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The XP-table: Runtime-efficient Region-based Structure for Collective Evaluation of Multiple Continuous XPath Queries  

Lee, Hyun-Ho (안양과학대학 컴퓨터정보학부)
Lee, Won-Suk (연세대학교 컴퓨터과학과)
Publication Information
Journal of KIISE:Databases / v.35, no.4, 2008 , pp. 307-318 More about this Journal
Abstract
One of the primary issues confronting XML message brokers is the difficulty associated with processing a large set of continuous XPath queries over incoming XML seams. This paper proposes a novel system designed to present an effective solution to this problem. The proposed system transforms multiple XPath queries before their run-time into a new region-based data structure, called an XP-table, by sharing their common constraints. An XP-table is matched with a stream relation (SR) transformed from a target XML stream by a SAX parser. This arrangement is intended to minimize the runtime workload of continuous query processing. Also, system performance is estimated and verified through a variety of experiments, including comparisons with previous approaches such as YFilter and LazyDFA. The proposed system is practically linear- scalable and stable for evaluating a set of XPath queries in a continuous and timely fashion.
Keywords
XML stream; multiple continuous XPath queries; XP-table; region based structure; stream relation (SR);
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Times Cited By KSCI : 1  (Citation Analysis)
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