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CORSOS - Constraints over RDF for Semantic Processing of SPARQL

This project is funded by Deutsche Forschungsgemeinschaft, grant LA 598/7-1.


The CORSOS project (COnstraints over RDF for Semantic PrOcessing of SPARQL) aims at developing foundations, techniques, and algorithms for optimizing SPARQL queries in the context of RDF constraints. In particular, we investigate different types of constraints for RDF, how these constraints can be formalized, and the role of SPARQL in such a scenario. A special focus is on semantic query optimization for SPARQL in the presence of RDF constraints.

Software Prototypes

In CORSOS, we develop RDD, the RDF Data Description Language. Along the language, software prototypes have been implemented. These software prototypes are maintained on the associated RDD project page.

Related Publications

  • Georg Lausen, Michael Meier, Michael Schmidt:
    SPARQLing Constraints for RDF.pdf ]
    In Proc. of the 11th International Conference on Extending Database Technology (EDBT), March 2008, Nantes (France).
  • Michael Schmidt, Thomas Hornung, Norbert Küchlin, Georg Lausen, Christoph Pinkel:
    An Experimental Comparison of RDF Data Management Approaches in a SPARQL Benchmark Scenario.pdf ]
    In Proc. of the 7th International Semantic Web Conference (ISWC), October 2008, Karlsruhe (Germany).
  • Michael Meier:
    Towards Rule-based Minimization of RDF Graphs under Constraints
    In Proc. of the 2nd International Conference on Web Reasoning and Rule Systems (RR), October 2008, Karlsruhe (Germany).
  • Michael Schmidt, Thomas Hornung, Georg Lausen, Christoph Pinkel:
    SP²Bench: A SPARQL Performance Benchmark.pdf | Tech. Report ]
    In Proc. IEEE 25th International Conference on Data Engineering (ICDE), March 2009, Shanghai (China).
  • Michael Schmidt, Michael Meier, Georg Lausen:
    Foundations of SPARQL Query Optimization.pdf ]
    In Proc. 13th International Conference on Database Theory (ICDT), March 2010, Lausanne (Switzerland).
  • Michael Meier, Michael Schmidt, Fang Wei, Georg Lausen:
    Semantic Query Optimization in the Presence of Types.pdf ]
    In Proc. of Symposium on Principle of Database Systems (PODS), June 2010, Indiana (USA).

Project Members

Last modified: April 26, 2014