Download Database and XML Technologies: Third International XML by Giuseppe Castagna (auth.), Stéphane Bressan, Stefano Ceri, PDF

By Giuseppe Castagna (auth.), Stéphane Bressan, Stefano Ceri, Ela Hunt, Zachary G. Ives, Zohra Bellahsène, Michael Rys, Rainer Unland (eds.)

This booklet constitutes the refereed lawsuits of the 3rd overseas XML Database Symposium, XSym 2005, held in Trondheim, Norway in August 2005 together with VLDB 2005 and in coordination with the Database and Programming Languages Symposium, DBPL 2005.

The 15 revised complete papers have been rigorously reviewed and are preluded via a joint XSym-DBPL keynote speak. The papers are geared up in topical sections on indexing aid for the assessment of XPath and XQuery; benchmarks and algorithms for XQuery and XPath overview; algorithms for constraint delight checking, details extraction, and subtree matching; and functions of XML in info systems.

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Stack-Tree [4] solves this problem by applying an internal stack to store the subset of elements that is likely to be 36 Hanyu Li, Mong Li Lee, and Wynne Hsu used later. Index-based binary structural join solutions such as B + -tree [7], one dimensional R-tree [7], XB-tree [5] and XR-tree [11] employ different ways to “skip” elements involved in the query pattern without missing any matches. Holistic twig join methods such as XB-tree based TwigStack [5] and XR-tree based TSGeneric [12] are designed to process XML queries involving more than two nodes.

This is because we do not assign path information to value 42 Hanyu Li, Mong Li Lee, and Wynne Hsu B { 010110 } D { 010000 } F { 010000 } E F { 010000 } { 000100 } (a) branch query Text "1997" (b) value predicate Fig. 3. Examples of Super Pid Set nodes. Therefore, the element nodes with the matching path id can only satisfy the structural relationship, and not the value constraints. As a result, if an XML query has value predicates, the path id set of each node in the query pattern may not be the exact P id set.

Therefore, this extra cost is close to linear. Note that, if Algorithm 2 returns ‘no’ for all the embeddings, this does not necessarily mean that there does not exist a correct rewriting for p and q. This is because the conditions in Theorem 3 are not necessary conditions. When that happens, we may need to resort to the method based on Theorem 1 for the final judgment. ) 32 Jian Tang and Shuigeng Zhou 4 Conclusion We study the issue of query rewriting using views for XPath queries in a general setting.

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