Read e-book online An Introduction to XML Query Processing and Keyword Search PDF

By Jiaheng Lu

"An advent to XML question Processing and key-phrase seek" systematically and comprehensively covers the newest advances in XML information looking out. It offers an intensive evaluation of the present question processing and key-phrase seek innovations on XML facts, 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 facts looking will locate this ebook a useful source. Prof. Jiaheng Lu is an affiliate professor at Renmin collage of China’s tuition of Information.

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Extra info for An Introduction to XML Query Processing and Keyword Search

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End V-CDBS-SubEncoding is a recursive procedure, the input of which is an array codeArr, the left position “PL ” and the right position “PR ” in array codeArr. 1), then it uses the new left and right positions to call the V-CDBS-SubEncoding procedure itself, until each (except 0) element of the array codeArr has a value. 2 can encode all the numbers from 1 to TN with V-CDBS codes. Proof The V-CDBS encoding is like the binary search. As we know, the binary search will not miss any values in the search.

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. V-CDBS-SubEncoding(codeArr, PL , PM ); 5. V-CDBS-SubEncoding(coderArr, PM , PR ); 6. end V-CDBS-SubEncoding is a recursive procedure, the input of which is an array codeArr, the left position “PL ” and the right position “PR ” in array codeArr.

1). Since 18 needs 5 bits to store, zero or more “0”s should be concatenated before each code of V-Binary. 1). Because F-CDBS is that some “0”s are concatenated after the V-CDBS codes, we focus on V-CDBS to introduce the algorithm. 2 is the V-CDBS encoding algorithm. We use the procedure V-CDBSSubEncoding to get all the codes of the numbers. Finally number 0 and number (TN C 1) should be discarded since they do not exist actually. 2: V-CDBS Encoding (TN) Input: A positive integer TN Output: The V-CDBS codes for numbers 1 to TN 1.

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