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This API supports both JSON-LD and RDF/XML formats, which is the Linked Open Data version of JSON (with the same syntax as JSON). The format for the response does not need to be passed along to the API, if not provided it will fall back to the default.
Coreferencing
Linking to other sources
In order to really benefit from the Web of Data, each entity has often several owl:sameAs values, which are references to the same entity in other data sources such as Wikidata, Geonames or DBpedia. This way you can traverse through various data sources in an automated way to retrieve all known information about a certain entity.