Abstract
Today traditional information systems and deductive systems are modeled and implemented separately. Most users, however, demand integrated systems which meet their everyday information needs and have deductive capabilities as well. The well-known Entity-Relationship approach to conceptual data modeling is extended to cover modeling of such systems. First, a descriptive query language is introduced as a basis. Then it is shown how this language may be used to define derivable schema components. Finally, a classification of derivable data is given which allows the analyst to decide which derivable data should be included in the conceptual schema.
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