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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