Help talk:Property constraints portal/Required qualifiers
Modeling of multiple qualifiers in constraint statements
editHow do we model a constraint with multiple mandatory qualifiers, e. g. “stock exchange (P414) must have both ticker symbol (P249) and start time (P580)”, in constraint statements? I see two possibilities:
- One statement:
- Two statements:
If we choose the second one, then we can instead interpret the first statement as “stock exchange (P414) must have at least one of ticker symbol (P249) and start time (P580)”. This would increase the expressive power of the constraint type, but at the cost of making it potentially more confusing: I suspect that the first possibility is the more natural one.
(I’m not sure who to ping for this discussion, but I think at least JakobVoss (talk • contribs • logs), Ivan A. Krestinin (talk • contribs • logs) and Jonas Kress (WMDE) (talk • contribs • logs) could be interested – feel free to include more.)
--Lucas Werkmeister (WMDE) (talk) 20:45, 19 May 2017 (UTC)
- "One statement" possibility does not allow to mark one constraint as "mandatory" and another as usual constraint. It is detected as error by Module:Constraints. — Ivan A. Krestinin (talk) 21:09, 19 May 2017 (UTC)
- Your remark about “mandatory” is a very good point, thanks.
- Just to make sure I’m understanding you correctly – your module reports an error if a property constraint (P2302)required qualifier constraint (Q21510856) statement has more than one property (P2306) qualifier? --Lucas Werkmeister (WMDE) (talk) 21:34, 19 May 2017 (UTC)
- Yes, see Property talk:P369 as example. — Ivan A. Krestinin (talk) 22:24, 19 May 2017 (UTC)
- Okay, that’s good to know, then we’ll do the same in the QualityConstraints extension for now, and if we ever need “must have either qualifier 1 or qualifier 2” we can revisit this. Thanks! --Lucas Werkmeister (WMDE) (talk) 08:27, 20 May 2017 (UTC)
- Five years later
- for social media followers (P8687), it could be interesting to define to groups of required qualifiers:
- 1. point in time (P585)
- 2. one for the account: P2003 P6552 etc.
- --- Jura 12:56, 9 January 2022 (UTC)
- Okay, that’s good to know, then we’ll do the same in the QualityConstraints extension for now, and if we ever need “must have either qualifier 1 or qualifier 2” we can revisit this. Thanks! --Lucas Werkmeister (WMDE) (talk) 08:27, 20 May 2017 (UTC)
- Just to make sure I’m understanding you correctly – your module reports an error if a property constraint (P2302)required qualifier constraint (Q21510856) statement has more than one property (P2306) qualifier? --Lucas Werkmeister (WMDE) (talk) 21:34, 19 May 2017 (UTC)
Notified participants of WikiProject property constraints --- Jura 10:21, 10 January 2022 (UTC)