On mið 26.ágú 2015 13:58, Peter F. Patel-Schneider wrote:
I don't think that P21
(
https://www.wikidata.org/wiki/Property:P21, sex or
gender) is a subclass of P31 (
https://www.wikidata.org/wiki/Property:P31,
instance of). Properties aren't subclasses in general.
Perhaps you meant to talk about
https://www.wikidata.org/wiki/Property:P21
(sex or gender) being related via (
https://www.wikidata.org/wiki/Property:P31
(instance of) to
https://www.wikidata.org/wiki/Q18608871 (Wikidata property
for items about people). This indicates that the property should only be
used on people, even though the description of the property itself talks about
its use on animals.
It appears that Wikidata is not very consistent internally.
peter
Sorry, I'm not used to the Wikidata lingo.
To further explain my point (to which I think you have already agreed to):
If I were to produce a code which makes assumptions based on such
relations, the code would come to the contradiction that a non-human
with a P21 relation is a human, if it were to recursively travel via in
the hierarchy of declarations. P21 is declared with a P31->Q18608871 and
Q18608871 is in turn declared P1269->Q5. Unless special precautions
would be taken, anyone trying to generate an exhaustive list of all
humans on Wikidata (without relying solely on the direct declaration on
each item), they might find themselves with non-humans on that list due
to travelling backwards via such relations.
In essence, it seems like P21 either wrongfully allows definitions of
genders of non-humans or that the property is too broad for a
declaration of P31->Q18608871.
- Svavar Kjarrval