Hoi,
No. There is no such thing as "category namespace" in Wikidata. There are
items for categories. They are related to other categories through the
interwiki links but they are not linked in any other way to other queries.
The data from categories is harvested but not consistently so. When you
define what to expect in a category you will find that when you query
Wikidata, Wikidata has different items because it has more relevant items
and, there are items in the query that have not been categorised in the
category.
No, there is nothing special about categories. If anything, through queries
we can maintain the categories as well. That would be a boon for our
readers.
Thanks,
GerardM
On 12 March 2018 at 20:28, Stas Malyshev <smalys...@wikimedia.org> wrote:
> Hi!
>
> > Are all data that can be fetched via SPARQL CC0-licensed?
>
> Data in the main namespace, without the use of federation - yes.
> Federated data - https://query.wikidata.org/copyright.html, federated
> endpoints can have different licenses, either CC0-like or CC-BY-SA like
> (I don't think we accepted any that have anything stricter than that)
> Category namespace - since it comes from Wikipedias, it's CC-BY-SA I
> assume.
>
> --
> Stas Malyshev
> smalys...@wikimedia.org
>
> _______________________________________________
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> Wikidata@lists.wikimedia.org
> https://lists.wikimedia.org/mailman/listinfo/wikidata
>
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