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Indexing and Querying XML Data for Regular Path Expressions (2001)
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| Venue: | IN VLDB |
| Citations: | 343 - 9 self |
BibTeX
@INPROCEEDINGS{Li01indexingand,
author = {Quanzhong Li and Bongki Moon},
title = {Indexing and Querying XML Data for Regular Path Expressions},
booktitle = {IN VLDB},
year = {2001},
pages = {361--370},
publisher = {}
}
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Abstract
With the advent of XML as a standard for data representation and exchange on the Internet, storing and querying XML data becomes more and more important. Several XML query languages have been proposed, and the common feature of the languages is the use of regular path expressions to query XML data. This poses a new challenge concerning indexing and searching XML data, because conventional approaches based on tree traversals may not meet the processing requirements under heavy access requests. In this paper, we propose a new system for indexing and storing XML data based on a numbering scheme for elements. This numbering scheme quickly determines the ancestor-descendant relationship between elements in the hierarchy of XML data. We also propose several algorithms for processing regular path expressions, namely, (1) ##-Join for searching paths from an element to another, (2) ##-Join for scanning sorted elements and attributes to find element-attribute pairs, and (3) ##-Join for finding Kleene-Closure on repeated paths or elements. The ##-Join algorithm is highly effective particularly for searching paths that are very long or whose lengths are unknown. Experimental results from our prototype system implementation show that the proposed algorithms can process XML queries with regular path expressions by up to an or- # This work was sponsored in part by National Science Foundation CAREER Award (IIS-9876037) and Research Infrastructure program EIA-0080123. The authors assume all responsibility for the contents of the paper. Permission to copy without fee all or part of this material is granted provided that the copies are not made or distributed for direct commercial advantage, the VLDB copyright notice and the title of the publication and its...
Keyphrases
xml data regular path expression numbering scheme conventional approach vldb copyright notice xml query direct commercial advantage several xml query language common feature sorted element national science foundation career award new system heavy access request research infrastructure program eia-0080123 several algorithm data representation tree traversal element-attribute pair prototype system implementation show join algorithm processing requirement new challenge repeated path experimental result ancestor-descendant relationship
