Abstract
The main goal of our efforts is the specification of data bases whose structure and behaviour are restricted by semantic integrity constraints. Research proceeds along the following stages: 1. Choose a data model; 2. Establish a taxonomy of integrity constraints; 3. Specify the data model formally; 4. Develop a methodology for specifying conceptual schemas for different applications, based on the data model; 5. Provide a conceptual characterization of query and update operations.
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