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+The third type of relationship that we saw, is
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+Generalization. Generalization is a relationship, between a general class,
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+which we normally call super-class and the more specific
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+class, a class the refines the super-class and that
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+we normally call sub-class. It's also known as a
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+kind of or is a relationship because we can
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+say that the subclass is a super class and
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+it's expressed with a solid line with a big arrow
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+head at the end. So let's see an example of
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+that. In this case I'm going to indicate. Two of this kind
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+of relationships. The first one involving the RegistrationUser and
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+a student. And the second one, a RegistrationUser and the
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+professor. So, basically what we're showing here is a
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+typical case in which the registration user is a more general
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+concept then the Student and the Professor. So both the student
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+and the professor are RegistrationUsers. So there is a relationship,
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+the Professor is a registration user and the Student is a RegistrationUser.
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+And therefore we can indicate that using
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+the generalization relationship in our class diagram.