Am 09.01.2017 um 04:36 schrieb Markus Kroetzsch:
> Only the "current king of Iberia" is a single person, but Wikidata is about all
> of history, so there are many such kings. The office of "King of Iberia" is
> still singular (it is a singular class) and it can have its own properties etc.
> I would therefore say (without having checked the page):
>
> King of Iberia    instance of  office
> King of Iberia    subclass of  king

To be semantically strict, you would need to have two separate items, one for
the office, and one for the class. Because the individual kinds have not been
instances of the office - they have been holders of the office. And they have
been instances of the class, but not holders of the class.

On wikidata, we often conflate these things for sake of simplicity. But when you
try to write queries, this does not make things simpler, it makes it harder.

Anything that is a subclass of X, and at the same an instance of Y, where Y is
not "class", is problematic. I think this is the root of the confusion Gerards
speaks of.

--
Daniel Kinzler
Senior Software Developer

Wikimedia Deutschland
Gesellschaft zur Förderung Freien Wissens e.V.

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