Hi!
I've added more endpoint to SPARQL federation whitelist, including
attribution-licensed ones. Please see the full list in the User
Manual[1]. All endpoints are acknowledged at WDQS Licensing page[2].
You are welcome to nominate new endpoints at Wikidata SPARQL federation
input[3] page. I've made some cleanups and edits there to make
nominating easier, hopefully that helps. Examples and links to any
materials showing how to integrate data between endpoints are very
welcome too.
[1]
https://www.mediawiki.org/wiki/Wikidata_query_service/User_Manual#Federation
[2]
https://query.wikidata.org/copyright.html
[3]
https://www.wikidata.org/wiki/Wikidata:SPARQL_federation_input
Thanks,
--
Stas Malyshev
smalyshev(a)wikimedia.org