A constraint on the number of times that a specific attribute may be included in the same concept definition or expression.


  • Constraints on attribute cardinality apply only to non-redundant attributes. A redundant attribute is an attribute with a value that is subsumed by another attribute in the same concept definition or expression.
  • Cardinality constraints are represented by square brackets containing a minimum value value represented as an integer, optionally followed by two dots and a maximum value represented as an integer or as an asterisk *.
    • If the maximum is omitted then the maximum cardinality is the same as the minimum cardinality.
    • If the maximum is an asterisk * the maximum cardinality is unlimited.


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