[threeten-dev] Islamic calendar variants need disambiguation

[Stephen Colebourne]

On 10 January 2013 21:04,  <yoshito_umaoka at us.ibm.com> wrote:
> We had a discussion about this in the CLDR TC meeting.
> Our tentative consensus is supporting calendar variations with a new
> extension.
>
> Although CLDR defines two types "islamic" and "islamicc", CLDR only has
> one set of formatting data. From formatting aspect, the difference in date
> calculation between them is not important. Our current plan is:
>
> 1. Add a new extension "cv" (calendar algorithm variant - tentative).
> 2. Investigate necessary types from experts, based on some references
> including your ticket above.
> 3. Deprecate "islamicc", and map to ca-islamic-cv-??? (??? will be
> determined later).
>
> Note that the type value is limited to 8 characters because of BCP 47
> definition. We also considered multi-segment calendar type like
> islamic-umalqura as you suggested in the ticket, but it will require a
> bunch of duplicated references in CLDR data formatting data. For this
> reason, we are in favor of separating minor algorithm differences in a
> separate extension.

FWIW, I like the "cv" variant concept as it makes logical sense. It
will be harder to integrate into JSR-310 (where our methods take a
single String). The lookup from a Locale object will of course pose no
problem to adapt.

Stephen