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Cardinality

Connection attribute has relationship to two entities of the Data model model type. It specifies the number of connections (capability) between the source object and the target object. The cardinality is shown graphically at the connection ends. The cardinality is specified for the source and target.

The connection looks as follows if, for example, you want to describe that one or more addresses may be available for a customer:

Target cardinality 1 to n