Hi!

> Dear Wikidata developers and contributors,
>
> I see that it is currently not possible to run federated queries from
> wikidata to other sparql endpoints. I understand why you are not
> allowing this in the general case. However, it would be nice to allow
> this in the special case.
>
> Would a patch allowing limited known remote sparql endpoints to
> org.wikidata.query.rdf.blazegraph.WikibaseContextListener
> be possible?

Technically, it is possible and shouldn't be very hard to do. We need to
figure out which endpoints we want to allow.