| Jheald added a comment. |
In the context of this thread, it's worth recalling the ongoing wish from Commons users for Commons categories to be able to have their own local items on the Commons wikibase.
At the moment only items on Wikidata itself are available to store structured data for Commons categories. This is okay so far as it goes -- currently there are about 2.1 million Wikidata items linked to Commons categories and supporting "wikidata infobox", which have been very well received.
But that is still under 30% of all Commons categories, and the Wikidata community has some very considerable reservations about extending it further -- see for example this discussion recently at Project Chat.
It would be highly desirable to be able to store structured data for all 7.3 million Commons categories -- and in particular for categories for complex intersections of topics, and for "non-notable" people, both of which are rather unwelcome on Wikidata. Being able to document, by wikibase statements, what these categories relate to would be hugely helpful, to
- support wikibase-derived infoboxes, to explain the meaning of the category internationally and multilingually
- allow internationalised labels and descriptions to be added -- a long-time Commons request
- allow volunteers to work together to build up a structured understanding of the meaning of Commons categories
- gather the understanding of the meaning categories needed to translate a file's membership of a category into appropriate Commons wikibase statements for the file -- hugely important if we want Commons wikibase to get populated
- identify gaps on WIkidata -- ie 'simple' things (people, places, ideas etc) not currently represented on Wikidata, but present in the Commons ontology
- in the reverse direction, make it possible for wikibase statements on files to be used to verify, extend or refine the categorisation of those files -- making categories more systematic and thorough and complete
All of this becomes possible for volunteers to work on, if local Commons wikibase items can be available for Commons categories.
Distinguishing these local items via a prefix, eg c:Q1234, as opposed to plain Q2345 on Wikidata, would seem a very acceptable way to allow both them and Wikidata items to exist and each be referenced.
Cc: Jheald, matthiasmullie, Smalyshev, Lydia_Pintscher, Addshore, MarkTraceur, WMDE-leszek, Cparle, Jdforrester-WMF, Abit, EBjune, Ramsey-WMF, Aklapper, daniel, Nandana, JKSTNK, Lahi, PDrouin-WMF, Gq86, E1presidente, Anooprao, SandraF_WMF, GoranSMilovanovic, QZanden, Tramullas, Acer, LawExplorer, Silverfish, Poyekhali, _jensen, D3r1ck01, Susannaanas, Wong128hk, Jane023, Wikidata-bugs, Base, aude, El_Grafo, Dinoguy1000, Ricordisamoa, Wesalius, Fabrice_Florin, Raymond, Steinsplitter, Mbch331
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