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

By Jiaheng Lu

"An creation to XML question Processing and key-phrase seek" systematically and comprehensively covers the newest advances in XML info looking. It provides an in depth assessment of the present question processing and key-phrase seek suggestions 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 will locate this e-book a useful source. Prof. Jiaheng Lu is an affiliate professor at Renmin collage of China’s tuition of Information.

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

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We firstly use an example to illustrate how CDBS encodes a set of numbers. 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.

1: AssignMiddleBinaryString(SL, SR) Input: SL < SM < SR, SL and SR, which are both ended with “1” and SL < SR Output: SM (ended with 1) such that SL < SM < SR lexicographically 1. if size(SL ) size(SR ) then 2. SM D SL ˇ “1”; // case (a), ˇ means concatenation 3. else SM D SR with the last bit “1” changed to “01”; // case (b) 4. end 5. 1 is required to be 1. 6, we show why we require the last bit of the binary string to be “1”. 7 Suppose there are two binary strings “0” and “00”, “0” < “00” lexicographically because “0” is a prefix of “00”, but we cannot insert a binary string SM between “0” and “00” such that “0” < SM < “00”.

3 for the insertions. 6 CDQS can completely avoid relabeling in XML leaf node updates. Proof We use “0” as the separator to separate different CDQS codes, and “0” will never encounter the overflow problem. 2 guarantees that infinite number of quaternary strings can be inserted between any two consecutive CDQS codes. The existing labeling schemes cannot completely avoid the relabeling in internal node updates; this is the drawback of the existing labeling schemes. 3”). 2” in Fig. 9 (except the root which is empty) in the hard disk, they are stored as “120020020200”.

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