On Fri, 12 May 2023 16:41:20 GMT, Steven Loomis <s...@openjdk.org> wrote:

>>> I'm just wondering where a developer might go to get a definitive list, 
>>> i.e. aside from this API note, how would they know that "-trad" or 
>>> "-traditional" can be used to configure the ordering. Locale.forLanguageTag 
>>> supports more than BCP 47 language tag strings so is this considered a 
>>> private use language tag.
>> 
>> I think those should go into Oracle JDK's `Supported Locales` document. 
>> Created a task to include them (https://bugs.openjdk.org/browse/JDK-8308018)
>
>> > I'm just wondering where a developer might go to get a definitive list, 
>> > i.e. aside from this API note, how would they know that "-trad" or 
>> > "-traditional" can be used to configure the ordering. 
>> > Locale.forLanguageTag supports more than BCP 47 language tag strings so is 
>> > this considered a private use language tag.
>> 
>> I think those should go into Oracle JDK's `Supported Locales` document. 
>> Created a task to include them (https://bugs.openjdk.org/browse/JDK-8308018)
> 
> `-u-co` is defined 
> [here](https://www.unicode.org/reports/tr35/#UnicodeCollationIdentifier) 
> (UTS#35) and the keys are in the datafile [here (link to `main` 
> branch!)](https://github.com/unicode-org/cldr/blob/main/common/bcp47/collation.xml)
>  - note the `since=` attribute, these are very stable.
> 
> @AlanBateman 
>> Locale.forLanguageTag supports more than BCP 47 language tag strings
> 
> It should still be all valid BCP47 including extensions and private use (such 
> as x-lvalue). 
> 
>> so is this considered a private use language tag
> 
> Not private use at all. The `-u-` subtag is registered, and the links above 
> are from the registrar, see
> - https://www.rfc-editor.org/info/bcp47
> - https://www.rfc-editor.org/rfc/rfc6067

> Thanks @srl295
> I am just curious how CLDR handles the default switch of Swedish collation. 
> Now the `traditional` collation used to be `standard`, and `standard` used to 
> be `reformed`. How do apps specify their desired collation in Swedish, 
> regardless of CLDR versions?

I don't know off the top of my head but digging around I found 
https://unicode-org.atlassian.net/browse/CLDR-7088 and cross linked some 
tickets. Can you ask around on those?

-------------

PR Comment: https://git.openjdk.org/jdk/pull/13917#issuecomment-1546050297

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