Re: [Ltru] font features in CSS
"Martin J. Dürst" <duerst@it.aoyama.ac.jp> Fri, 30 October 2009 09:29 UTC
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Date: Fri, 30 Oct 2009 18:29:07 +0900
From: "\"Martin J. Dürst\"" <duerst@it.aoyama.ac.jp>
Organization: Aoyama Gakuin University
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To: "Adam Twardoch (List)" <list.adam@twardoch.com>
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Cc: LTRU Working Group <ltru@ietf.org>, www-font <www-font@w3.org>, Håkon Wium Lie <howcome@opera.com>, www-style <www-style@w3.org>, Jonathan Kew <jonathan@jfkew.plus.com>, Stephen Zilles <szilles@adobe.com>
Subject: Re: [Ltru] font features in CSS
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Hello Adam, [cc to IETF LTRU WG] On 2009/10/30 16:12, Adam Twardoch (List) wrote: > III. LANGUAGE CLASSIFICATION > > All OpenType Layout features are assigned in a context of specific > script and language system. While the assignment of script is easy (the > engine can determine from the Unicode string which script a certain > character belongs to, and from there it can pick the appropriate > OpenType script branch to apply the features for), the language system > is trickier. > > As you can see from > http://www.microsoft.com/typography/otspec/languagetags.htm > OpenType uses a list of language systems that do not have a 1:1 > correspondence with any of the ISO 639 standards. In OpenType 1.6 (at > the link above), an informational mapping of OpenType language system > tags and "best matches" in the ISO 639 standards has been provided. It > is quite obvious that a web browser that applies OpenType Layout > features should observe the HTML "lang" attribute and, if present, apply > the appropriate features from the particular language system branch in a > font (and only if absent, apply the features from the Default language > system within a script branch). But it might be worth considering to add > a low-level CSS access mechanism to allow users to choose a specific > OpenType language system, because some ISO 639 codes can map to several > OpenType language systems, e.g. > > (OT) (ISO) > Chinese Hong Kong ZHH zho > Chinese Phonetic ZHP zho > Chinese Simplified ZHS zho > Chinese Traditional ZHT zho HTML lang and XML xml:lang use BCP 47 (http://tools.ietf.org/html/bcp47, formerly RFC 1766/3066/4646) tags, not ISO 639 directly. BCP 47 uses two-letter codes (i.e. 'zh') and not three-letter codes (i.e. 'zho') when two-letter codes are available. Also, BCP 47 has facilities for indicating Region (country,...) with two-letter codes and for indicating script with four-letter codes. So the above list should be changed to: (OT) (BCP 47) Chinese Hong Kong ZHH zh-HK Chinese Phonetic ZHP ** Chinese Simplified ZHS zh-Hans Chinese Traditional ZHT zh-Hant ** not sure what's meant by Chinese Phonetic, may be zh-Latn (Latin transcription) or zh-Bopo (Bopomofo)? Regards, Martin. -- #-# Martin J. Dürst, Professor, Aoyama Gakuin University #-# http://www.sw.it.aoyama.ac.jp mailto:duerst@it.aoyama.ac.jp
- Re: [Ltru] font features in CSS Doug Ewell
- Re: [Ltru] font features in CSS Martin J. Dürst
- Re: [Ltru] font features in CSS Mark Davis ☕
- Re: [Ltru] font features in CSS Andrew Cunningham
- Re: [Ltru] font features in CSS Peter Constable
- Re: [Ltru] font features in CSS Peter Constable
- Re: [Ltru] font features in CSS John Cowan
- Re: [Ltru] font features in CSS Martin J. Dürst
- Re: [Ltru] font features in CSS Andrew Cunningham