Good idea.. perhaps not just season but also month, bi-yearly, quarterly (as
distinguished from seasons):
  n-annually (n=2 for biannual, N=3 for triannual, N=4 for quarterly,...
n=1/2 for bienalle, eg. every two years, n=1/3 for ...) might be of
interest.. Here the implied precision is the modifier.. e.g. a bi-annual
open interval has "points" whose precision are half-years, a bienalle open
interval has "points" with precision of 2 years, etc...

On Sat, 20 Aug 2011 15:32:21 +0200, [UTF-8?]SaaÅ¡ha Metsärantala wrote
> Hello!
>
> Here, I am suggeting a small (but probably useful) improvement to the
> EDTF specification. What do you think about adding the following new
> feature at #103 (or maybe #205)
>
> 2008-21/open
>
> which could for example be really useful to store the publication date for
> a journal first issued in "spring 2008" and still publish four times a
year
> (spring, summer, fall and winter - in any order)? The BNF could be really
> easily modified for that, just replacing
>
> > L1Start = (date UASymbol?) | "unknown"
>
> with
>
> L1Start = ( ( date | season ) UASymbol?) | "unknown"
>
> Regards!
>
> [UTF-8?]Saašha,


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Edward C. Zimmermann, NONMONOTONIC LAB
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