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This paper discusses RDF related work in the context of OpenLink Virtuoso, a general purpose relational / federated database and applications platform. This paper discusses adapting a relational engine for native RDF support with dedicated data types, bitmap indexing and SQL optimizer techniques. This paper further discusses mapping existing relational data into RDF for SPARQL access without converting the data into physical triples. These paper present conclusions and metrics as well as a number of use cases, from DBpedia to bio informatics and collaborative web applications.
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