On 09.01.2015 00:53, Lydia Pintscher wrote:
...
I like the property-centric approach of wikidata, but is there a notion of
subproperties for contextual refinement? I only found this:
https://www.wikidata.org/wiki/Property:P1647
Yes that is all there is. For a usage example see
https://www.wikidata.org/wiki/Property:P9 (The value is currently not
linked in that statement. That will be fixed with the next deployment
next week.)
Yes, and using subproperty relationships in queries etc. is a next step
(we only have had statements on property pages for a few weeks now ...).
I fully agree that this will make many modelling issues easier to handle
(a very broad relationship "associated with country" can be a
subperproperty of more specific relations like "had first public
performance in country" (for bands), so one can have a clear meaning as
well as broad coverage.
However, other related issues occur in many places, even without
properties and classes involved. For example, we have many occupations,
but there is no reasoning to relate broader occupations to more specific
ones when used as values of the "occupation" property (Catholic priests
are priest; computer scientists are researchers; etc. -- right now it
seems one would have to state all of these, since there is no way of
saying that the occupation property should be transitive over the
subclass of property). We have only just started to use the most basic
schema-level modelling in Wikidata so far, but we need to take one step
after the other.
Markus
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