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 facts looking. It provides an intensive evaluate 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 institution of Information.

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To solve the overflow problem, we observed that the size of V-CDBS is used only to separate different V-CDBS codes. After separation, we can directly compare the V-CDBS codes from left to right. Therefore, to solve the overflow problem, the way is to find a separator which can separate different V-CDBS codes; meanwhile this separator will not encounter the overflow problem. In binary string, there are only two symbols “0” and “1”; if we use “0” or “1” as the separator, only one symbol is left and CDBS will not be dynamic.

We also pointed out the limitations of existing labeling schemes for XML data assuming documents are frequently updated. At last, we introduce a compact dynamic binary string (CDBS) encoding, proposed in [LLH08], which is orthogonal to specific labeling schemes; therefore, it can be applied broadly to different labeling schemes, for example, containment, prefix, and prime schemes, to maintain the document order when XML is updated. : Efficient management of transitive relationships in large data and knowledge bases.

Given a label path l of s, let Ts (l) be the target set of l in s, and let Td (l) be the (singleton) target set of l in d. Let Ls (l) D fm j Ts (m) D Ts (l)g. That is, Ls (l) is the set of all label paths in s that share the same target set as l. Similarly, let Ld (l) D fm j Td (m) D Td (l)g. That is, Ld (l) is the set of all label paths in d that share the same target set as l. If, for all label paths l of s, Ls (l) D Ld (l), then d is a strong DataGuides for s. 1 Suppose d is a strong DataGuides for a source s.

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