[threeten-dev] CLDR calendar variants

[yoshito_umaoka at us.ibm.com]

Dan raised some concerns about cv-mshijri.
He and I had some discussions offline and I also forwarded his concerns to 
other CLDR TC folks.

I was initially trying to add the calendar variant subtags into CLDR 23 
relaese and I actually added them into the CLDR source repository.
However, we don't want to change them after release and it seems his 
concerns are not resolved yet, we decided to defer the addition after CLDR 
23 release.

The previous proposal was -

<key name="cv" description="Calendar algorithm variant">
    <type name="caltab" description="Islamic - Calendrica arithmetic"/>
    <type name="mshijri" description="Islamic - Microsoft Hijri 
calendar"/>
    <type name="rgsa" description="Islamic - Saudi Arabia visual 
sighting"/>
    <type name="umalqura" description="Islamic - Umm Al-Qura calendar of 
Saudi Arabia"/>
</key> 

The question is - whether we need to replace "mshijri" with more generic 
name/description. If we go for more generic naming/description for this 
one, then "caltab" may be also changed (it's technically just using Friday 
epoch, instead of Thursday epoch used by MS implementation).

For all others - the key "cv" ad "rgsa"/"umalqura" should be used without 
any changes after CLDR 23.
CLDR 24 will be planned in September, and we may have CLDR 23.1 
(maintenance update to 23) before that.

-Yoshito