, and the Unicode properties are correct.

If they are written to the side when writing vertically, then:

1) The representative glyphs in the Unicode Standard need to be changed (to the style seen for U+18A9, with a dotted circle)
2) Their general category (gc) needs to be changed from Lo to Mn
3) As a result of this change, they should be automatically reclassified as Word_Break = Extend and Line_Break=CM.  There are other changes that should also be made, but these will probably also be made automatically or semi-automatically.

None of this affects word breaking or lay-out.  It ought not to affect OpenType fonts with complete GDEF tables if they are already rendering correctly.

Richard.
Received on Sunday, 2 August 2015 08:58:51 UTC

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