[tz] State of the tzdb

Guy Harris guy at alum.mit.edu
Tue Sep 3 19:30:29 UTC 2013

On Sep 3, 2013, at 4:43 AM, Lester Caine <lester at lsces.co.uk> wrote:

> Stephen Colebourne wrote:
>> We're a lot further forward now to regaining stability, but there are
>> a few points still outstanding.
>> 1) Should there be one zone ID in the main files (not "backward") for
>> each inhabited ISO-3166 code?
>> I've argued for this as a reinstatement of a rule of 16 years standing
>> which is no more than common sense.
>> Paul has argued against.
> A debate on openstreetmap at the moment relates to the status of historic information in that database. Many people feel that if it does not currently exist on the ground, then it should be removed. It is a little of an academic discussion since the data will remain in the change logs anyway, but it's access to that data which is at question. The current proposal is that some data is archived to an openhistorymap which will allow the use of a 'date' to define what data is displayed, but in many cases the bulk of the main database needs to be combined with the small amount of history to create the final dataset anyway, so openhistorymap has to have a complete copy of the main map! You can't define a reason for NOT including something in the historic map.
> Not to dissimilar to what we are talking about here?

You're talking about historical data, so you're presumably referring to this point in Stephen's message:

> 5) Pre-1970 data
> Some of this seems uncontroversial at this point (don't remove data,
> don't create new IDs just for pre-1970). Some of it is still under
> discussion. Only enhancement of existing IDs is necessary to the
> applications I work with.
> As noted in the other thread, removing IDs that only differ in LMT is
> harder than initially thought, as the start of fixed offsets and the
> name of fixed offsets are pieces of data covered under the no deletion
> rule. As such, it is unlikely that there are many possibilities for
> merging zones.

not to the quoted point, which was about ISO 3166 country codes.  If, for example, you're talking about rules within the UK, those all correspond to a single ISO 3166 country code, so his point about ISO 3166 country codes doesn't apply.

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