A constraint on the number of times that a specific attribute may be included in the same attribute group.
Notes
- Constraints on attribute in group 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 group.
- 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 in group cardinality is NOT the same as attribute group cardinality constraint.
Attribute group cardinality constraint is defined as:
- A constraint on the number of times that an attribute group may be included in the same concept definition or expression.
Examples
The following expression constraint restricts cardinality in-group and would require a clinical finding whose definition has no more than one finding site in each group. However, it permits multiple groups to exist as there are cardinality constraints on the group.
In contrast, the following expression constraint is satisfied by any clinical finding whose definition has two or more non-redundant finding sites, irrespective of the attribute group in which they are contained.
A clinical finding could satisfy both the above constraints by have two or more groups each of which contains one finding site.
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