Ivan_A_Krestinin created this task.
Ivan_A_Krestinin added projects: Wikidata, Wikibase-Quality-Constraints, 
Wikibase-Quality.
Restricted Application added a subscriber: Aklapper.

TASK DESCRIPTION
  It is better to prevent writing some wrong values to Wikidata than fixing its 
after write. Data validation might be based on existing constraints system. For 
example Format constraints are very useful for this.
  
  The following changes are need to be done:
  
  1. One more possible value should be added for 
https://www.wikidata.org/wiki/Property:P2316. Something like "checked before 
write".
  2. wbcreateclaim, wbsetclaim and other edit APIs should validate incoming 
value using all constraints with "checked before write" status. The APIs should 
fail if some constraint is violated. Error message should have details about 
violated constraint.
  3. The APIs user should have ability to avoid some constraints check 
specifying some parameter. For example ignored_constraints=Q21510855. This is 
needed to work with circular links and similar cases.
  4. Wikidata UI also should validate values before write. Same as edits via 
API.
  5. Error message on UI should have button "ignore the error and write the 
value anyway".

TASK DETAIL
  https://phabricator.wikimedia.org/T291335

EMAIL PREFERENCES
  https://phabricator.wikimedia.org/settings/panel/emailpreferences/

To: Ivan_A_Krestinin
Cc: VladimirAlexiev, Lydia_Pintscher, Ivan_A_Krestinin, Aklapper, Invadibot, 
maantietaja, Akuckartz, Nandana, Lahi, Gq86, Lucas_Werkmeister_WMDE, 
GoranSMilovanovic, QZanden, Esc3300, merbst, LawExplorer, _jensen, rosalieper, 
Agabi10, Scott_WUaS, abian, Wikidata-bugs, aude, Mbch331
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