How To Enable Sponge?

When a new Virtuoso server is installed, the default security restrictions do not allow SPARQL endpoint users to retrieve remote RDF data. To remove this restriction, the DBA should grant "SPARQL_SPONGE" privilege to "SPARQL" account. If you are the Database Administrator and want to enable this feature, you can perform the following steps:

  1. Go to the Virtuoso Administration Conductor i.e. http://ringo.local:8890/conductor.
  2. Login as dba user.
  3. Go to System Admin->User Accounts->Roles
  4. Click the link "Edit" for "SPARQL_SPONGE"
  5. Select from the list of available user/groups "SPARQL" and click the ">>" button so to add it to the right-positioned list.
  6. Click the button "Update"
  7. Access again the sparql endpoint in order to be able to retrieve remote data.

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