TomT0m added a comment.

  Another option : specify a class of exceptions. A property « exception class »
  
  If an item is an instance of the execption class, then the constraint is not 
relevant.
  
  In spirit, if we require for example items with a birth date to have a death 
date, and if we have a subclass of « fiction human », say « immortal », that 
should actually not have one
  
    birth date :
        constraint : requires statement
               property        : death date
               exception class : immortal
  
  Which reads in english « any item with a birth date should have a death date 
except immortal instances »

TASK DETAIL
  https://phabricator.wikimedia.org/T169374

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To: TomT0m
Cc: TomT0m, Lucas_Werkmeister_WMDE, Lydia_Pintscher, Liuxinyu970226, Aklapper, 
Bugreporter, darthmon_wmde, DannyS712, Nandana, Lahi, Gq86, GoranSMilovanovic, 
QZanden, LawExplorer, _jensen, rosalieper, Agabi10, Wikidata-bugs, aude, Mbch331
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