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22nd International Conference on Data Engineering Workshops (ICDEW'06) (2006)
Atlanta, Georgia
Apr. 3, 2006 to Apr. 7, 2006
ISBN: 0-7695-2571-7
pp: 86
Sven Groppe , University of Innsbruck, Austria
Stefan B?ttcher , University of Paderborn, Germany
Jinghua Groppe , University of Innsbruck, Germany
XPath is widely used as an XML query language and is embedded in XQuery expressions and in XSLT stylesheets. In this paper, we propose a rule set which logically simplifies XPath queries by using a heuristic method in order to improve the processing time. Furthermore, we show how to substitute the XPath 2.0 intersect and except operators in a given XPath query with computed filter expressions. A performance evaluation comparing the execution times of the original XPath queries, which contain the intersect and except operators, and of the queries that are the result of our simplification approach shows that, depending on the used query evaluator and on the original query, performance improvements of a factor of up to 350 are possible.

S. Groppe, J. Groppe and S. B?ttcher, "XPath Query Simplification with regard to the Elimination of Intersect and Except Operators," 22nd International Conference on Data Engineering Workshops (ICDEW'06)(ICDEW), Atlanta, Georgia, 2006, pp. 86.
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