# id (field)

A field that provides the unique identifier of a component ( concept, description or relationship) or reference set member .

Note:

* The data type of the *id* for a component is SCTID and this identifier is used to refer to the component .
* The data type of the *id* for a reference set member is UUID. This identifier is only used to support versioning of a rows (member) in a Reference set it does not identify the Reference set itself (see refsetId) nor does it identify to a component refered to by the Reference set (see referencedComponentId).

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