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Private Visibility
When the value of private is specified for the visibility property of an association end it signifies only the classifier connected at the source (far) end may traverse the relationship and use the role name in expressions.
Explanation
The visibility property of an association end specifies the visibility of the role when viewed from the classifier at the far (source) end of the association. It is an important semantic or structural property that describes the accessibility (visibility) of the role. The value private means that the role (association end) can be traversed or accessed only by the classifier that is attached at the far (target) end and by no other classifiers.
An association end is related to the value private which specifies the visibility property because this attribute is added to an association end to increase the precision of the semantics, describing an aspect of the way the classifier participates in the association relationship.
The value public is related to the value of private because they are both values that can be set for the visibility property of an association end. The value public is less restrictive than private.
The value protected is related to the value of private because they are both values that can be set for the visibility property of an association end. The value protected is less restrictive than private.
The value package is related to the value of private because they are both values that can be set for the visibility property of an association end. The value protected is less restrictive than private.
