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900000000000516008 | Annotation type reference set|

allows text strings 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.

Reference Sets Practical Guide > Annotation Reference Set > worddav748ed4898436d3b3538a334f800dbdf5.png

Reference Specific Attributes

Besides from the 4 identification and versioning attributes, the annotation reference set type has following attributes.

Field	Data type	Purpose
referencedComponentId	SCTID	The identifier of the to be annotated.
annotation	String	The text annotation to attach to the identified by referencedComponentId.