[Wikidata-bugs] [Maniphest] [Commented On] T230314: Show constraint violations on SDC statements

[Lucas_Werkmeister_WMDE]

Lucas_Werkmeister_WMDE added a comment.


  In T230314#5624722 , 
@Jheald wrote:
  
  > @Lucas_Werkmeister_WMDE How dependent is the wikibase constraint system on 
SPARQL ?  
  > Maarten was just suggesting that a functioning SPARQL service is required 
for //any// of the constraint checking to operate (and so this ticket would be 
completely blocked until CDQS is reliably up and running)
  
  This is not correct at all. Two constraint types, “format” and “distinct 
values”, require a SPARQL service (and disable themselves if none is 
configured); two others, “type” and “value type”, can fall back to SPARQL for 
type checks (though they first follow the statements in PHP, since contacting 
the query service is expensive) but don’t require it. All other constraint 
types are unrelated to the query service.

TASK DETAIL
  https://phabricator.wikimedia.org/T230314

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To: Lucas_Werkmeister_WMDE
Cc: Lucas_Werkmeister_WMDE, Multichill, Jheald, Aklapper, Bugreporter, 
darthmon_wmde, DannyS712, Nandana, JKSTNK, Lahi, Gq86, GoranSMilovanovic, 
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[Wikidata-bugs] [Maniphest] [Commented On] T230314: Show constraint violations on SDC statements

[Jheald]

Jheald added a comment.


  Example case to show why this is urgently needed: The property source of file 
(P7482)  is intended to show the 
broad nature of the origin of a file.
  
  In the property proposal discussion, it was agreed that this could be rolled 
out widely now for the simplest case, namely images we can reliably trust to be 
a user's own personal creation and own direct upload (eg a user's own photo of 
a monument they have taken and uploaded in the Wiki Loves Monuments campaign), 
but that for the moment uses in more complicated cases should be restricted 
until there has been more community discussion and sign-off, to make sure we 
know how we want to model such cases, before people start applying the property 
more widely.
  
  This is reflected in the following constraint specification on P7482 (see 
revision as of 2019-10-27 
)
 :
  
  - property constraint (P2302)  
= one-of constraint (Q21510859) 
- item of property constraint (P2305) 
 = original creation by uploader 
(Q66458942)   // -- list of allowed 
values : initially this is the only approved value //
- constraint status (P2302)  
= suggestion constraint (Q62026391)  
// -- show a flag warning if the above constraint is not met on a statement 
involving this property P7482, rather than the more serious exclamation mark 
warning //
- constraint clarification (P6607) 
 = "only agreed values should be 
used, other than on test images being considered in discussion environments" // 
-- explanatory message to show, if a constraint violation is flagged.  
Localised messages may exist for multiple languages. //
  
  It is urgent that warning flagging is put in place soon, before people start 
seeing P7482 "source of file" statements starting widely to appear images, and 
begin supplying their own new values, other than what is so-far the only 
community-approved value, Q66458942 "original creation by uploader".
  
  If SDC is to develop in an orderly way, visible flagging of non-conformant 
(or not yet generally consented to) statements is really needed.

TASK DETAIL
  https://phabricator.wikimedia.org/T230314

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