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Ranking Approximate Answers to Semantic Web Queries

  • Carlos A. Hurtado
  • Alexandra Poulovassilis
  • Peter T. Wood
Part of the Lecture Notes in Computer Science book series (LNCS, volume 5554)

Abstract

We consider the problem of a user querying semistructured data such as RDF without knowing its structure. In these circumstances, it is helpful if the querying system can perform an approximate matching of the user’s query to the data and can rank the answers in terms of how closely they match the original query. Our approximate matching framework allows us to incorporate standard notions of approximation such as edit distance as well as certain RDFS inference rules, thereby capturing semantic as well as syntactic approximations. The query language we adopt comprises conjunctions of regular path queries, thus including extensions proposed for SPARQL to allow for querying paths using regular expressions. We provide an incremental query evaluation algorithm which runs in polynomial time and returns answers to the user in ranked order.

Keywords

Regular Expression Edit Distance Edge Label Edit Operation Conjunctive Query 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • Carlos A. Hurtado
    • 1
  • Alexandra Poulovassilis
    • 2
  • Peter T. Wood
    • 2
  1. 1.Faculty of Engineering and SciencesUniversidad Adolfo IbáñezChile
  2. 2.School of Computer Science and Information SystemsBirkbeck, University of LondonUK

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