Exploring RDFS KBs Using Summaries

  • Georgia TroullinouEmail author
  • Haridimos Kondylakis
  • Kostas Stefanidis
  • Dimitris Plexousakis
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 11136)


Ontology summarization aspires to produce an abridged version of the original data source highlighting its most important concepts. However, in an ideal scenario, the user should not be limited only to static summaries. Starting from the summary, s/he should be able to further explore the data source requesting more detailed information for a particular part of it. In this paper, we present a new approach enabling the dynamic exploration of summaries through two novel operations zoom and extend. Extend focuses on a specific subgraph of the initial summary, whereas zoom on the whole graph, both providing granular information access to the end-user. We show that calculating these operators is NP-complete and provide approximations for their calculation. Then, we show that using extend, we can answer more queries focusing on specific nodes, whereas using global zoom, we can answer overall more queries. Finally, we show that the algorithms employed can efficiently approximate both operators.


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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  • Georgia Troullinou
    • 1
    Email author
  • Haridimos Kondylakis
    • 1
  • Kostas Stefanidis
    • 2
  • Dimitris Plexousakis
    • 1
  1. 1.ICS-FORTHHeraklionGreece
  2. 2.University of TampereTampereFinland

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