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 relaxation in cooperative query processing
D'Ulizia Arianna;Ferri Fernando;Grifoni Patrizia
2009
Abstract
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.File | Dimensione | Formato | |
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