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Yann Forget, I am a French man currently living in India.
Editor on Wikimedia projects since December 2002, currently admin on Wikimedia Commons, French and English Wikisource, and much interested by WikiVoyage.
TODO
Resources
?x wdt:P131+ ?y means that there’s a “path” from ?x to ?y via P131 statements, but it can be arbitrarily long
could just be ?x wdt:P131 ?y
could also be ?x wdt:P131 ?intermediate. ?intermediate wdt:P131 ?y
?intermediate could, for example, be a suburb
or there could be two elements in between, ?x is located in a quarter which is located in a suburb which is located in a city
(city = ?y)
wdt:P279*, which you see all the time in ?item wdt:P31/wdt:P279* ?class, is the same thing, except the * means that the path could be 0 elements long too
so that means ?item has P31 of something. that something could be the ?class
or it could be something a subclass of the class, with P279
or a subclass of a subclass of the class, and so on
