mkroetzsch added a comment. @Smalyshev @Lydia_Pintscher Dates without years should not be allowed by the time datatype. They are impossible to order, almost impossible to query, and they do not have any meaning whatsoever in combination with a preferred calendar model. All the arguments @Denny has already given elsewhere for why we should unify dates to Proleptic Gregorian internally apply here too. My suspicion is that the existing dates of this form are simply a glitch in the UI, where users got the impression that dates without years are recognized and pressing "save" silently set the year to zero without them seeing the change in meaning. 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).
The above proposal of @Smalyshev is simply to use RDF 1.0 for export and to assume XSD 1.0 (non-ISO) dates to be used in Wikidata. After all the discussion here, I am completely baffled by this proposal. It goes against all current standards, and against the view of the SPARQL working group. The additional proposal to revert to the "dates are just strings" view for deep values ignores the original design and documentation, and dismisses the recommendations that Denny and I have been making via email. It seems we have reached an impasse here. **I suggest to freeze the RDF-time encoding discussions now** until we have established a joint understanding what dates in Wikidata mean. As soon as we export dates to RDF, we are defining their meaning indirectly via the RDF semantics, and this bug report is not the right place for doing this. TASK DETAIL https://phabricator.wikimedia.org/T94064 REPLY HANDLER ACTIONS Reply to comment or attach files, or !close, !claim, !unsubscribe or !assign <username>. EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: Smalyshev, mkroetzsch Cc: Lydia_Pintscher, Denny, Manybubbles, daniel, mkroetzsch, Smalyshev, JanZerebecki, Aklapper, jkroll, Wikidata-bugs, Jdouglas, aude, GWicke _______________________________________________ Wikidata-bugs mailing list Wikidata-bugs@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-bugs
