| Josve05a added a comment. |
Current situation
Wikimedia Commons is not like any other project which Wikidata supports. Instead of ns-0 being the ones with the most content or relevance, it is the Category namespace which is 'the main thing'. This causes some problems when it comes to Wikidata and interwiki-linking. The question has been raised numerous times, but never has a clear result on both Wikidata and Commons been provided on how the category vs ns0 linking on Wikidata should be.
Example: Subject X does not have a Commons gallery (ns0) and is only has a category on Commons. Some user would create a new Wikidata item for that category since it is a non-ns0/article page. Some other user would just add it as a normal article link on the Wikidata item that already exists for the subject X. Also, someone would add it as a Commonscategory propery as well.
Subject Y has both a Commons category and a Commons gallery (ns0), and in this case the category would need a new item to be added on WIkidata, and added as a Commonscategory property.
Wikimedia Commons' categories has many categories which has "old timey" interwiki links which links to Wikipedia (ns0) articles, to circumvent them beeing needed to be added to Wikidata as a link on the subjects item, since they are not a ns0 page, but a category in the Proprty-31 sense. This causes Commons to have interwiki links to some wikis about the subject, but not all, since new articles are created, and not all wikis may have been interwiki linked (manually).
Commons vs Wikidata
One issue is that Commons users, as @Nemo_bis says, "don't care" about the guidelines which Wikidata might have about categories, and simply add it as a sitelink about the topic. The reason: It's the only known way to make sure Wikipedia articles get a link to Commons.
Way forward
- We need a better guidline on how Commons categories should be handles on Wikidata
- We need "Propery Commons Category" as well as items with "topics main subject" be treated as a interwiki link. That way when on articles on (small) Wikipedias, Commons categories could be "found" just as if they were added as a "oter sites"link. And on Commons all WIkipedias could be listed as "In WIkipedia", even if the category hasn't been added as a "other site page" to the item about the subject and not the category.
After that
We can start to import old interwiki links as "property Commons category" and they could make sure that small wikis have links to Wikimedia Commons.
Cc: Josve05a, xcombelle, Dereckson, Nemo_bis, Aklapper, Pokefan95, Acer, D3r1ck01, Izno, Wikidata-bugs, aude, El_Grafo, Jackmcbarn, Steinsplitter, Mbch331
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