Web Information Systems Engineering – WISE 2007: 8th by Junhu Wang, Jeffrey Xu Yu, Chengfei Liu (auth.), Boualem

By Junhu Wang, Jeffrey Xu Yu, Chengfei Liu (auth.), Boualem Benatallah, Fabio Casati, Dimitrios Georgakopoulos, Claudio Bartolini, Wasim Sadiq, Claude Godart (eds.)

This booklet constitutes the court cases of the eighth foreign convention on net info platforms Engineering, clever 2007, held in Nancy, France, in December 2007.

The forty revised complete papers and 18 revised brief papers awarded have been rigorously reviewed and chosen from approximately two hundred submissions. The papers are prepared in topical sections on querying, belief, caching and distribution, interfaces, occasions and knowledge filtering, information extraction, transformation, and matching, ontologies, rewriting, routing, and personalisation, brokers and mining, QOS and administration, modeling, and topics.

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Additional resources for Web Information Systems Engineering – WISE 2007: 8th International Conference on Web Information Systems Engineering Nancy, France, December 3-7, 2007 Proceedings

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2. A query is valid if at least one of its query instances is accepted by the query interface, regardless of whether or not any records are returned. That a query instance is accepted means that it is executed by the underlying database system. When a query instance is rejected by the query interface, an error message will be returned usually. , constraint All/Any depends on attribute Keyword in Fig. 2. We name this dependency as conditional dependency. It is a restriction between a non-functional attribute and a constraint.

A fraction of the Web and a bounding condition containing the maximal information load the user is willing to accept. Furthermore a user may specify a trigger condition which determines the points in time when the query is executed and a freshness value which indicates the maximal B. Benatallah et al. ): WISE 2007, LNCS 4831, pp. 26–37, 2007. c Springer-Verlag Berlin Heidelberg 2007 Optimization of Bounded Continuous Search Queries Based on Ranking Distributions 27 period of time a user is willing to accept between the detection of a relevant information object on the Web and the time of a respective notification message.

XN , the threshold S should fulfill the equation E(|{i with xi > S}|) = k. Based on this equation we can reformulate: N E(|{i with xi > S}|) = k ⇔ E( i=1 equal dist. ⇐⇒ N 1{xi >S} ) = k ⇔ E(1{xi >S} ) = k (2) i=1 N ∗ E(1{x>S} ) = k ⇔ N ∗ P (x > S) = k ⇔ P (x > S) = k N (3) Here x is an arbitrary ranking score at an arbitrary point of time, where the point of appearance of each ranking score has equal likelihood. The characteristic function 1C (x) based on a condition ’C’ is defined to be 1 if the condition is true and 0 otherwise.

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