Wikidata:Property proposal/only valid for subset

only valid for subset edit

Originally proposed at Wikidata:Property proposal/Natural science

Not done

Description	This should only be used as a qualifier. It denotes that the statement isn't true for all instances but only for a subset.
Data type	Item
Example	rectus abdominis muscle (Q275150) innervated by (P3189) sixth intercostal nerve (Q27058097) → this property → Unknown value
See also	applies to part (P518), valid in period (P1264), valid in place (P3005)

Motivation

I take information about innervation from Anatomy and Human Movement Structure and Function SIXTH EDITION (Q27050364). It tells me that in sometimes Rectus abdominis muscle (Q275150) is innervated by Sixth intercostal nerve (Q27058097) while in other cases it isn't.

I want this property to be able to enter this kind of knowledge in Wikidata. I'm personally unsure whether this is the best way to model this domain. If someone has other suggestions I'm happy. ChristianKl (talk) 14:03, 24 January 2017 (UTC)[reply]

Discussion

Maybe use applies to part (P518)? Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 16:38, 24 January 2017 (UTC)[reply]
- No, I'm pretty sure that's a different meaning than ChristianKl intends, but maybe also indicates the name is confusing. I think the meaning wanted here is effectively the difference between "sometimes" and "always". How to model that in wikidata? ArthurPSmith (talk) 18:27, 24 January 2017 (UTC)[reply]
  - I also think that applies to part (P518) has a slightly different meaning. I think it's worthwhile to have properties that can make precise statements about issues like this and it's not good to overload applies to part (P518) with slightly different meanings. A human might understand what's meant when he reads the data but an automated system might not. ChristianKl (talk) 09:56, 25 January 2017 (UTC)[reply]
Well, you need an item for the subset anyway ? So, why not just put the statement in that item and left what is valid in every case in the upper one ? author TomT0m / talk page 21:49, 25 January 2017 (UTC)[reply]

It might be that we have a source that says that this is true for 50% of the population. This information could be filled in. ChristianKl (talk) 09:09, 27 January 2017 (UTC)[reply]

How do you express "50% of the population" ? The set is not identified. Isn't this the notion of incidence (Q217690)  

or something similar you're looking for ? Or you're looking for something similar to disjoint union of (P2738)

or subclass of (P279) qualified with a numerical value representing this ? author TomT0m / talk page 11:30, 27 January 2017 (UTC)[reply]

@TomT0m:I think it's worth having a specific property for this to allow for automated interaction with the data. If you think there's a specific way this data can already be presented I invite you to edit the example of rectus abdominis muscle (Q275150) accordingly. ChristianKl (talk) 07:44, 2 February 2017 (UTC)[reply]

@TomT0m, ChristianKl: You can use proportion (P1107) to express this. --Swpb (talk) 17:19, 15 February 2017 (UTC)[reply]

@Swpb: If you think this property can be used here, could you edit the linked example accordingly? ChristianKl (talk) 17:52, 15 February 2017 (UTC)[reply]

Comment I added a few "see also" above.
--- Jura 11:47, 26 March 2017 (UTC)[reply]
I'm having difficulty understanding this proposal. I'd appreciate a few more examples. --Yair rand (talk) 17:58, 6 August 2017 (UTC)[reply]

+1 the only example value is "unknown"? --99of9 (talk) 00:23, 14 August 2017 (UTC)[reply]

Not done Inactivity, lack of support.--Micru (talk) 12:59, 15 September 2017 (UTC)[reply]