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Chapter 2 Building an Object-Oriented Model
101
Association role properties
You can define the following properties for each of the two roles of an
association:
♦ Multiplicity
♦ Ordering
♦ Visibility
Multiplicity
The cardinality of each of the two roles of an association is called the
multiplicity. The multiplicity indicates the maximum and minimum number
of values each role can have.
Cardinality Number of instances
0..0 None
0..1 None or one
0..* None to infinity
1..1 One to one
1..* One to infinity
* Infinity
Ordering
You can define the ends of an association as being ordered or sorted.
Property Indicates
Sorted That the set of objects at the end of an association are arranged
according to the way they are defined in the model
Ordered That the set of objects at the end of an association are arranged
according to in a specific order
Unordered That the end of the association is neither sorted nor ordered