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

By Jiaheng Lu

"An creation to XML question Processing and key-phrase seek" systematically and comprehensively covers the most recent advances in XML info looking. It offers an intensive assessment of the present question processing and key-phrase seek thoughts on XML info, 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 out will locate this ebook a useful source. Prof. Jiaheng Lu is an affiliate professor at Renmin college of China’s tuition of Information.

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2, the V-CDBS codes will be “001”, “01”, “1”, and “11”. Similarly if there are two siblings, their self-labels are “01” and “1”. 8 shows V-CDBS-Prefix. Similarly we can apply V-CDBS to the prime labeling scheme to record the document order. , relationships, its query efficiency is quite bad. Therefore, we do not discuss in detail how V-CDBS is applied to prime. 6 CDQS Encoding The size of each V-CDBS code is stored with fixed length. If many nodes are inserted into the XML tree, the size of the length field is not enough for the new labels; then we have to relabel all the existing nodes.

The CDQS is the only technique which can completely avoid relabeling in XML leaf node updates. In addition, none of the existing techniques can efficiently process internal node updates; therefore, we also propose techniques to much more efficiently process internal node updates though we cannot completely avoid relabeling in internal node updates. 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.

1 shows the binary number encoding (V-Binary and F-Binary) and CDBS (V-CDBS and F-CDBS) encoding of 18 numbers. We choose 18 as an example, in fact, CDBS can encode any number. 1 which have variable lengths, called V-Binary. The following steps show the details of how to encode the 18 decimal numbers based on CDBS encoding (binary string). 1 shows CDBS, which is called V-CDBS because it is also encoded with variable lengths. Step 1: In the encoding of the 18 numbers, we suppose there is one more number before number 1, say number 0, and one more number after number 18, say number 19.

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