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 <thadguidry(a)gmail.com>om>:
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>
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