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Federated SPARQL Search

Federated SPARQL search provides access to remote SPARQL Endpoints so that a query service can retrieve information from several data sources. Federated search provides a single entry point to multiple data sources. A SERVICE clause in the body of a SPARQL query can be used to call on a remote SPARQL Endpoint.

Examples​

  • The following example shows an empty SPARQL query.
SELECT [...]
WHERE {
     SERVICE <http://example1.example.org/sparql> {
          [...]
          OPTIONAL {
               [...]
               SERVICE <http://example2.example.org/sparql> {
                    [...]   }   }
     }
}

Further Resources​