Hoi,
I "abuse"  the property catalog for some time now just to get this effect. I use it to identify items that are part of a project like the "Black Lunch Table". It works really well it is used for instance to identify in queries; by associating it with a location, we know the subjects of / for an ediathon. 

The principle is the same
Thanks,
     GerardM

On 25 November 2017 at 05:42, John Erling Blad <jeblad@gmail.com> 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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