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Proceedings 18th International Conference on Data Engineering (2002)
San Jose, California
Feb. 26, 2002 to Mar. 1, 2002
ISBN: 0-7695-1531-2
pp: 0235
Chee-Yong Chan , Lucent Technologies
Pascal Felber , Lucent Technologies
Minos Garofalakis , Lucent Technologies
Rajeev Rastogi , Lucent Technologies
We propose a novel index structure, termed XTrie, that supports the efficient filtering of XML documents based on XPath expressions. Our XTrie index structure offers several novel features that make it especially attractive for large-scale publish/subscribe systems. First, XTrie is designed to support effective filtering based on complex XPath expressions (as opposed to simple, single-path specifications). Second, our XTrie structure and algorithms are designed to support both ordered and unordered matching of XML data. Third, by indexing on sequences of element names organized in a trie structure and using a sophisticated matching algorithm, XTrie is able to both reduce the number of unnecessary index probes as well as avoid redundant matchings, thereby providing extremely efficient filtering. Our experimental results over a wide range of XML document and XPath expression workloads demonstrate that our XTrie index structure outperforms earlier approaches by wide margins.
index structure, XPath, XML, publish-subscribe

C. Chan, P. Felber, M. Garofalakis and R. Rastogi, "Efficient Filtering of XML Documents with XPath Expressions," Proceedings 18th International Conference on Data Engineering(ICDE), San Jose, California, 2002, pp. 0235.
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