Lecture notes in computer science on Advances in object-oriented database systems
Lecture notes in computer science on Advances in object-oriented database systems
The entity-relationship model—toward a unified view of data
ACM Transactions on Database Systems (TODS) - Special issue: papers from the international conference on very large data bases: September 22–24, 1975, Framingham, MA
A Graphical Query Facility for ER Databases
Proceedings of the Fourth International Conference on Entity-Relationship Approach
Entity-Relationship Database User Interfaces
Proceedings of the Sixth International Conference on Entity-Relationship Approach
OOER: Toward Making the E-R Approach Object-Oriented
Proceedings of the Seventh International Conference on Enity-Relationship Approach: A Bridge to the User
Query by Diagramm: A Graphic Query System
Proceedings of the Seventh International Conference on Enity-Relationship Approach: A Bridge to the User
The model-assisted global query system for multiple databases in distributed enterprises
ACM Transactions on Information Systems (TOIS)
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In this paper we present the iconic query system of the KIM environment, providing the user with a homogeneous access to distributed, heterogeneous and multimedia databases through a modality independent of the specific underlying environments (i.e. DBMS and physical installations).A prototype of this system is being designed and implemented by a European Consortium under the KIM project, within the European ESPRIT programme. The characteristics of the query system have been identified on the basis of several research contributions, integrated and refined with the actual discussion and validation with a significant number of users in real working environments. Now, a significant nucleus of the prototype is operating and is being experimented with real databases at several pilot sites in Europe, and mainly at the European Space Agency in Frascati (Italy).The basic assumption underlying the KIM approach, is that conceptual (graphical) models can represent a suitable and integrated method to permit the user to access information from distributed, heterogeneous databases without needing to know the actual organisation, models and physical products.Different requirements and classes of users can be envisaged for a generic query system. An analysis of these categories is provided, discussing the most effective interfacing modalities for the individual cases.On the basis of the depicted considerations, the system provides both iconic and diagrammatic interfaces. The adoption of mixed interface (including both icons and ER diagrams) is quite innovative in this field, both as concerns the research activities and its actual implementation in industrial environments.