Virtuoso Sponger Cartridge
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.
Registering API Key
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: 
- Select the cartridge from the list provided.
 - Enter the 
API AccountandAPI Keyin the dialog at the bottom of the page. - Click Update to save, as shown: