> For the complete documentation index, see [llms.txt](https://docs.snomed.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.snomed.org/snomed-international-documents/snomed-ct-glossary/m/mrcm-reference-set.md).

# mrcm reference set

## MRCM reference set

A reference set designed to support representation of Machine Readable Concept Model.

#### Notes

* There are four types of *MRCM reference set* each of these represents different elements of the Machine Readable Concept Model (MRCM).
  * MRCM Domain Reference Set enumerates the concept model domains to which attributes may be applied. The set of concepts that are in each domain is represented by an expression constraint.
  * MRCM Attribute Domain Reference Set associates each concept model attribute with the domains or domains to which it may be applied.
  * MRCM Attribute Range Reference Set associates each attribute with the valid concept model range for values that can be applied to that attribute. The value range is represented by an expression constraint.
  * MRCM Module Scope Reference Set specifies the set of *MRCM reference sets* applicable to content in each module.

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