Wikidata:Property proposal/Supports qualifier 2

supports qualifier

Originally proposed at Wikidata:Property proposal/Generic

   Done: supports qualifier (P10551) (Talk and documentation)

Description	Describes which qualifiers of the statement are supported by a reference
Data type	Property
Domain	references

Motivation

Especially for politicians I have noticed that when citing news articles these in most cases only mention either a start date or an end time of a position. This can lead to the situation that after a politician's term ends a contributor qualifies an existing statement (which already has a reference) with end time (P582) but forgets to add a new reference supporting the ending date. Because of this the already existing reference gives the impression that it supports both start and end time despite the end time actually being unsourced.

The aim of this proposal is to introduce a property which can be used to restrict a reference to a subset of the statement's qualifiers and therefore make it detectable by machine (and of course contributors) whether there are qualifiers lacking references.

Examples

position held	Mayor of New York City edit start time 1 January 2000 end time 31 December 2000 2 references stated in The New York Times title Lorem Ipsum (English) publication date 2 January 2000 supports qualifier start time stated in The Washington Post title Dolor Sit (English) publication date 1 January 2001 supports qualifier end time add reference
		add value

part of	MDAX edit start time 1 January 2000 replaces … end time 31 December 2000 replaced by … 2 references reference URL … supports qualifier start time replaces reference URL … supports qualifier end time replaced by add reference
		add value

If none of the qualifiers are supported novalue can be used as value.

Limitations

This property cannot be used if there are multiple qualifiers with the same property but different values and only a subset of the qualifiers is supported by the reference. With this property it is not possible to distinguish between different qualifiers with same property; and I would claim that with the current value types available in Wikibase this is currently not possible at all in an acceptably compact fashion. The main intention behind this property is to be used with start time and end time which should almost always have a unique value per statement, but more complex uses like for example with multiple qualifiers with excluding (P1011) are probably not possible. --Nw520 (talk) 19:37, 8 March 2022 (UTC)

Discussion

•  Comment There's also Wikidata:Property proposal/Supports qualifier from 2019 which failed, though from what I can tell mainly because of the lack of examples rather than a general opposition against the concept.
  Also, I'm still a little on the fence whether allowing novalue makes sense. If you have an opinion on that, please, feel free to share it. --Nw520 (talk) 19:37, 8 March 2022 (UTC)
•  Support Have considered similar proposals in the past and see a clear data need (need to know which references are relevant to which data). --SilentSpike (talk) 21:08, 8 March 2022 (UTC)
•  Support --Emu (talk) 22:48, 8 March 2022 (UTC)
•  Support --Shinnin (talk) 23:14, 8 March 2022 (UTC)
•  Support --Gymnicus (talk) 15:18, 9 March 2022 (UTC)
•  Support I don't think we would want to use this for all references, but I can see it being very helpful in many cases. Andrew Gray (talk) 19:34, 9 March 2022 (UTC)
•  Support Lectrician1 (talk) 23:47, 14 March 2022 (UTC)
•  Support —MasterRus21thCentury (talk) 20:59, 16 March 2022 (UTC)
•  Support --Hannes Röst (talk) 15:53, 28 March 2022 (UTC)
•  Support --BeLucky (talk) 08:54, 31 March 2022 (UTC)

 Done supports qualifier (P10551) @Nw520 @SilentSpike @Emu @Shinnin @Gymnicus @Andrew Gray @MasterRus21thCentury @Hannes Röst @BeLucky Lectrician1 (talk) 17:48, 31 March 2022 (UTC)