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My fault, I didn't read your message carefully enough.  

No, sorry, this won't be supported (not initially at least).  I can see where it would be useful, and I see where it was suggested, back in 2011.  But over the course of the several years spent developing the draft spec there were many suggestions, far too many to support then all, and this one didn't make the cut, probably because nobody picked up on the suggestion.  

Once the standard is approved, there will probably be a maintenance agency and a procedure developed for extensions.

Ray

> -----Original Message-----
> From: Discussion of the Developing Date/Time Standards
> [mailto:[log in to unmask]] On Behalf Of Sylvester Keil
> Sent: Thursday, January 04, 2018 2:48 PM
> To: [log in to unmask]
> Subject: Re: [DATETIME] Seasons in intervals (ISO 8601)
> 
> I'm sorry, I should have phrased my question more clearly; I'm aware of
> 4.7 'Divisions of a Year', but is this feature supported within intervals, defined
> in section 4.4?
> 
> For example, will something like the following be supported:
> 
> 2017-21/2017-23 (season/season interval)
> 2017-21/2017-12 (mixed season/year-month interval)
> 2017-21/* or /2017-21 (open or unknown season interval)
> 
> Using seasons in intervals seems rather useful for referencing publications and
> I'm considering implementing support for it, but unless I'm missing something,
> I'm worried that this does not conform to the specification.
> 
> Many thanks,
> Sylvester
> 
> 
> 
> 
> 
> 
> 
> 
> On Wed, 2018-01-03 at 21:21 +0000, Denenberg, Ray wrote:
> > Yes, seasons will be supported but the heading is generalized to
> > "Divisions of a Year".  Following is the (draft) text:
> >
> > 4.7 Divisions of a year
> > 4.7.1 General
> > For a year-and-month expression (e.g. 1984-04) the month component can
> > take on values of 21 or above (in place of a month value, 01 through
> > 12).  These values signify a division of a year (e.g. “the season
> > Spring”).
> >
> > 4.7.2 Level 1
> >
> > The values 21, 22, 23, 24 can be used to signify ' Spring', 'Summer',
> > 'Autumn', 'Winter', respectively.
> >
> > Format: YYYY-SS
> >
> > Example:
> >
> > •             2001-21
> >   Spring, 2001
> >
> >
> > Ray
> >
> > > -----Original Message-----
> > > From: Discussion of the Developing Date/Time Standards
> > > [mailto:[log in to unmask]] On Behalf Of Sylvester Keil
> > > Sent: Wednesday, January 03, 2018 2:53 PM
> > > To: [log in to unmask]
> > > Subject: [DATETIME] Seasons in intervals (ISO 8601)
> > >
> > > My apologies if this has been discussed already in the past, but
> > will seasons in
> > > intervals still be supported by ISO 8601?
> > >
> > > I have found a related discussion about seasons in intervals for
> > the original
> > > EDTF spec in the archive [1], but the draft ISO 8601-2 document
> > does not make
> > > any mention of this to the best of my knowledge.
> > > Specifically, section 4.4 and Annex A  seem to imply that seasons
> > in intervals
> > > are not allowed — is that correct?
> > >
> > > For the related issue in edtf.js see [2].
> > >
> > > Many thanks,
> > > Sylvester
> > >
> > > [1] https://listserv.loc.gov/cgi-bin/wa?A2=DATETIME;cdcd7c8d.1108
> > > [2] https://github.com/inukshuk/edtf.js/issues/12