Dario's 1-3 is fine by me. Rather than P361 (part of), I think - as James Heald - that P972 (catalog) would be better. It is also used for artworks, for instance,
https://www.wikidata.org/wiki/Q44015154 P972 https://www.wikidata.org/wiki/Q42661788
I see P972 and the associated identifier P528 as a kind of lightweight external identifier.
If the external dataset is available in RDF, then I suppose skos:exactMatch (P2888) can be used.
For some items available in other databases I have used "external data available at" P1325. But the semantics of that require some data at the other end.
--- Finn Årup Nielsen http://people.compute.dtu.dk/faan/
On 11/25/2017 02:16 PM, James Heald wrote:
Like others in this thread, I would caution *against* overloading P31 "instance of" if possible.
When a somewhat similar issue came up, re how to artists that were of interest the the "Black Lunch Table" project https://www.wikidata.org/wiki/Q28781198 that works on coverage of visual artists of the African diaspora, the solution adopted (after quite a vigorous debate at Project Chat) was to use property P972 "catalog" with the value Q28781198 to mark artists that were of interest to the project.
A similar approach could be used here, if a project has a list of works of interest, that it would be valuable to record inclusion in.
Best regards,
James.
On 25/11/2017 04:42, John Erling Blad wrote:
Implicit heterogeneous unordered containers where members sees a homogeneous parent. The member properties should be transitive to avoid the maintenance burden, like a "tracking property", and also to make the parent item manageable.
I can't see anything that needs any kind of special structure at the entity level. Not even sure whether we need a new container for this, claims are already unordered containers.
On Sat, Nov 25, 2017 at 1:25 AM, Andy Mabbett andy@pigsonthewing.org.uk wrote:
On 24 November 2017 at 23:30, Dario Taraborelli dtaraborelli@wikimedia.org wrote:
I'd like to propose a fairly simple solution and hear your feedback on whether it makes sense to implement it as is or with some modifications.
create a Wikidata class called "Wikidata item collection" [Q-X]
This sounds like Wikimedia categories, as used on Wikipedia and Wikimedia Commons.
-- Andy Mabbett @pigsonthewing http://pigsonthewing.org.uk
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