# historical reference set

## historical reference set

A reference set that provides information about concepts or descriptions that have been inactivated.

#### Notes

* There are two types of _historical reference sets_ :
  * Inactivation Reference Sets which indicate the reason for inactivation of a particular component.
  * Historical Association Reference Sets which associate inactive concepts with one or more active concepts that represent the same, similar or a possible meaning of an inactive concept.

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