On 2010-12-21 <11:11:33>, Arthur Reutenauer wrote:
> > BTW: What is the difference what the COUNTRY code and the LANGUAGE code affects?
> 
>   In your case, you should use a language code since you want to set a
> language.  ConTeXt has used different sets of codes in the past, but we
> now try to follow IETF recommendation "Tag for Identifying Languages"
> (http://tools.ietf.org/html/bcp47), because it's the only one that can
> be precise enough for our needs (at least among the tagging systems I
> know of).  For example, you can distinguish between British English and
> American English by appending a country code to the language code (hence
> "en-gb" and "en-us", respectively).  Using a country code to identify a
> language is generally a bad idea and should be discouraged, since that's
> not what they're meant for, and it can lead to confusion: for example,
> you could use the code "uk" to identify English as spoken in the United
> Kingdom, but that's actually the language code for Ukrainian, which has
> been an actual problem for ConTeXt in the post (in addition to that,
> "uk" is not even the proper language code for the United Kingdom: it's
> "gb", as written above; the reason why "uk" is used as a DNS top-level
> domain is not clear and has lead, alas, to even more confusion).

But context uses some non-standard codes also: “deo” instead of
“de-1901” for sane German orthography, and “agr” for ancient
Attic instead of “grc” or “el-polyton”. (Testfile appended.)

Philipp

PS: nice tools
    http://people.w3.org/rishida/utils/subtags/
    http://unicode.org/cldr/utility/languageid.jsp



>   The authorities that decide upon language and country codes are
> different committees of the ISO; the ISO standard for language codes is
> ISO 639 (with different parts), and the one for country codes is ISO 3166
> (again, with different parts; the two-letter codes of ISO 3166-1 are
> generally rather well-known because they're the ones being used for DNS
> top-level domains -- with some exceptions, see above).
> 
> 	Arthur
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