Download PDF by Serge Abiteboul, Neoklis Polyzotis (auth.), Yannis: Advances in Databases and Information Systems: 10th East

By Serge Abiteboul, Neoklis Polyzotis (auth.), Yannis Manolopoulos, Jaroslav Pokorný, Timos K. Sellis (eds.)

This e-book constitutes the refereed court cases of the tenth East eu convention on Advances in Databases and data structures, ADBIS 2006, held in Thessaloniki, Greece, in September 2006.

The 29 top of the range papers have been chosen in a rigorous reviewing method out of 126 submissions. The papers deal with a variety of sizzling study matters and are geared up in topical sections on: XML databases and semantic internet, materialized perspectives, database modelling, net info structures and middleware, question processing and indexing, information mining and clustering, and modelling and layout issues.

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Extra info for Advances in Databases and Information Systems: 10th East European Conference, ADBIS 2006, Thessaloniki, Greece, September 3-7, 2006. Proceedings

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9 presents the result of NR/NQ. Fig. 10 and Fig. xsd, and the evaluation time of the according refined query R5 on different documents when using the Qizx evaluator and when using the Saxon evaluator respectively. Note that other refined queries have comparable results. The results show that the refined query selects a smaller set of nodes in most cases so that we can save processing and transportation costs. Although the time of rewriting is more than the time of query processing, when the size of the queried data is small, the absolute overhead of the rewriting approach is quite low, less than 1 second in all considered cases.

A loop might occur when an XPath query contains the axis desc, ances, preceding or following, which are boiled down to the recursive evaluation of the axis child or parent respectively. For computing L⎡desc::n⎦(p), we first compute pi | pi∈L⎡child::*⎦(pi-1) where p1=L⎡child::*⎦(p). e. XP’, L’⎡self::n⎦(pi) is then computed in order to construct a possible new path from pi. e. e. {pi(k), …, pi(S-1)} is identified. e. ,p(S-1))), and returns true. e. z. e. z), and returns true. The schema paths of a qualifier are attached to the context node of the qualifier.

Therefore, we propose a schema-based approach to the satisfiability test and to the refinement of users’ XPath queries. Our schema-based approach checks whether or not an XPath query conforms to the constraints given in the schema, rewrites and refines the XPath query according to the information of the schema. If an XPath query does not conform to the constraints given in the schema, its results will be every time an empty node set, which is a hint for semantic errors in the XPath query. Our rewriting approach for XPath queries replaces wildcards with specific node tests, replaces recursive axes with non-recursive axes, eliminates reverse axes, and redundant location steps.

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