daniel added a comment.

I agree that we should gather more data before continuing the discussion about 
the interpretation of dates stored in wikidata.

In https://phabricator.wikimedia.org/T94064#1160748, @mkroetzsch wrote:

> > @mkroetzsch Do you know of some widely used software that implements XSD 
> > 1.1 handling of BCE dates?
>
>
> Many applications that process dates are based on ISO rather than on XSD.


Which version of ISO 8901, though?

From Wikipedia: //ISO 8601:2004 (and previously ISO 8601:2000, but not ISO 
8601:1988) explicitly uses astronomical year numbering in its date reference 
systems.// https://en.wikipedia.org/wiki/0_%28year%29#ISO_8601

ISO doesn't save us, since they made the same breaking change, just a few years 
earlier. If the spec or library docs don't explicitly say whether they use 
8901:2000 or later, we might think they use ISO 8601:1988, which does the same 
as XSD 1.0: it does not allow year zero, and counts -1 as 1 BC.


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To: Smalyshev, daniel
Cc: Lydia_Pintscher, Denny, Manybubbles, daniel, mkroetzsch, Smalyshev, 
JanZerebecki, Aklapper, jkroll, Wikidata-bugs, Jdouglas, aude, GWicke



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