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Issue No. 03 - March (2012 vol. 24)
ISSN: 1041-4347
pp: 426-439
Wolfgang Nejdl , L3S Research Center and Leibniz Universitä t Hannover, Germany
Elena Demidova , L3S Research Center and Leibniz Universitä t Hannover, Germany
Xuan Zhou , Renmin University of China, Beijing
ABSTRACT
Databases enable users to precisely express their informational needs using structured queries. However, database query construction is a laborious and error-prone process, which cannot be performed well by most end users. Keyword search alleviates the usability problem at the price of query expressiveness. As keyword search algorithms do not differentiate between the possible informational needs represented by a keyword query, users may not receive adequate results. This paper presents IQ^P—a novel approach to bridge the gap between usability of keyword search and expressiveness of database queries. IQ^P enables a user to start with an arbitrary keyword query and incrementally refine it into a structured query through an interactive interface. The enabling techniques of IQ^P include: 1) a probabilistic framework for incremental query construction; 2) a probabilistic model to assess the possible informational needs represented by a keyword query; 3) an algorithm to obtain the optimal query construction process. This paper presents the detailed design of IQ^P, and demonstrates its effectiveness and scalability through experiments over real-world data and a user study.
INDEX TERMS
Query formulation, search process.
CITATION
Wolfgang Nejdl, Elena Demidova, Xuan Zhou, "A Probabilistic Scheme for Keyword-Based Incremental Query Construction", IEEE Transactions on Knowledge & Data Engineering, vol. 24, no. , pp. 426-439, March 2012, doi:10.1109/TKDE.2011.40
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