> 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-attribute-domain-reference-sets.md).

# MRCM Attribute Domain Reference Sets

An MRCM Attribute Domain Reference Set allows attributes to be associated with the domains in which they may be applied. It also allows grouping and cardinality constraints to be specified for each attribute and domain combination. For each attribute-domain rule, the strength of the rule (e.g. Mandatory concept model rule), and the content type over which this rule applies (e.g. All SNOMED CT content) are also specified.

MRCM Attribute Domain type Reference Set member properties:

| Property                           | Description                                                                                                                                                                                                                                                                                                                                                                                                                                |
| ---------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| **Referenced component**           | A reference to the SNOMED CT attribute concept to which the attribute-domain rule defined by this member applies                                                                                                                                                                                                                                                                                                                           |
| **Domain ID**                      | A reference to the SNOMED CT concept that identifies the relevant concept domain                                                                                                                                                                                                                                                                                                                                                           |
| **Is grouped**                     | <p>Whether or not the referenced attribute is treated by a Description Logic reasoner as belonging to a relationship group, when applied to a concept in the given domain.</p><ul><li>grouped = 1 (true): attribute is treated by a Description Logic reasoner as belonging to a relationship group.</li><li>grouped = 0 (false): attribute is treated by a Description Logic reasoner as not belonging to a relationship group.</li></ul> |
| **Attribute cardinality**          | The number of times the given attribute can be assigned a (non-redundant) value within the definition of each concept or expression                                                                                                                                                                                                                                                                                                        |
| **Attribute in group cardinality** | The number of times the given attribute can be assigned a (non-redundant) value within a single relationship group as part of the definition of a concept or expression                                                                                                                                                                                                                                                                    |
| **Rule strength**                  | Whether the given rule is mandatory (resulting in an error) or optional (resulting in a warning)                                                                                                                                                                                                                                                                                                                                           |
| **Content type**                   | The type of SNOMED CT content over which this rule applies                                                                                                                                                                                                                                                                                                                                                                                 |


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