On mið 26.ágú 2015 23:05, James Heald wrote:
There are a *lot* of problems with P279 (subclass),
right across
Wikidata.
These will only be corrected once people start doing searches in a
systematic way and addressing the anomalies they find.
In this case, politician (Q82955) should *not* be a subclass of human
(Q5), instead it should be a subclass of something like occupation
(Q13516667), or alternatively perhaps profession (Q28640).
My understanding is that currently there are a vast number of
incorrect subclass relationships in the project, messing up tree
searches, and so far it is something that has simply not yet been
systematically addressed.
-- James.
For now, what's the best way to find (and perhaps correct) incorrect
declarations like these?
If I were to just change items for commonly used items like politician
(Q82955) it might be construed as vandalism or someone who doesn't care
about or understand the Stubbs-declared-as-a-human problem might just
add that declaration back later.
When it comes to the gender property (P21), the human readable
description indicates that it's to define genders in general, yet it's
declared as an instance of an item (Q18608871) which only applies to
humans, which of course has consequences further up in the hierarchy
since the maintainers of item Q18608871 faithfully assume it only
applies to humans.
In the case of the hierarchy Stubbs is associated with the maintainers
have assumed all mayors are, without exception, humans or they somehow
thought that if there were exceptions to this, the machines could
somehow detect and apply them in each case. Both of those methods are, I
think we agree, are wrong and we should find out why it's happening.
Is there a tool where one can put in a Wikidata item and it extracts
declarations based on "higher" properties like subclass or instance of?
Like if I were to input the item for Stubbs, it would travel the
hierarchy and tell me what would be assumed about Stubbs based on the
declarations further up in the tree.
- Svavar Kjarrval