By Changxuan Wan, YunSheng Liu (auth.), Xiaofeng Meng, Jianwen Su, Yujun Wang (eds.)
This publication constitutes the refereed lawsuits of the 3rd foreign convention on Web-Age info administration, WAIM 2002 held in Beijing, China in August 2002.
The forty papers provided including approach demonstrations have been rigorously reviewed and chosen from 169 submissions. The papers are geared up in topical sections on XML; spatio-temporal databases; information mining and studying; XML and net; workflows and e-services; bio informatics, perspectives, and OLAP; clustering and high-dimensional info; internet seek; optimization and updates; and transactions and multimedia.
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Additional info for Advances in Web-Age Information Management: Third International Conference, WAIM 2002 Beijing, China, August 11–13, 2002 Proceedings
XML is merging as the main standard of presentation and exchange on the Internet. Various XML query languages are proposed. As a ubiquitous part of those XML query languages, path expression poses a new challenge for efficient XML query processing in database systems. In this paper, we present a new index structure, Structural Map, for efficient evaluation of path expression queries. Structural Map can be used to support path-indices as well as valueindices in an integrated manner. It is powerful to handle not only simple path expressions but also the branching path expressions and path expressions with predicates efficiently.
Each line segment may start at any possible position of the first point and end at any possible position of the second point. The probability of each of these potential line segments is the product of the probabilities of the two points being at those precise locations. 3 Basis for the New Model As mentioned in Section 2, there are two basic modelling techniques for creating a discrete model: raster and vector. The vector approach is chosen in this paper because rasters require much more storage space for regions, and lines may become inaccurate when stored in a raster format.
Lv et al. Step 1. Reduction of ”//” and ” ∗ ”. In this step, operators ”//” and ” ∗ ” are attempted to be substituted by equivalent paths with the knowledge of DTD or schema information. Step 2. Normalization of predicates. g. Main Disjunctive Form, in order to select proper indexes. Step 3. Complementary path selection. Refer to the DTD, the complementary paths of normalized user query are found and their costs are estimated. Check if the cost of complementing approach is lower than that of the original path, if does, the complementary approach is prefer, or else the original path is chosen.