optional concept from the Object Oriented Software Engineering knowledge base

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Next multiplicity: default multiplicity Up: multiplicity Previous multiplicity: one

optional

subject fact

optional is a subtopic of 5.3 - Associations and Multiplicity 2001-08-30 14:56:54.0
is written as 0..1
is a kind of multiplicity
means there can be either zero or one object linked to an object at the other end of the association

multiplicity is drawn as a range separated by two dots (e.g. 2..3) in a UML class diagram 2001-08-30 14:56:39.0
should be as least restrictive as possible so as not to reduce the flexibility of the system

optional	is a subtopic of 5.3 - Associations and Multiplicity
	is written as 0..1
	is a kind of multiplicity
	means there can be either zero or one object linked to an object at the other end of the association
multiplicity	is drawn as a range separated by two dots (e.g. 2..3) in a UML class diagram
multiplicity	should be as least restrictive as possible so as not to reduce the flexibility of the system