The option to generate RDF from the action using "osdb:output_type" : "generate_rdf"
is dependent on there being an RDF generator, i.e. a Virtuoso Sponger cartridge, configured for the service, or that the service can output RDF directly.
If a service is configured to generate RDF through a Virtuoso Sponger cartridge, the configuration can also include the option to view the RDF in an RDF
viewer. Virtuoso supports several RDF viewers.