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Each entity is described by a set of attributes. E.g. Employee = (Name, Address, Age, Salary).
Each attribute has a name, associated with an entity and is associated with a domain of legal values. However the information about attribute domain is not presented on the ER diagram.
In the diagram, each attribute is represented by an oval with a name inside.
Figure 8.2 Source: http://cnx.org/content/m28250/latest/
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