By Rudolf Bayer (auth.), Heinrich C. Mayr, Jiri Lazansky, Gerald Quirchmayr, Pavel Vogel (eds.)
th DEXA 2001, the 12 foreign convention on Database and professional platforms functions used to be hung on September 3–5, 2001, on the Technical college of Munich, Germany. The quickly turning out to be spectrum of database purposes has ended in the institution of extra really expert dialogue structures (DaWaK convention, EC net convention, and DEXA workshop), that have been all held in parallel with the DEXA convention in Munich. on your palms are the result of a lot attempt, starting with the practise of the submitted papers. The papers then undergone the reviewing method, and the accredited papers have been revised to ultimate models by way of their authors and organized with the convention application. All this culminated within the convention itself. a complete of one hundred seventy five papers have been submitted to this convention, and that i want to thank the entire authors. they're the true base of the convention. this system committee and the aiding reviewers produced altogether 497 referee studies, on commonplace of 2.84 stories according to paper, and chosen ninety three papers for presentation. evaluating the burden or extra exactly the variety of papers dedicated to specific issues at a number of fresh DEXA meetings, a rise should be well-known within the components of XMS databases, lively databases, and multi and hypermedia efforts. the distance dedicated to the extra classical themes akin to info retrieval, distribution and internet facets, and transaction, indexing and question facets has remained kind of unchanged. a few reduce is noticeable for item orientation.
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Additional info for Database and Expert Systems Applications: 12th International Conference, DEXA 2001 Munich, Germany, September 3–5, 2001 Proceedings
E. users might want to know if the value of a given stock has increased by more than 10%. Several tests on stock exchange and auction web pages proved the eﬀectiveness of the proposed approach. 1 Introduction Due to increasing number of people that use the Web for shopping or on-line trading, services for searching information and identifying changes on the Web have received renewed attention from both industry and research community. Indeed, users of e-commerce or on-line trading sites frequently need to keep track of page changes, since they want to access pages only when their information has been updated.
The general problem of ﬁnding a minimum cost edit script that transforms a document into its modiﬁed version is computationally expensive (NP-hard) [3,2]. However, in many application contexts, like the one considered in the above example, users are only interested in the changes made and not in the sequence of updates which produce the new document. For the on-line trading example, users are interested in the change on the quotation of a stock or in the insertion of a new stock, regardless of the changes in the whole structure or the intermediate changes.
This association is captured in SCT where Enrol is viewed as an entity type participating in other relationship sets. The ER diagram is also in normal form. 3 ER to S3-Graph Translation The task of designing a “good” semistructured database can be made easier if we have more semantics. For example,  proposes a normal form for the ER model and uses the normal form ER to design normal form nested relations. This top-down approach has two advantages. First, normalizing an ER diagram removes ambiguities, anomalies and redundancies at the semantic level.