By Jiaheng Lu
"An advent to XML question Processing and key-phrase seek" systematically and comprehensively covers the newest advances in XML info looking out. It provides an in depth evaluate 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 information looking will locate this ebook a useful source. Prof. Jiaheng Lu is an affiliate professor at Renmin collage of China’s university of Information.
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Extra resources for An Introduction to XML Query Processing and Keyword Search
Restaurant) x1 P x2 Name x3 F x4 . Restaurant) x1 (" j ) x2 Name x3 Fridays x4 40 3 XML Data Indexing Given a path template t, our goal is to construct an index structure that will enable an efficient evaluation of queries in inst(t). The templates are used to guide the indexing mechanism to concentrate on the more interesting parts of the data graph. For example, if we know that the database contains a restaurants directory and that most common queries refer to the restaurant and its name, we may use a path template such as the one above.
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. If an annotation p of some label path l is stored on the object o reachable via l in d, then p describes the target set in s of each label path that reaches o. Proof Suppose otherwise. Then there exists some label path m that reaches o, such that p incorrectly describes the target set of m in s.
This also results in inefficient query evaluation, since we have to intersect W(P) with each regular language. 2 Indexes on XML Tree Structure 41 Fig. 3 Refinements To tackle the construction cost, we consider refinements. An equivalence relation is called a refinement if: v u)vÁu We discuss here two choices for refinements: bisimulation b and simulation Both are discussed extensively in the literature [HHK95, Mil89, PT87]. The idea that these can be used to approximate the language equivalence dates back to the modeling of reactive systems and process algebras [HHK95].