Beyond Classical SERVICE Clause in Federated SPARQL Queries: Leveraging the Full Potential of URI Parameters

Semantic Web applications integrating very different software and data sources have to face the heterogeneity of the quality and compliance to standards exhibited by each involved resource. In this paper we propose a uniform way of adapting and customizing the behavior of both the client and the server components of an HTTP exchange to cope with this diversity. We revisit the classical SERVICE clause in SPARQL federated queries in order to parameterize the behavior of both the SPARQL client and the SPARQL service. We propose mechanisms to identify and specify SPARQL federated query services and extended SPARQL-based services.