CORNER: A Completeness Reasoner for SPARQL Queries Over RDF Data Sources

Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 8798)

Abstract

With the increased availability of data on the Semantic Web, the question whether data sources offer data of appropriate quality for a given purpose becomes an issue. With CORNER, we specifically address the data quality aspect of completeness. CORNER supports SPARQL BGP queries and can take RDFS ontologies into account in its analysis. If a query can only be answered completely by a combination of sources, CORNER rewrites the original query into one with SPARQL SERVICE calls, which assigns each query part to a suitable source, and executes it over those sources. CORNER builds upon previous work by Darari et al. [1] and is implemented using standard Semantic Web frameworks.

Keywords

Data quality Data completeness Query completeness SPARQL 

References

  1. 1.
    Darari, F., Nutt, W., Pirrò, G., Razniewski, S.: Completeness statements about RDF data sources and their use for query answering. In: Alani, H., et al. (eds.) ISWC 2013, Part I. LNCS, vol. 8218, pp. 66–83. Springer, Heidelberg (2013)Google Scholar
  2. 2.
    Levy, A.Y.: Obtaining complete answers from incomplete databases. In: PVLDB (1996)Google Scholar
  3. 3.
    Razniewski, S., Nutt, W.: Completeness of queries over incomplete databases. In: PVLDB (2011)Google Scholar
  4. 4.
    Harris, S., Seaborne, A.: SPARQL 1.1 query language. Technical report, W3C (2013)Google Scholar

Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • Fariz Darari
    • 1
  • Radityo Eko Prasojo
    • 1
  • Werner Nutt
    • 1
  1. 1.Faculty of Computer ScienceFree University of Bozen-BolzanoBolzanoItaly

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