An Approach for Query Decomposition on Federated SPARQL Query Systems

Abstract

Providing integrated access to data distributed over Linked Data Federations has become a major research challenge, mainly due to heterogeneity problems. In such context, this work proposes a solution for query decomposition over Linked Data Federations, i.e., sets of RDF data sources published according to the principles of Linked Data. Our main contribution lies in the definition and implementation of a query decomposition process, considering that the data sources have structurally distinct ontologies, which describe their schemas. In order to evaluate the proposed approach, a prototype was implemented and some experiments were performed.