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 overseas convention on Conceptual Modeling is to provide contributors entry to excessive point displays on really expert, scorching, or rising medical subject matters. 3 issues were chosen during this admire: — Evolution and alter in info administration (ECDM'99) facing han dling the evolution of information and knowledge constitution, — opposite Engineering in details structures (REIS'99) geared toward exploring the problems raised by means of legacy platforms, — the area huge net and Conceptual Modehng (WWWCM'99) which ana lyzes the mutual contribution of WWW assets and methods with con ceptual modeling. ER'99 has been prepared in order that there isn't any overlap among convention ses sions and the workshops. hence contributors can persist with either the convention and the workshop displays 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 prepare those workshops. i might additionally wish to thank Stephen Liddle for his worthwhile assist in coping with the review technique for submitted papers and supporting to arrange the workshop complaints for book. August 1999 Jacques Kouloumdjian Preface for ECDM'99 the 1st a part of this quantity comprises the lawsuits of the 1st overseas Workshop on Evolution and alter in info administration, ECDM'99, which was once held at the side of the 18th overseas convention on Conceptual Modehng (ER'99) in Paris, France, November 15-18, 1999.
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Additional 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
To this end, two versioning modalities will be considered in a single powerful system: temporal versioning and management of alternative design versions. As fax as the temporal components are concerned, the proposed extensions of ODL and OQL will be consistent with the TSQL2 temporal query language. 1 Introduction Databases and software systems have complex structures which are likely t o continually undergo changes during their lifetime. e. schema) is subject to change. T h e need for retaining d a t a entered under any schema definition has led t o t h e introduction of the schema version notion.
Value operator. In the temporal mode, get-history and set-ehistory are used instead. In fact, the notion of access mode simulates a view mechanism: applications using the snapshot mode access a "snapshot" view of the database, while those using the temporal mode access the "temporal" view. Different access modes may be attached to any two applications accessing the same database. As a result, the access mode is a parameter of each application session. The snapshot mode is the default. This design choice is crucial 34 M.
D Hence, a database instance is seen as an abstract entity, to which it is possible to apply updates (statements whose evaluation map a database instance into another one), and queries (statements whose evaluation over a database yield an instance of some data structure). We successively introduce two levels of migration requirements: upward compatibility and temporal transition support. The definitions that we provide may be seen as adaptations to the object-oriented framework, of the notions of upward compatibility and temporal upward compatibility introduced in [1,12].
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 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.)