T3. Apply the Abstraction-Occurrence pattern in the following situations. For each situation, show the two linked classes, the association between the classes, and the attributes in each class. (a) The issues of a periodical. (b) Models of electronic appliances and the individual appliances.

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Enhanced ER Model

The enhanced ER model is an abbreviation for Enhanced Entity-Relationship (EER) model. As you know, the entity-relationship (ER) model is a pictorial illustration of the relationship between various entities of a domain. In the case of a large amount of data with multiple interrelated entities, the ER diagrams become complex and tough to interpret. For such cases, the need for enhancement in the ER model was observed, and thus, the EER model was designed.