The design of the ordered reference set supports two overall purposes:
Ordered component reference set can be used to create a simple ordered list of components, i.e. a list that do not include any nesting, or groups. It can for example be used to prioritize the sort order of the descriptions with identical terms when they are displayed. It can also be used to specify the order of descriptions displayed in a simple pick list.
Ordered reference set with no groups
Prioritization is similar to order but multiple components may have the same rank. In this case the value of the order attribute specify a priority order for a group of components.
Ordered reference set with prioritized groups.
The identifier of a SNOMED CT component that is included in the ordered list of alternative hierarchy.
Specifies the sort order of the list. The list is ordered by applying an ascending sort of the order value.
|See specification: 5.2.2 Ordered Component Reference Set|