he LUPOSDATE SPARQL system supports various approaches to manage RDF data and process SPARQL queries: Index, RDF3X, Stream, Jena and Sesame. Jena  and Sesame  refer to third-party SPARQL engines. Index is our in-memory Engine presented in . Stream is our stream-based implementation (see ). RDF3X is a re-implementation of , but is further enhanced with additional optimization strategies.