matej_suchanek added a comment.

Quick example: biographical properties like date of birth are known or unknown but they always exist (everybody was born some time somewhere), so novalue doesn't make sense. This constraint could help catch this abuse, as well as somevalue × novalue confusions. I realize now this could be implemented together with T183092: Make an obvious way of blacklisting a value for a property.


TASK DETAIL
https://phabricator.wikimedia.org/T172129

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To: matej_suchanek
Cc: Lydia_Pintscher, Nikki, Lucas_Werkmeister_WMDE, Aklapper, matej_suchanek, PokestarFan, Lahi, Gq86, GoranSMilovanovic, QZanden, LawExplorer, Agabi10, Wikidata-bugs, aude, Mbch331
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