document: Index structures and algorithms for querying distributed RDF repositories A technical infrastructure for storing , querying and managing RDFdata is a key element in the current semantic web development . Systems like Jena , Sesame or the ICS-FORTH RDF Suite are widelyused for building semantic web applications . Currently , none ofthese systems supports the integrated querying of distributed RDF repositories . We consider this a major shortcoming since the semanticweb is distributed by nature . In this paper we present an architecture for querying distributed RDF repositories by extending the existing Sesame system . We discuss the implications of our architectureand propose an index structure as well as algorithms forquery processing and optimization in such a distributed context .
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