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 shows how SNOMED CT release files will represent the logical model after the completion of the transitional process. Note that the only structural change is the replacement of the stated relationship file with the OWL expression reference set files. The representation of the inferred view of concept definitions is unchanged from the perspective of the release file structure. However, the nature and quality of the inferred relationships will changes as a result of inferences derived from the enhanced definitions represented as axioms in the OWL axiom reference set. 


Logical ModelRelease File RepresentationsReferences
Concepts

Each concept is represented by a row in the concept release file.

4.2.1 Concept File Specification
Descriptions

Each description is represented by a row in the description release file.

4.2.2 Description File Specification
Stated Concept Definitions

Each stated concept definition is represented by a set of rows in the OWL axiom reference set file, which follows the format of an OWL Expression Reference Set. Each row contains an axiom that forms part of the definition of the concept identified by the referencedComponentId.

Notes:

Change Note

This representation was introduced in July 2018 and, following a transitional period, will fully represent all stated concept definitions during 2019.

5.2.21 OWL Expression Reference Set

SNOMED CT OWL Guide

SNOMED CT Logic Profile Specification

Inferred Concept Definitions

Each inferred concept definition is represented by a set of rows in the relationship release file. Each row in the set that defines a concept, represents a necessary, defining relationship with another concept. The definitionStatusId column in the concept file row indicates whether the set of defining relationships is sufficient to define the concept.

4.2.3 Relationship File Specification
Other Related Information

Represented by a range of reference set release files that conform to the extensible reference set file format.

Each row in a reference set refers to a concept or description as a member of the set.The extensible structure allows different types of related information to be associated with the referenced component.

5.2 Reference Set Types

Practical Guide to Reference Sets



More Information About Concept Definition Updates


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