Wikidata:Property proposal/Model item

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model item[edit]

Originally proposed at Wikidata:Property proposal/Generic

   Done: model item (P5869) (Talk and documentation)
DescriptionDefines which item is a best practice example of modelling a subject, which is described by the value of this property
Data typeItem
Allowed valuesItems
Example 1human (Q5) → Douglas Adams (Q42)
Example 2politician (Q82955) → Nelson Mandela (Q8023)
Example 3animated film (Q202866) → Zootopia (Q15270647)
Planned useRecord model items for all of the most used classes on Wikidata, then gradually expand over time to include more granular concepts
Expected completenessalways incomplete (Q21873886)
See alsoWikidata:Property proposal/Model item for

Motivation[edit]

Defines which item is a best practice example of modelling a subject, which is described by the value of this property. Providing best practice examples linked from the subject will make it much easier for people to understand how to model types of items, especially new people. It will also allow a central place to decide how to model certain kinds of items.

By modelling this within the structure of Wikidata rather than in Wikiprojects the structure is multilingual. Also looking at where the model item refers to the concept we can run a standard query that will work for most cases to find all the items that the model applies to, this is not limited to ‘instance of’. This could be used to check which items do and do not have high importance statements, e.g authors without a date of birth.

This could later be complemented with another property which defines the schema for a class of item (e.g author or politician)

This property requires that the inverse property model item for also be accepted to be most useful.

Thanks

John Cummings (talk) 20:19, 11 September 2018 (UTC)[reply]

Discussion[edit]

@Jura1: Agreed, there could be a model item for 'author' and model items for '20th century French Author', 'Academic author', 'ghost writer' etc. These items are best practice examples which reflect an agreed schema, they would most probably not be the record of the schema (I'm working on that part next). --John Cummings (talk) 12:28, 12 September 2018 (UTC)[reply]
With depth I mean less than 100 statements. 10/20/50 etc. --- Jura 20:42, 12 September 2018 (UTC)[reply]
@Nepalicoi:, thanks very much for the questions. I think value constraints should be dependent on wether we can find a good way to model schemas within Wikidata items, or wether model items become in effect schemas for subjects (I'm currently trying to work out a good way to model schemas). I think the decision on which are model items should be a community decision, the most sensible way of doing this is probably a discussion on the talk page for the class item (e.g the item for author). The examples are just for illustration, they are not the decided. --John Cummings (talk) 14:44, 17 September 2018 (UTC)[reply]
I feel like it's becoming a list of items for which Sparql should be used, see Americans (Q846570) or planet (Q634) which has 10 or so values. There needs to be some constraint to prevent it from becoming a huge list of items. Nepalicoi (talk) 13:56, 26 September 2018 (UTC)[reply]

@ديفيد عادل وهبة خليل 2, Richard Nevell, Ijon, Nepalicoi, NavinoEvans, Lirazelf: @Llywelyn2000, Zyksnowy, PKM, Jason.nlw, Stinglehammer, Sabas88: @VIGNERON, John Cummings, Jura1: ✓ Done: model item (P5869). − Pintoch (talk) 21:33, 20 September 2018 (UTC)[reply]

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