Database and Expert Systems Applications: 10th International by Georg Gottlob, Nicola Leone, Francesco Scarcello (auth.), PDF

By Georg Gottlob, Nicola Leone, Francesco Scarcello (auth.), Trevor J.M. Bench-Capon, Giovanni Soda, A Min Tjoa (eds.)

ISBN-10: 3540664483

ISBN-13: 9783540664482

The Database and professional platforms purposes (DEXA) meetings compile researchers and practitioners from around the globe to replace principles, stories and critiques in a pleasant and stimulating setting. The papers are right away a list of what has been completed and the 1st steps in the direction of shaping the way forward for details structures. DEXA covers a large box, and all features of database, wisdom base and comparable applied sciences and their functions are represented. once more there have been loads of submissions: 241 papers have been submitted and of those the programme committee chosen 103 to be offered. DEXA’99 came about in Florence and was once the 10th convention within the sequence, following occasions in Vienna, Berlin, Valencia, Prague, Athens, London, Zurich, Toulouse and Vienna. the last decade has noticeable many advancements within the components lined by means of DEXA, advancements during which DEXA has performed its half. i need to precise because of the entire associations that have actively supported and made attainable this convention, particularly: • college of Florence, Italy • IDG CNR, Italy • FAW – college of Linz, Austria • Austrian desktop Society • DEXA organization furthermore, we needs to thank the entire those that have contributed their effort and time to make the convention attainable. exact thank you visit Maria Schweikert (Technical college of Vienna), M. Neubauer and G. Wagner (FAW, collage of Linz). We should also thank the entire participants of the programme committee, whose cautious stories are very important to the standard of the conference.

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Extra resources for Database and Expert Systems Applications: 10th International Conference, DEXA’99 Florence, Italy, August 30 – September 3, 1999 Proceedings

Example text

Meta-classes in SADES and the relationships their instances participate in Fig. 7 shows the relationship classes in the meta-model corresponding to the classes in the relationship model presented in fig. 4. Note that ordering semantics for relationships can be provided by using an ordered collection, such as a list or an array, for participants. Almost all object database management systems offer facilities to create ordered collections and provide methods such as addAsFirst, addAsLast, addAtSpecifiedPosition, etc.

Also, it makes maintenance a problem because it is easy to make errors. In contrast to ODMG which mandates binary relationships among the various objects and meta-objects in the system, the Iris object oriented database management system [8] uses n-ary, inverse traversable relationships to model information about objects and meta-objects residing in the database. Referential integrity is maintained by the DBMS. In contrast to the ODMG compliant systems discussed earlier, both objects and metaobjects in Iris are semantically related.

Necessary attributes (existing and new) are specified within the new abstraction. The methods, which call upon these attributes, are integrated and proposed to the user for validation. The user will validate and complete the specifications of the abstraction. O1’s Temporary Scheme is thus a simple emergent object. Now, the question is where this new abstraction must be inserted? There are two possibilities: − Within the hierarchy branch of Researcher, as a sub-class of Senior-Researcher, with a mutation on the Module gene defined by Teacher.

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Database and Expert Systems Applications: 10th International Conference, DEXA’99 Florence, Italy, August 30 – September 3, 1999 Proceedings by Georg Gottlob, Nicola Leone, Francesco Scarcello (auth.), Trevor J.M. Bench-Capon, Giovanni Soda, A Min Tjoa (eds.)


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