Comparative Preferences in SPARQL

  • Peter F. Patel-SchneiderEmail author
  • Axel Polleres
  • David Martin
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 11313)


Sometimes one does not want all the solutions to a query but instead only those that are most desirable according to user-specified preferences. If a user-specified preference relation is acyclic then its specification and meaning are straightforward. In many settings, however, it is valuable to support preference relations that are not acyclic and that might not even be transitive, in which case though their handling involves some open questions. We discuss a definition of desired solutions for arbitrary preference relations and show its desirable properties. We modify a previous extension to SPARQL for simple preferences to correctly handle any preference relation and provide translations of this extension back into SPARQL that can compute the desired solutions for all preference relations that are acyclic or transitive. We also propose an additional extension that returns solutions at multiple levels of desirability, which adds additional expressiveness over prior work. However, for the latter we conjecture that an effective translation to a single (non-recursive) SPARQL query is not possible.


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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  • Peter F. Patel-Schneider
    • 1
    Email author
  • Axel Polleres
    • 2
    • 3
  • David Martin
    • 1
  1. 1.NAIL Laboratory, Nuance CommunicationsSunnyvaleUSA
  2. 2.Vienna University of Economics and Business/Complexity Science Hub ViennaWienAustria
  3. 3.Stanford UniversityStanfordUSA

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