On Sun, 7 Jul 2002, Keith Packard wrote:
> 
> The question is whether we should mark certified GB18030 fonts as suitable 
> for zh-TW as well as zh-CN.  I have the GB18030 varient of SimSun here in 
> TrueType and it does not have the traditional Chinese codePageRange bit 
> set, but does cover the codepoints found in Big5.
> 
> If that's just varience in typographic style, we should make sure it 
> doesn't influence language support.  Should a reader in zh-CN locale
> use a Sung typeface for traditional Chinese?  Or should we direct them to 
> a Ming typeface instead?

It would be a good idea to let user to determine (or overwrite the
default) on what font they want to use for each language (ie. in
fonts.conf).

> 
> Would it be appropriate to mark a GB18030 font as supporting 'zh' then?  
> Right now, I'm using:

I think the ideal way is to add certified GB18030 for zh, but with lower 
priority. But of course users may encounter the mixed glyphs from 
different character if they have a incomplete Big5 or HKSCS font.

ie. Higher its priority if it have correct codePageRange bit, include 
the font and lower its priority if it covers the codepoints but does not 
not match that codePageRange bit.

> 
>       gb2312          ->      zh-cn
>       Big5            ->      zh-tw
>       JIS X 0208      ->      ja
>       KSC 5601        ->      ko
> 
> I could easily add:
> 
>       GB18030         ->      zh
> 
> As per your earlier suggestion, I will add:
> 
>       gb2312          ->      zh-sg
>       Big5            ->      zh-mo
> 
> I don't have a complete codepoint set for HKSCS; can someone point me at 
> one?

http://www.info.gov.hk/digital21/eng/hkscs/download.html

Other useful documents:
http://www.info.gov.hk/digital21/eng/hkscs/document.html

> 
> With these additions, a GB18030 font would advertise support for:
> 
>       zh, zh-cn, zh-tw, zh-sg, zh-mo
> 
> while older GB2312 fonts would be limited to
> 
>       zh-cn, zh-sg
> 
> Keith Packard        XFree86 Core Team        HP Cambridge Research Lab

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