900000000000516008 |Annotation type reference set|allows String to be associated with components for any specified purpose. So, where the 900000000000521006 |Association type reference set|linked a SNOMED CT component to another SNOMED CT components, the 900000000000516008 |Annotation type reference set| allow a SNOMED CT component to be linked to a non-standardized string annotation.
Figure 5.6-1: Illustration of the general functionality of Annotation reference sets of the general functionality of Annotation reference sets
Besides from the 4 identification and versioning attributes, the annotation reference set type has following attributes.
The identifier of the component to be annotated.