A Virtuoso Sponger Cartridge is used by the Virtuoso Sponger to produce RDF from various non-RDF forms.
This requires the installation of the Virtuoso
rdf_mappers VAD package, which can be installed through the
System Admin -> Packages tab of the Virtuoso Conductor.
Some Cartridges may require an API account and/or API Key be provided to access the targeted service.
This can be done through the
RDF -> Sponger tab of the Conductor:
API Keyin the dialog at the bottom of the page.