Allow specifying OpenType script tag via BCP 47 language extension

[behdad]

From mailing list discussion:

Yes, separate x-prefixes for script and land would be good! (That'd allow for 3-letter script tags).

Sent from my mobile phone.

On 07.05.2015, at 04:28, Martin Hosken mhosken@gmail.com wrote:

Dear Behdad,

I can extend the BCP 47 extension to also choose the script system if it's
available. Eg, a language setting of "x-hbotdeva" will choose "deva" whereas
"x-hbotdev2" will choose "dev2". This works for script tags that have four
letters (ie, not 'lao ', 'yi ', 'nko ', and 'vai ').

We would only recognize the three-letter ones as language system tag.

This will be useful for choosing 'math' script as well.

+1

Or you could use x-hbscdev2 (as in script) to separate the namespaces.