Download Advances in Conceptual Modeling: ER’ 99 Workshops on by F. Estrella, Z. Kovacs, J -M. Le Goff, R. McClatchey, M. PDF

By F. Estrella, Z. Kovacs, J -M. Le Goff, R. McClatchey, M. Zsenei (auth.), Peter P. Chen, David W. Embley, Jacques Kouloumdjian, Stephen W. Liddle, John F. Roddick (eds.)

The aim of the workshops linked to the ER'99 18th foreign convention on Conceptual Modeling is to offer individuals entry to excessive point displays on really good, scorching, or rising medical subject matters. 3 topics were chosen during this recognize: — Evolution and alter in info administration (ECDM'99) facing han­ dling the evolution of information and information constitution, — opposite Engineering in details structures (REIS'99) aimed toward exploring the problems raised by way of legacy structures, — the area vast internet and Conceptual Modehng (WWWCM'99) which ana­ lyzes the mutual contribution of WWW assets and strategies with con­ ceptual modeling. ER'99 has been equipped in order that there is not any overlap among convention ses­ sions and the workshops. accordingly individuals can stick to either the convention and the workshop shows they're attracted to. i want to thank the ER'99 application co-chairs, Jacky Akoka and Mokrane Bouzeghoub for having given me the chance to arrange those workshops. i'd additionally prefer to thank Stephen Liddle for his worthwhile assist in dealing with the overview technique for submitted papers and supporting to arrange the workshop lawsuits for book. August 1999 Jacques Kouloumdjian Preface for ECDM'99 the 1st a part of this quantity comprises the court cases of the 1st overseas Workshop on Evolution and alter in info administration, ECDM'99, which was once held along with the 18th overseas convention on Conceptual Modehng (ER'99) in Paris, France, November 15-18, 1999.

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Read or Download Advances in Conceptual Modeling: ER’ 99 Workshops on Evolution and Change in Data Management, Reverse Engineering in Information Systems, and the World Wide Web and Conceptual Modeling Paris, France, November 15–18, 1999 Proceedings PDF

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Extra resources for Advances in Conceptual Modeling: ER’ 99 Workshops on Evolution and Change in Data Management, Reverse Engineering in Information Systems, and the World Wide Web and Conceptual Modeling Paris, France, November 15–18, 1999 Proceedings

Sample text

In the sequel, the temporal domain of a property instance's effective history is called its effective temporal domain, or effective domain in short. g. 0 for integers, nil for objects) or to some padding value provided by the user. g. all weekdays). g. due to a strike), so that the effective history is undefined for those days. g. a property instance modeling an employee's salary). g. if the smallest instant in the effective domain is different from the smallest instant in the observation domain).

Dn, dn+i: Iqd"+Hu^"( -.. u f ( u f (db))))]M = [q<'"+Hur( . . u f ( u f (db))))]M' D Notice that in this latter expression, updates and queries are parameterized by an instant. This is because, in some temporal data models, the semantics of queries and updates depend on the instant at which they are issued. In the setting of ODMG, the set of queries Q not only includes those which are submitted to the OQL interpreter, but also, all accesses to class extents and object properties via application programs.

Mannisto, R. Sulonen The concepts are roughly illustrated in Fig. 2, in which generic objects are represented by ovals. Inside an oval are the versions of the generic object as small circles, each with an effectivity interval next to it. Solid-line arrows represent is-instance-of relations and dottcd-linc arrows relations in schema and between individuals. The concepts provide the basics for recording the history of objects. The concepts can be used in various ways, and therefore, the modelling of evolution is far from solved by just providing the basic concepts.

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