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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Probably what really should be used are not BCP 47 _<i>language tags</i>_ but rather BCP 47 _<i>extended language ranges</i>_. For instance, “*-Latn” is an
extended language range that can be used to indicate applicability to content in any language written in Latin script.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">In Windows 7, I implemented a feature that’s reflected in the Windows 7 Fonts control panel that used metadata tags to capture a description of what languages
a font was designed for – i.e., would be a value add for users of that language. In that metadata, we used tags following BCP 47 syntax but with a small variation: the script subtag, and only the script subtag, was mandatory. That achieved the desired result;
BCP 47 extended language ranges provide for the same capabilities but using something defined in an open industry spec.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Btw, I think I managed to convince Elika Etemad last year that the CSS spec for lang pseudo-class selectors should support extended language ranges. I haven’t
followed up to see if that’s getting clarified in a draft revision to CSS selectors.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Peter<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> mpeg-OTspec@yahoogroups.com [mailto:mpeg-OTspec@yahoogroups.com]
<b>On Behalf Of </b>John Hudson<br>
<b>Sent:</b> Tuesday, January 08, 2013 2:47 PM<br>
<b>To:</b> opentype-migration-list@indx.co.uk; mpeg-OTspec@yahoogroups.com<br>
<b>Subject:</b> Re: [mpeg-OTspec] Re: [OpenType] MS Proposal for a new Name Table ID<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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<p>I'm beginning to think that two levels of information might beneficially <br>
be indicated using the kind of tagging in this proposal. I can think of <br>
plenty of fonts in which the information of interest is script rather <br>
than language, e.g. an Indic font that contains a Latin 8-bit subset for <br>
purely technical reasons and that is not intended to be used to set <br>
Latin-script text. In that case, one would want to be able to indicate <br>
that e.g. the Devanagari script is the intended use, not particular <br>
languages using that script. The latter might be secondary information <br>
if, e.g. a font is particularly intended for Marathi and not suitable <br>
for Hindi.<br>
<br>
As I understand it, the BCP 47 language tags include provision for <br>
indicating script, but only as a secondary indicator applied to a <br>
language tag, e.g.<br>
<br>
zh-Hant (Chinese written in Traditional Chinese script)<br>
zh-Hans (Chinese written in Simplified Chinese script)<br>
<br>
And for font tagging purposes this is backwards: the first -- and often <br>
only -- indicator of intention needed is a script tag. This suggests to <br>
me a hierarchy of script and language.<br>
<br>
Now, this might suggest something like Adam's proposed use of existing <br>
OTL tags to indicate intention, only in this case the script and <br>
language system tags. I don't think this works though, because I <br>
regularly include Latin kerning and other features appropriate to the <br>
character set in fonts that happen to include a Latin subset, even <br>
though the font is not intended for setting Latin-script text, and hence <br>
have a OTL feature tree in the font. After all, even if a font is <br>
not intended for setting text in a Latin-script language, the occasional <br>
untransliterated English word may occur within e.g. Hindi text, and <br>
should be properly displayed with appropriate kerning. Also, the OTL <br>
language system tags indicate something other than language (what I <br>
would call -- to use terminology in a way similar to Martin -- <br>
particular writing systems whose characteristic differ from the defaults <br>
of an individual font's behaviour). And, of course, the OTL language <br>
system tags, other than , indicate exceptions rather than intentions.<br>
<br>
So I think a tagging system to indicate intentions is a good idea, but <br>
think it needs to provide for both script and language. It should <br>
definitely be possible to tag a script or scripts as intended use, <br>
without needing to tag any languages. I'm leaning towards requesting <br>
some kind of hierarchical model, because I can imagine wanting to <br>
indicate something like this:<br>
<br>
Latin<br>
Cyrillic<br>
- Bosnian<br>
<br>
Of course, Bosnian can be written in the Latin script too, but a font <br>
wouldn't necessarily need to indicate specific support for this, since <br>
the required characters and glyphs wouldn't differ from norms for any <br>
other languages, while the Cyrillic requirements might.<br>
<br>
JH<br>
<br>
-- <br>
<br>
Tiro Typeworks <a href="http://www.tiro.com">www.tiro.com</a><br>
Gulf Islands, BC <a href="mailto:tiro%40tiro.com">tiro@tiro.com</a><br>
<br>
The criminologist's definition of 'public order<br>
crimes' comes perilously close to the historian's<br>
description of 'working-class leisure-time activity.'<br>
- Sidney Harring, _Policing a Class Society_<o:p></o:p></p>
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