Hi!
Can it all be done in SPARQL against some services
that already expose
WP subcategories given a specific category ? Or is there an API that
does this already ? other tools that might expose WP categories ?
I don't think subcategory relationship is not recorded in Wikidata. E.g.
https://www.wikidata.org/wiki/Q7361750 contains
https://www.wikidata.org/wiki/Q14436424 but neither have any indication
of that.
The problem I guess is that category hierarchy is different on all
wikis, so it's hard to have one property that expresses it on Wikidata.
You could do through "subclass of" and "category's main topic" but
not
sure that'd capture all. E.g.:
http://tinyurl.com/h7qpcdn but that only
captures one subcategory, since other items don't have the same
hierarchy in Wikidata.
--
Stas Malyshev
smalyshev(a)wikimedia.org