> For the complete documentation index, see [llms.txt](https://docs.b2ihealthcare.com/snow-owl-authoring-platform/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.b2ihealthcare.com/snow-owl-authoring-platform/reference-sets/reference-set-types/metadata-type-reference-sets/mrcm-domain-reference-sets.md).

# MRCM Domain Reference Sets

MRCM Domain Reference Set enumerates the concept domains to which SNOMED CT attributes may be applied, and provides additional information to support these concept domains.

For each domain in the SNOMED CT concept model, the MRCM Domain Reference Set will contain exactly one member. This Reference Set member will include:

* an Expression Constraint that defines the concepts in the domain, 
* the identifier of the immediate parent domain (or domains), 
* the domain constraint defined in terms of its proximal primitive concepts and associated mandatory refinements, 
* a generic Domain Expression Template for both precoordinated and postcoordinated content,
*  and a reference to the associated guidance that provides additional human-readable text describing this domain.

MRCM Domain type Reference Set member properties:

| Property                                                 | Description                                                                                                                                                                                            |
| -------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| **Referenced component**                                 | A reference to the SNOMED CT concept that identifies the relevant concept domain                                                                                                                       |
| **Domain constraint**                                    | An expression constraint, that defines the set of concepts included in the given concept domain                                                                                                        |
| **Parent domain constraint**                             | An expression constraint, which represents the set of immediate parent domains                                                                                                                         |
| **Proximal primitive constraint**                        | Domain constraint defined in terms of its proximal primitive concepts                                                                                                                                  |
| **Proximal primitive refinement**                        | Domain constraint defined in terms of its associated mandatory refinements                                                                                                                             |
| **Domain template for precoordination/postcoordination** | A generic Domain Expression Template for precoordinated postcoordinated content. This template incorporates all of the mandatory attribute domain and range rules for precoordinated SNOMED CT content |
| **Editorial guide reference**                            | A reference to the associated guidance that provides additional human-readable text describing this domain (*Optional*)                                                                                |


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