An active database is a database in which some operations are automatically executed when specified events happen and particular conditions are met. Several systems which support active rules in an object-oriented data model have been proposed. However, many issues related to the integration of trieggers with object-oriented modeling concepts have been devoted so far limited attention and still need investigation. In this paper, we discuss the problems related to trigger inheritance and refinement in the context of the CHimera active object-oriented data model.
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