> 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-range-reference-set.md).

# MRCM Attribute Range Reference Sets

An MRCM Attribute Range Reference Set allows attributes to be associated with a valid value range for a given SNOMED CT content type and rule strength. The range of each attribute is defined using an Expression Constraint. This expression constraint represents the set of concepts, expressions, or concrete values that may be used as the value of the given attribute.

MRCM Attribute Range type Reference Set member properties:

| Property                 | Description                                                                                                                                  |
| ------------------------ | -------------------------------------------------------------------------------------------------------------------------------------------- |
| **Referenced component** | A reference to the SNOMED CT attribute concept to which the range defined by this member applies                                             |
| **Range constraint**     | An Expression Constraint, which defines the set of concepts that may be used as the value of the referenced attribute                        |
| **Attribute rule**       | An Expression Constraint that captures the domain, range and cardinality constraints for the given attribute, rule strength and content type |
| **Rule strength**        | Whether the given rule is mandatory (resulting in an error) or optional (resulting in a warning)                                             |
| **Content type**         | Indicates the type of SNOMED CT content over which this rule applies                                                                         |


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