I tried this to know whether there was items who are both instance of a subclass of human and intance of human, unfortunately the query timeouts :/ https://query.wikidata.org/#prefix%20wdt%3A%20%3Chttp%3A%2F%2Fwww.wikidata.org%2Fprop%2Fdirect%2F%3E%0Aprefix%20entity%3A%20%3Chttp%3A%2F%2Fwww.wikidata.org%2Fentity%2F%3E%0ASELECT%20%3Fitem%20WHERE%20{%0A%20%20%3Fitem%20wdt%3AP31%20%3Fsub0%20.%0A%20%20%3Fsub0%20%28wdt%3AP279%29*%20entity%3AQ5%20.%0A%20%20%3Fitem%20%28wdt%3AP279%29*%20%3Fsub0%20.%0A}
2015-10-18 19:34 GMT+02:00 Thomas Douillard <thomas.douill...@gmail.com>: > Yes, in the pizza example Emw showed, the definition of "food" is > important. If what I ate this morning is a food, then pizza is a subclass > of food. This is consistent with the first sentence of > https://fr.wikipedia.org/wiki/Nourriture of frwiki. And the fact that > "pizza" is an instance of food is a mistake, unfortunately a pretty common > one on Wikidata. We should write a query to find all such examples where an > item is both an instance and a subclass of the same class. > > Now pizza is clearly a type of meal it could be relevant in a food > classification and could be very well be an instance of it, as it's a > preparation common people used to put whatever they can put on it, > similarly to https://www.wikidata.org/wiki/Q12486 > > > 2015-10-18 18:31 GMT+02:00 Thad Guidry <thadgui...@gmail.com>: > >> The main problem is that Instance Of is not being used properly >> sometimes. In general, wrong classifications across Wikidata lead to weird >> assumptions. >> >> Better documentation, and even helper rules to help prevent wrong >> classifications is what is needed and its forthcoming. >> >> Lydia has mentioned that these kinds of problems will eventually become >> less and less as the Roadmap features eventually land into production. >> >> I am looking forward to next year, and the year after, to see the quality >> improve. >> >> Thad >> +ThadGuidry <https://www.google.com/+ThadGuidry> >> >> _______________________________________________ >> Wikidata mailing list >> Wikidata@lists.wikimedia.org >> https://lists.wikimedia.org/mailman/listinfo/wikidata >> >> >
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