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Processing of Multiple Regular Path Expressions using PID  

Kim, Jong-Ik (서울대학교 컴퓨터공학부)
Jeong, Tae-Seon (서울대학교 컴퓨터공학부)
Kim, Hyeong-Ju (서울대학교 컴퓨터공학부)
Publication Information
Journal of KIISE:Databases / v.29, no.4, 2002 , pp. 274-284 More about this Journal
Abstract
Queries on XML are based on paths in the data graph, which is represented as an edge labeled graph model. All proposed query languages for XML express queries using regular expressions to traverse arbitrary paths in the data graph. A meaningful query usually has several regular path expressions in it, but much of recent research is more concerned with optimizing a single path expression. In this paper, we present an efficient technique to process multiple path expressions in a query. We developed a data structure named as the path identifier(PID) to identify whether two given nodes lie on the fame path in the data graph or not, and utilized the PID for efficient processing of multiple path expressions. We implement our technique and present preliminary performance results.
Keywords
XML; regular path; query processing; path identifier;
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