Purpose

An 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.

If ranges including concrete values (such as integers or strings) are required, the Expression Constraint Language can be extended, as described for rangeConstraint in the Data Structure section on this page.

The also provides a summary of the concept model rule associated with each attribute (including all valid domains and the given range) using an Expression Constraint representation. This attribute rule can be completely auto-generated by combining information from the and the .

Data Structure

An is structured as shown in the following table.

Metadata

The following metadata hierarchy supports this reference set:

Please note that the

hierarchy is designed using 'universal restriction' logic. The hierarchy may therefore appear to be 'upside down'. However, it was designed in this way because if an MRCM rule applies to

then it also applies to the Content Types that are a supertype of this - including

and

.

Descriptor Template

The table below shows the reference set descriptor for a reference set that follows the pattern.

refsetId	referencedComponentId	attributeDescription	attributeType	attribute Order
				0
				1
				2
				3
				4

Example Data

The table below shows some example rows from a reference set that follows the format of the .

refsetId

referencedComponentId

rangeConstraint

attributeRule

ruleStrengthId

contentTypeId

<< 404684003|Clinical finding (finding)| OR << 71388002|Procedure (procedure)|

(<< 404684003|Clinical finding (finding)| OR << 272379006|Event (event)|): [0..*] { [0..*] 255234002|After| = (<< 404684003|Clinical finding (finding)| OR << 71388002|Procedure (procedure)|)}

<< 413350009|Finding with explicit context (situation)|: [0..*] { [0..1] 408729009|Finding context| = << 410514004|Finding context value (qualifier value)|}

<< 91723000 |Anatomical structure (body structure)|: [0..1] 272741003 |Laterality| = << 182353008 |Side (qualifier value)|