A constraint on the number of times that an attribute group may be included 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.
Attribute group cardinality is NOT the same as attribute in group cardinality.
Attribute in group cardinality constraint is defined as:
- A constraint on the number of times that a specific attribute may be included in the same attribute group.

The expression constraint below is satisfied only by products with one, two or three attribute groups, which each contain at least one active ingredient relationship.

< 373873005 |Pharmaceutical / biologic product| :
[1..3] { 127489000 |Has active ingredient| = < 105590001 |Substance| }

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attribute group cardinality constraint