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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?]SaaÅ¡ha, -- Edward C. Zimmermann, NONMONOTONIC LAB http://www.nonmonotonic.net Umsatz-St-ID: DE130492967