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An atttribute's cardinality is the number of values that it should possess.

Consider the example of a Person concept with attributes for Given Name, Surname, and Nickname. If a Person should have at least one Given Name, at most one Surname and zero or any number of Nicknames, then the cardinality for the attribute Given Name would be min = 1:


Surname should be set as exact = 1:


And Nickname should be min = 0: