| Ghuron added a comment. |
I'd like to explain another scenario, where this functionality can be useful. Ru-wiki infoboxes sometimes add categories to the corresponding articles. Sometimes we do this based on wikidata, but we are pretty much limited to a few cases, defined in P1465, P1792, P1464 or very special usage of P910 (e.g. if astronomical object belongs to some constellation). If I want to automatically place categories like Q8454640 to the films, directed by James Marsh, I probably would need a designated property. Alternatively I should be able to do it via extracting items that has P971:Q2720543 and simultaneously P971:Q29017630. This may sound like reinventing SPARQL queries, but getting results of getBacklinks(Q2720543) and getBacklinks(Q29017630) and performing list intersection in lua would work for me.
Cc: Uzume, Aklapper, Ghuron, Lahi, Gq86, GoranSMilovanovic, Soteriaspace, Jayprakash12345, JakeTheDeveloper, QZanden, LawExplorer, Wikidata-bugs, aude, TheDJ, Mbch331
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