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Journal of Zhejiang University SCIENCE A 2009 Vol.10 No.12 P.1769~1783

http://doi.org/10.1631/jzus.A0920006


Efficient processing of ordered XML twig pattern matching based on extended Dewey


Author(s):  Jin-hua JIANG, Ke CHEN, Xiao-yan LI, Gang CHEN, Li-dan SHOU

Affiliation(s):  School of Computer Science and Technology, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   jiangjinhua.zju@163.com

Key Words:  XML querying, Ordered twig join, Index, Optimization


Jin-hua JIANG, Ke CHEN, Xiao-yan LI, Gang CHEN, Li-dan SHOU. Efficient processing of ordered XML twig pattern matching based on extended Dewey[J]. Journal of Zhejiang University Science A, 2009, 10(12): 1769~1783.

@article{title="Efficient processing of ordered XML twig pattern matching based on extended Dewey",
author="Jin-hua JIANG, Ke CHEN, Xiao-yan LI, Gang CHEN, Li-dan SHOU",
journal="Journal of Zhejiang University Science A",
volume="10",
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year="2009",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A0920006"
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%A Jin-hua JIANG
%A Ke CHEN
%A Xiao-yan LI
%A Gang CHEN
%A Li-dan SHOU
%J Journal of Zhejiang University SCIENCE A
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%N 12
%P 1769~1783
%@ 1673-565X
%D 2009
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A0920006

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T1 - Efficient processing of ordered XML twig pattern matching based on extended Dewey
A1 - Jin-hua JIANG
A1 - Ke CHEN
A1 - Xiao-yan LI
A1 - Gang CHEN
A1 - Li-dan SHOU
J0 - Journal of Zhejiang University Science A
VL - 10
IS - 12
SP - 1769
EP - 1783
%@ 1673-565X
Y1 - 2009
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A0920006


Abstract: 
Finding all occurrences of a twig pattern is a core operation of extensible markup language (XML) query processing. Holistic twig join algorithms, which avoid a large number of intermediate results, represent the state-of-the-art algorithms. However, ordered XML twig join is mentioned rarely in the literature and previous algorithms developed in attempts to solve the problem of ordered twig pattern (OTP) matching have poor performance. In this paper, we first propose a novel children linked stacks encoding scheme to represent compactly the partial ordered twig join results. Based on this encoding scheme and extended Dewey, we design a novel holistic OTP matching algorithm, called OTJFast, which needs only to access the labels of the leaf query nodes. Furthermore, we propose a new algorithm, named OTJFaster, incorporating three effective optimization rules to avoid unnecessary computations. This works well on available indices (such as B+-tree), skipping useless elements. Thus, not only is disk access reduced greatly, but also many unnecessary computations are avoided. Finally, our extensive experiments over both real and synthetic datasets indicate that our algorithms are superior to previous approaches.

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Reference

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