In https://www.wikidata.org/wiki/Wikidata:SPARQL_query_service/Federation_report, we have several endpoints failing tests.
We should evaluate why this happens and either attempt to fix it or remove it from the docs. They may stay in whitelist, it doesn't hurt, but no point in advertising broken federation point.
Known problems will be listed at https://www.wikidata.org/wiki/Wikidata:SPARQL_query_service/Federation_report/issues
Current failures:
- http://bnb.data.bl.uk/sparql
- http://data.bnf.fr/sparql
- http://datos.bne.es/sparql
- http://lov.okfn.org/dataset/lov/sparql - works fine on my test
- https://api.parliament.uk/sparql - works fine on my test
- https://data.pdok.nl/sparql
- https://ld.stadt-zuerich.ch/query