Keywords: XML query, indexing, labeling, DataGuide, region encoding, query optimization
Received May 31, 2007; revised December 3; accepted April 24, 2008.
Communicated by Jonathan Lee.
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Su-Cheng Haw and Chien-Sing Lee
Department of Electrical and Computer Engineering
Faculty of Information Technology
Multimedia University
63100 Cyberjaya, Malaysia
E-mail: {schaw, cslee}@mmu.edu.my
With the rapid emergence of XML as an enabler for data exchange and data transfer
over the Web, querying XML data has become a major concern. In this paper, we present
a hybrid system, TwigX-Guide; an extension of the well-known DataGuide index and region
encoding labeling to support twig query processing. With TwigX-Guide, a complex
query can be decomposed into a set of path queries, which are evaluated individually by
retrieving the path or node matches from the DataGuide index table and subsequently
joining the results using the holistic twig join algorithm TwigStack. TwigX-Guide improves
the performance of TwigStack for queries with parent-child relationships and
mixed relationships by reducing the number of joins needed to evaluate a query. Experimental
results indicate that TwigX-Guide can process twig queries on an average 38%
better than the TwigStack algorithm, 30% better than TwigINLAB, 10% better than
TwigStackList and about 5% better than TwigStackXB in terms of execution time.
Received May 31, 2007; revised December 3; accepted April 24, 2008.
Communicated by Jonathan Lee.