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A Keyword-based Filtering Technique of Document-centric XML using NFA Representation  

Lee, Kyoung-Han (삼성전자 무선사업부)
Park, Seog (서강대학교 컴퓨터학과)
Publication Information
Journal of KIISE:Databases / v.33, no.5, 2006 , pp. 437-452 More about this Journal
Abstract
In this paper, we propose an extended XPath specification which includes a special matching character '%' used in the LIKE operation of SQL in order to solve the difficulty of writing some queries to filter element contents well, using the previous XPath specification. We also present a novel technique for filtering a collection of document-centric XMLs, called Pfilter, which is able to exploit the extended XPath specification. Owing to sharing the common prefix characters of the operands in value-based predicates, the Pfilter improves the performance in processing those. We show several performance studies, comparing Pfilter with Yfilter in respect to efficiency and scalability as using multi-query processing time (MQPT), and reporting the results with respect to inserting, deleting, and processing of value-based predicates. In conclusion, our approach provides a core algorithm for evaluating the contains() function of XPath queries in previous XML filtering researches, and a foundation for building XML-based distributed information systems.
Keywords
XML; filtering; value-based predicate;
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