Get An Introduction to XML Query Processing and Keyword Search PDF

By Jiaheng Lu

ISBN-10: 3642345549

ISBN-13: 9783642345548

ISBN-10: 3642345557

ISBN-13: 9783642345555

"An advent to XML question Processing and key-phrase seek" systematically and comprehensively covers the most recent advances in XML facts looking out. It offers an intensive review of the present question processing and key-phrase seek suggestions on XML information, together with XML labeling schemes, indexing, processing on order and un-order XML tree styles, XML question optimization, effects estimation, and XML key-phrase searches, that are elaborated in separate chapters. Graduate scholars and researchers within the box of XML info looking will locate this publication a useful source. Prof. Jiaheng Lu is an affiliate professor at Renmin collage of China’s university of Information.

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Additional resources for An Introduction to XML Query Processing and Keyword Search

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Suppose there is one more number before the first number, called number 0, and one more number after the last number, called number (TN C 1); 2. Define an array codeArr[0, TN C 1] // the size of codeArr is TNC2; // each element of the codeArr is empty at beginning; 3. V-CDBS-SubEncoding (codeArr, 0, TN C 1); 4. Discard the 0th and (TN C 1)-th elements of codeArr; Procedure V-CDBS-SubEncoding (codeArr, PL , PR ) 1. PM D round((PL C PR ) / 2)((PL C PR ) / 2); 2. if PL C 1 < PR then 3. codeArr[PM] D assignMiddleBinaryString(codeArr[PL], codeArr[PR]); 4.

1 Region-Based Dynamic Labeling Scheme It should be noted that relabeling in the region encoding scheme is not only to maintain the document order. , relationships. 18 2 XML Labeling Scheme Fig. 6 OrdPath prefix scheme The approach the region encoding scheme used to maintain the document order is to leave gaps between adjacent labels in advance. Whenever the gaps are filled, that is, the values left in advanced are used up, the labeling schemes have to relabel. But obviously the update cost of this approach is expensive, especially when updates frequently happen.

4 The Encoding Schemes The main idea of most labeling schemes is to leave some unused values for future insertions. When the unused values are used up later, they have to relabel the existing nodes, that is, they cannot completely avoid relabeling in XML leaf node updates. Although prime supports order-sensitive updates without relabeling the existing nodes, it needs to recalculate the SC values based on the new ordering of nodes. 4 Dynamic Labeling Scheme 21 recalculation is much more time consuming.

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An Introduction to XML Query Processing and Keyword Search by Jiaheng Lu

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