Machine Readable Concept Model

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While the document refers to the RF2 format and the Expression Constraint Language, the specification of these standards are out of scope. Additionally, this document does not go into details about how to implement the MRCM within a terminology authoring or Electronic Health Record environment.

The scope of the MRCM includes rules that define the domain, range, cardinality and groupability of each attribute in the SNOMED CT concept model. Other related information, such as property chains (including attribute transitivity), expression templates for authoring, and description templates are not within scope of the MRCM. 

Audience

The target audiences of this document include:

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The following table contains the definition of terms used within this document. Please refer to the IHTSDO Glossary for additional SNOMED CT definitions.

Term

Definition

Compositional Grammar

The set of rules that govern the way in which SNOMED CT expressions are represented as a plain text string.

Concept Model

The model used to specify logical definitions of SNOMED CT concepts, using a combination of formal logic and a set of rules that determine the permitted sets of relationships between particular types of concepts.

Domain

The set of concepts which may be refined using a given attribute.

Footnote Macro

Please note that this definition differs from the OWL 2 rdfs:domain axiom, which asserts that "the subjects of such property statements must belong to the class extension of the indicated class description".

Expression

A structured combination of one or more concept identifiers used to express a clinical idea.Expression Constraint

A computable rule that can be used to define a bounded set of clinical meanings.Machine Readable Concept Model (MRCM)

A representation of the rules that comprise the SNOMED CT Concept Model in a form that can be processed by computer software and applied to validate content.

Postcoordinated Expression

A representation of a clinical meaning using a combination of two or more concept identifiers.Precoordinated Expression

A representation of a clinical meaning using a single concept identifier.

Range

The set of concepts that are allowed as the value of an attribute.

Footnote Macro

Please note that this definition differs from the OWL 2 rdfs:range axiom, which asserts that "the values of this property must belong to the class extension of the class description or to data values in the specified data range.".

Reference Set

A SNOMED CT file structure consisting of a set of references to SNOMED CT components.Substrate

The SNOMED CT content over which an expression constraint is evaluated or a query is executed.

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