# attribute group cardinality constraint

## attribute group cardinality constraint

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

#### Notes

* 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.
```

\_\_

#### Examples

* 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|](http://snomed.info/id/373873005) :\
\[1..3] { [127489000 |Has active ingredient|](http://snomed.info/id/127489000) = < [105590001 |Substance|](http://snomed.info/id/105590001) }

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