By Jiaheng Lu
"An advent to XML question Processing and key-phrase seek" systematically and comprehensively covers the most recent advances in XML info looking. It provides an in depth evaluation of the present question processing and key-phrase seek concepts 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 facts looking will locate this publication a useful source. Prof. Jiaheng Lu is an affiliate professor at Renmin college of China’s tuition of Information.
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Extra resources for An Introduction to XML Query Processing and Keyword Search
We show that F is one-to-one using the same notation and a symmetrical argument. If F(t) D F(u), by construction we know that Td (l) D Td (m). l and m are therefore both elements of Ld (l) and by definition of a strong DataGuides are also elements of Ls (l). Therefore, Ts (l) D Ts (m), that is, t D u. 38 3 XML Data Indexing 3. Finally, we see that the accuracy constraint of any DataGuides guarantees that F is onto. Any object in d must be reachable by some label path l that also exists (and therefore has a target set) in s.
As another example, assume we know nothing about the database, but users never ask for more than k objects on a path. Then we may take t D P x1 P x2 : : : P xk and build the corresponding index. 2 Naive Index Our goal here is to compute efficiently queries q 2 inst( P x). DB/ D wjw D a1 ; : : : ; an ; 9 a path v0 ! o ! v; with v0 a root node an Next, define the language equivalence relation, v Á u on nodes in DB to be v Á u , Lv D Lu We denote with [v] the equivalence class of v. Clearly, there are no more equivalence classes than nodes in DB.
Even if using values with large gaps, it still cannot avoid relabeling due to the float-point precision. Therefore, using real values instead of integers only provides limited benefits for the label updating. 2 Prefix-Based Dynamic Labeling Scheme Compared with region-based labeling scheme, prefix-based labeling scheme is more robust for insertion. However, relabeling still cannot be avoided for insertions between two consecutive siblings. OrdPath [OOPC04] is a prefix labeling scheme which uses a clever “caretingin” scheme to support insertions.
An Introduction to XML Query Processing and Keyword Search by Jiaheng Lu