Wikidata:Property proposal/subdivision monétaire

subdivision of this unit

Originally proposed at Wikidata:Property proposal/Generic

Done: subdivision of this unit (P9059) (Talk and documentation)

Description	name of subdivision of this unit/currency
Represents	unit of measurement (Q47574)
Data type	Item
Template parameter	« sous-unité» fr:Modèle:Infobox Monnaie «subunit_name_1» en:Template:Infobox currency
Domain	unit of measurement (Q47574), monetary subunit (Q11639620)
Example 1	Danish krone (Q25417)-->öre (Q13423728)
Example 2	livre tournois (Q2670039)-->French sol (Q1003363)
Example 3	Deutsche Mark (Q16068)-->pfennig (Q165717)
Example 4	Dutch guilder (Q788472)-->cent (Q58093)
Example 5	złoty (Q123213)-->Q13648227
Example 6	pound sterling (Q25224)-->shilling (Q736526) (before 1967)
Example 7	pound sterling (Q25224)-->penny (Q234129) (after 1967)
Example 8	foot (Q3710)-->inch (Q218593)
Example 9	kilogram per mole (Q28924753)-->gram per mole (Q28924752)

Motivation

To help document which is the subdivision of that currency/that unit, which is the immediate lower unit. For decimal currencies, their "cent" and for non-decimal currencies, their immediately lower level. Bouzinac ^{💬●✒️●💛} 20:27, 13 December 2020 (UTC)[reply]

Discussion

How about calling it "subdivision of this unit" so that foot (Q3710) -> inch (Q218593) is also a valid value? ChristianKl ❪✉❫ 20:48, 13 December 2020 (UTC)[reply]
So that for another example kilogram per mole (Q28924753) would also get gram per mole (Q28924752) ? Then, if that property "smaller unit" applies to any countable unit , smaller unit would also need the reverse property : "greater group of that unit" (sorry for poor english) Bouzinac ^{💬●✒️●💛} 10:31, 16 December 2020 (UTC)[reply]
Yes, kilogram per mole (Q28924753) -> gram per mole (Q28924752) would also work. We generally avoid reverse properties in Wikidata whenever we can. While there are cases where we have them, having a property in one direction is rather a reason not to have it in the other direction then a reason to have it in the other direction. ChristianKl ❪✉❫ 11:31, 16 December 2020 (UTC)[reply]
Support ChristianKl ❪✉❫ 15:52, 17 December 2020 (UTC)[reply]
Weak support --Tinker Bell ★ ♥ 09:54, 22 December 2020 (UTC)[reply]
Question With conversion to standard unit (P2442) already existing, I'm not sure how strongly this is needed. You could query its value and check if the conversion has a value >1 in the other unit to test if its a subdivision. Are there subdivision that vary or don't have constant conversion that this would be more useful for? TB5ivVaO1y55FkAogw1X (talk) 16:16, 3 January 2021 (UTC)[reply]
Conversion are often impossible, because, for a currency (Q8142), the monetary subunit (Q11639620) is very often 1/100, but not always, as is non-decimal currency (Q7048891). But what's the name of that subdivision, and how to query it, with the actual model ? And would that query be directly usable by a wikipedia infobox ? By the way, conversion of a unit to the SI can be tricky, see for instance Q5151#P2442--Bouzinac ^{💬●✒️●💛} 18:31, 3 January 2021 (UTC)[reply]

Support That makes sense. I now see why this would be needed TB5ivVaO1y55FkAogw1X (talk) 20:18, 3 January 2021 (UTC)[reply]

@Bouzinac, ChristianKl, Tinker Bell, TB5ivVaO1y55FkAogw1X:

Done subdivision of this unit (P9059) Pamputt (talk) 14:35, 14 January 2021 (UTC)[reply]