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Class Diagram Question

Hi guys,
I am in the process of constructing a Class diagram for an appointment system.
My question is that when objects are generalized is it compulsory to place attributes and operations for each generalization tree?

Please see the image I have uploaded.
The Nurse, Admin staff, and Doctor are generalization of the Employee. However there are no attributes or operations mentioned in their boxes. Is this normal - or do you have to list additional attributes and operations?

Advice will be much appreciated guys, :)
Kind regards,
Attached Images
File Type: jpg Class Diagram.jpg (68.0 KB, 3686 views)
Nov 10 '11 #1
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