[tz] Proposed patch - Theory notes for backward file
scolebourne at joda.org
Thu Sep 5 14:27:49 UTC 2013
On 5 September 2013 15:15, Zefram <zefram at fysh.org> wrote:
> Stephen Colebourne wrote:
>>My primary concern is ensuring that the backward file is removable -
>>ie. no other files contain the "inactive" backward Link entries.
> These statements don't match. For the "backward" file to be removable
> what you need is that the "backward" file does not contain any "active"
> entries. No other files containing "inactive" entries is what's needed
> to have an easy way of feeding only "active" entries to zic. Maybe you
> want both of these things?
> I'd also like to see the active and inactive links distinguished somehow,
> for internal clarity. I'm not so concerned about the mechanism by which
> they're distinguished, but segregating them fully by file certainly has
> its attractions. FWIW, my winnowing branch effectively distinguishes
> between active and inactive links for geographical zones by whether it
> includes population data. (It doesn't thus distinguish active/inactive
> non-geographical zones.)
The backward file contains this line for example:
Link Asia/Kolkata Asia/Calcutta
I'm simply arguing that the Asia/Calcutta ID should only appear in
backward, with Asia/Kolkata being used everywhere else.
That way, excluding the backward file has no effect other than
removing "no longer desirable" IDs.
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