2015-10-19 4:44 GMT+02:00 Emw <emw.wiki(a)gmail.com>om>:
This problem is especially acute in chemistry on
Wikidata, where chemical
elements use "*instance of *chemical element*" *even though it has been
established that chemical compounds should not use "*instance of*
chemical compound" [
As we discussed many times, it's natural to model "chemical element" as
"type of substance" or "type of atom" depending on the definintion
you
take. But no question elements are either subclass of substance of subclass
of atom however. It's a natural case of metamodeling, similarly to the "car
model" example. And no, using instance of has not be proven to be incorrect
at all.