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Operators in an extended entity-relationship model and their applications

In this paper, a way of extending the EER model is described. This new extension would be able to represent other functions that previously could not be specified using the ER diagram. It would also allow a user to incorporate previous ER diagrams into any diagram being used. This new extension is called an operator. In this paper, operators will be described more in depth and examples will be given by using a company database.