Hi,
I am investigating issues of SPARQL query federation from our knowledge graph Wikidata to prominent datasets like yours.
I noticed that queries starting on Wikidata and federating to your endpoint fail, because your endpoint only serves “Accept”: “application/sparql-results+json”, but not “Accept”: “application/sparql-results+xml”.
Do you by any chance know if this has always been like this, and whether this is intentional or a misconfiguration?