Abstract

To deal with the problem of the empty or too little answers returned from XML documents, this paper proposes a method of relaxing contextual preference, that is, preferences whose query results depend on the context at the time of their submission. In this paper, firstly, we define a contextual preference model in XML. Moreover, we introduce relaxing context operators, which may be produced by relaxing one or more of its context attributes. Furthermore, contextual preferences are stored in a data structure, called the profile tree. Finally, we automatically obtain preference scores using association rules mining in the profile tree. Results of a preliminary user study demonstrate that our method can capture the user's preferences effectively. The efficiency and effectiveness of the approach are also demonstrated by experimental results.

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