A constraint on the number of times that a specific  may be included in the same .

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 . 

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.

  < 404684003 |Clinical finding|: {[0..1] 363698007|Finding site| = < 91723000 |Anatomical structure|}

• 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.

  < 404684003 |Clinical finding|: [2..*] 363698007 |Finding site| = < 91723000 |Anatomical structure|

• A clinical finding could satisfy both the above constraints by have two or more groups each of which contains one finding site.

Related Links

• 
• Expression Constraint Language
  
  • Cardinality
  •