[tz] Zone name policy

[Garrett Wollman]

<<On Thu, 1 Dec 2016 13:46:39 -0800, Paul Eggert <eggert at cs.ucla.edu> said:

> On 12/01/2016 01:30 PM, Guy Harris wrote:
>> It would have been nice if there had been some form of ID that we could have used for tzdb zones that*didn't*  involve city names

> How about SHA-256 checksums? Instead of "Europe/Kiev" the zone name 
> would be 
> "099d2adb7f9a187c25224cd49364de6d510d6e89924584c0b97d88d3f801e551", 
> which would make users less likely to raise political objections. 

A stable identifier is what's needed.  What would that be the SHA-256
of?  If it's a hash of the data, then you no longer have a stable
identifier.

-GAWollman