On Wed, May 28, 2014 at 2:48 PM, Markus Krötzsch
<mar...@semantic-mediawiki.org> wrote:
> David,
> Regarding the question of how to classify properties and how to relate them
> to items:
> * "same as" (in the sense of owl:sameAs) is not the right concept here. In
> fact, it has often been discouraged to use this on the Web, since it has
> very strong implications: it means that in all uses of the one identifier,
> one could just as well use the other identifier, and that it is
> indistinguishable if something has been said about the one or the other.
> That seems too strong here, at least for most cases.
> * In the world of OWL DL, sameAs specifically refers to individuals, not to
> classes or properties. Saying "P sameAs Q" does not imply that P and Q have
> the same extension as properties. For the latter, OWL has the relationship
> owl:equivalentProperties. This distinction of instance level and schema
> level is similar to the distinction we have between "instance of" and
> "subclass of".
> * Therefore, I would suggest to use a property called "subproperty of" as
> one way of relating properties (analogously to "subclass of"). It has to be
> checked if this actually occurs in Wikidata (do we have any properties that
> would be in this relation, or do we make it a modelling principle to have
> only the most specific properties in Wikidata?).
> * The relationship from properties to items could be modelled with the
> existing property "subject of" (P805).
> * It might be useful to also have a taxonomic classification of properties.
> For example, we already group properties into properties for "people",
> "organisations", etc. Such information could also be added with a specific
> property (this would be a bit more like a "category" system on property
> pages).

Yes. That's the way forward for now.

> On the other hand, some of this might coincide with constraint
> information that could be expressed as claims. For instance, person
> properties might be those with "Type" (i.e., "rdfs:domain") constraint
> human. By the way, our constraint system could use some systematisation --
> there are many overlaps in what you can do with one constraint or another.

I hope to have a team of students work on improving constraints
reports and everything around it later in the year. It'll depend on if
they pick this project though.


Lydia Pintscher - http://about.me/lydia.pintscher
Product Manager for Wikidata

Wikimedia Deutschland e.V.
Tempelhofer Ufer 23-24
10963 Berlin

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