Wikidata:Property proposal/values for this type

From Wikidata
Jump to navigation Jump to search

values for this type[edit]

Originally proposed at Wikidata:Property proposal/Generic

   Not done
Descriptionthe value of this qualifier is shared by all the instances/subclasses of the subject item
Data typeQuantity
Domainqualifier of properties for this type (P1963)
Allowed unitsall units
Examplecredit card (Q161380)
properties for this type
Normal rank length Arbcom ru editing.svg edit
values for this type 85.60
▼ 0 reference
+ add reference
+ add value

Motivation

It allows to indicate specific values that every instance/subclass of the subject item should have. Malore (talk) 16:08, 28 April 2018 (UTC)

Discussion

  • Symbol support vote.svg Support David (talk) 10:50, 29 April 2018 (UTC)
  • Pictogram voting comment.svg Comment I think if a class item has some quantity property, you can already now infer that all instances of this class have the same quantity value. For example, credit card (Q161380) has the statement length (P2043)  85.60mm, therefore all subclasses and instances thereof have the same length and thus properties for this type (P1963) is redundant. --Pasleim (talk) 12:20, 7 May 2018 (UTC)
  • Pictogram voting comment.svg Comment it is not the case the property values of classes are propery values of their instances. This is a common error in modelling that has been debunked many times over.
Consider, for example, the USS Carter Hall (Q2468798). It has a length of 610 ft (not represented in Wikidata, though). It is an instance of Harpers Ferry-class dock landing ship (Q1586054) (also not represented in Wikidata).
However, Harpers Ferry-class dock landing ship (Q1586054) does *not* have a length of 610 ft or indeed any other length. How can it have a length, after all - it is not a physical object. Instead it may have a design length (maybe even of 610 ft). English Wikipedia actually gets this bit right, having a general characteristics section of the InfoBox for https://en.wikipedia.org/wiki/Harpers_Ferry-class_dock_landing_ship, with a length of 609 ft 7 in.
Harpers Ferry-class dock landing ship (Q1586054) does have some property values for properties that make sense for its instances. For example, it has a short name of Harpers Ferry, which it definitely not a short name for the USS Carter Hall (Q2468798). Peter F. Patel-Schneider (talk) 15:57, 7 May 2018 (UTC)
@Peter F. Patel-Schneider: I thought the same but @Pasleim: can be right: I can't find examples of property values that are true for the class and false for the instances/suclasses. As regards your example, I think that if all instances of a class share some property value, then the class should have that property value, too: if all known stars have a temperature higher than 6000 C (I don't know if it's true), then also the star class should have such a property value.--Malore (talk) 00:08, 9 May 2018 (UTC)
  • Symbol oppose vote.svg Oppose This proposal only applies to quantitative values; item or string or other typed values may also apply through to subclasses & instances. I think we need a more general discussion of how this ought to work in wikidata - perhaps a general qualifier: is there a technique with our current WDQS system that would facilitate this at all in some way? Pinging the ontology project ArthurPSmith (talk) 14:16, 7 May 2018 (UTC)
  • Symbol oppose vote.svg Oppose This proposal needs more clarification. For example, what does "should have" mean here. Peter F. Patel-Schneider (talk) 16:01, 7 May 2018 (UTC)
  • Symbol oppose vote.svg Oppose This proposal adds to the representational power of Wikidata. Either there needs to be some Wikidata process for adding these values to instances, or every consumer of Wikidata needs to be changed to look for this information when it is looking for property values. Peter F. Patel-Schneider (talk) 16:01, 7 May 2018 (UTC)
  • Symbol oppose vote.svg Oppose The example could be expressed as credit card (Q161380)length (P2043)  85.60. People and machines thinking in formal logical might have a problem with this statement but it makes more sense and is more easily to understand for anybody else. -- JakobVoss (talk) 09:18, 16 June 2018 (UTC)

--Micru (talk) 21:46, 24 August 2014 (UTC) Tobias1984 (talk) TomT0m (talk) Genewiki123 (talk) Emw (talk) 03:09, 9 September 2014 (UTC) —Ruud 16:15, 9 December 2014 (UTC) Emitraka (talk) 14:32, 14 October 2015 (UTC) Bovlb (talk) 19:10, 21 October 2015 (UTC) Peter F. Patel-Schneider (talk) 22:21, 23 October 2015 (UTC) ArthurPSmith (talk) 15:51, 5 November 2015 (UTC) --Daniel Mietchen (talk) 20:53, 3 January 2016 (UTC) --Harmonia Amanda (talk) 22:00, 27 February 2016 (UTC) --Lechatpito (talk) --Andrawaag (talk) 14:42, 13 April 2016 (UTC) --ChristianKl (talk) 16:22, 6 July 2016 (UTC) --Cmungall Cmungall (talk) 13:49, 8 July 2016 (UTC) Cord Wiljes (talk) 16:53, 28 September 2016 (UTC) DavRosen (talk) 23:07, 15 February 2017 (UTC) Vladimir Alexiev (talk) 07:01, 24 February 2017 (UTC) Pintoch (talk) 22:42, 5 March 2017 (UTC) Fuzheado (talk) 14:43, 15 May 2017 (UTC) YULdigitalpreservation (talk) 14:37, 14 June 2017 (UTC) PKM (talk) 00:24, 17 June 2017 (UTC) Fractaler (talk) 14:42, 17 June 2017 (UTC) Andreasmperu Diana de la Iglesia Jsamwrites (talk) Finn Årup Nielsen (fnielsen) (talk) 12:39, 24 August 2017 (UTC) Alessandro Piscopo (talk) 17:02, 4 September 2017 (UTC) Ptolusque (.-- .. -.- ..) 01:47, 14 September 2017 (UTC) Gamaliel (talk) --Horcrux92 (talk) 11:19, 12 November 2017 (UTC) MartinPoulter (talk) Bamyers99 (talk) 16:47, 18 March 2018 (UTC) Malore (talk) Wurstbruch (talk) 22:59, 4 April 2018 (UTC) Dcflyer (talk) 07:50, 9 September 2018 (UTC) Ettorerizza (talk) 11:00, 26 September 2018 (UTC) Ninokeys (talk) 00:05, 5 October 2018 (UTC) Buccalon (talk) 14:08, 10 October 2018 (UTC) Jneubert (talk) 06:02, 21 October 2018 (UTC) Yair rand (talk) 00:16, 24 October 2018 (UTC) Tris T7 (talk)

Pictogram voting comment.svg Notified participants of WikiProject Ontology

  • Symbol oppose vote.svg Oppose. I agree with JakobVoss here. If there is a (default) value which applies to everything belonging to a class of things represented by the item, then we should just put a main statement on the class item itself. Deryck Chan (talk) 11:56, 2 July 2018 (UTC)
  • marking as  Not donePintoch (talk) 15:50, 4 July 2018 (UTC)