JanZerebecki added a comment.

@mkroetzsch Do you know of some widely used software that implements XSD 1.1 
handling of BCE dates?

> Dates without years should not be allowed by the time datatype.




> what dates in Wikidata mean


I think the best way forward is to leave the lexical 0 in the year fraction as 
undefined in Wikidata. Yes its used, but AFAIK it was always undefined.

> If this is an important use case, then we should develop a day-of-year 
> datatype that supports this, or suggest the community to use dedicated 
> properties/qualifiers to encode this. However, other datatype extensions 
> would be much more important than this rare case (e.g., units of measurement).


I agree.


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  https://phabricator.wikimedia.org/T94064

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



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