Query Relaxation in Cooperative Query Processing

  • Arianna D’Ulizia
  • Fernando Ferri
  • Patrizia Grifoni
Part of the Studies in Computational Intelligence book series (SCI, volume 225)


This chapter explores new trends of query relaxation strategies that allow to implement a cooperative query processing paradigm. This new paradigm is based on the belief that the user has an idea of what he/she wants and the system has to automatically lead him/her to formulate meaningful queries by relaxing query constraints. Three kinds of query relaxation mechanisms are investigated: semantic, structural and topological query relaxation. Moreover, as similarity is an important, widely used concept in the co-operative query processing since it supports the identification of objects that are close, we intend to give an extensive overview of existing similarity definitions and methodologies for evaluating it.


Query Processing Semantic Similarity Topological Relation Topological Relationship Entity Class 
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

  • Arianna D’Ulizia
    • 1
  • Fernando Ferri
    • 1
  • Patrizia Grifoni
    • 1
  1. 1.Institute of Research on Population and Social PoliciesNational Research CouncilRomeItaly

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