Download Current Trends in Database Technology - EDBT 2004 Workshops: by Lukasz Golab (auth.), Wolfgang Lindner, Marco Mesiti, Can PDF

By Lukasz Golab (auth.), Wolfgang Lindner, Marco Mesiti, Can Türker, Yannis Tzitzikas, Athena I. Vakali (eds.)

This quantity contains papers from the subsequent ?ve workshops that have been a part of the total application for the overseas convention on Extending Database know-how (EDBT) held in Heraklion, Greece, March 2004: • ICDE/EDBT Joint Ph. D. Workshop (PhD) • Database applied sciences for dealing with XML-information on the net (DataX) • Pervasive info administration (PIM) • Peer-to-Peer Computing and Databases (P2P&DB) • Clustering info Over the net (ClustWeb) jointly, the ?ve workshops featured sixty one high quality papers chosen from appr- imately a hundred and eighty submissions. It used to be, hence, dif?cult to settle on the papers that have been to beacceptedforpresentation. Webelievethattheacceptedpaperssubstantiallycontribute to their specific ?elds of analysis. The workshops have been an outstanding foundation for extreme and hugely fruitful discussions. the standard and volume of papers convey that the components of curiosity for the workshops are hugely energetic. a great number of first-class researchers are engaged on the aforementioned ?elds generating study output that isn't purely of curiosity for different researchers but additionally for undefined. The organizers and members of the workshops have been hugely satis?ed with the output. The prime quality of the presenters and workshop contributors contributed to the good fortune of every workshop. the fantastic atmosphere of Heraklion and the positioning of the EDBT convention additionally contributed to the final luck. final, yet now not least, our honest because of the convention organizers – the organizing staff was once consistently keen to aid and if there have been issues that didn't paintings, guidance was once quick available.

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Additional resources for Current Trends in Database Technology - EDBT 2004 Workshops: EDBT 2004 Workshops PhD, DataX, PIM, P2P&DB, and ClustWeb, Heraklion, Crete, Greece, March 14-18, 2004. Revised Selected Papers

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Hence, one has to map similarity queries to substring queries. The filtering technique is one well-known approach to do this mapping. Assuming errors are allowed between two strings, one can decompose the comparison string substrings. The union of the results of these substring queries contains all matching strings. To minimize the size of this preselection result, the most selective combination of substring queries has to be found. Therefore, one has to maintain frequency information on global level to make selectivity estimations.

Concept-based Querying in Mediator Systems. The VLDB Journal, 2004. To appear. 24. S. Sizov, M. Theobald, S. Siersdorfer, G. Weikum, J. Graupmann, M. Biwer, and P. Zimmer. The BINGO! System for Information Portal Generation and Expert Web Search. In CIDR 2003, 2003. 25. A. Theobald and G. Weikum. The Index-Based XXL Search Engine for Querying XML Data with Relevance Ranking. In EDBT 2002, pages 477–495, 2002. 26. G. Wiederhold. Mediators in the Architecture of Future Information Systems. IEEE Computer, 25(3):38–49, 1992.

Geist Fig. 1. Keyword query processing with C all concepts existent in the schema and getQExpr(C, KW) a function returning a set of query expression of the form which are explained below. The operation is the outer union operation. Index-Based Keyword Query Processing. A general keyword query without structural information is processed in two steps: (i) reformulating the unstructured keyword query in structured global algebra expression, and (ii) decomposing these expressions into source queries, which are sent to the sources.

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