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Logical Model

Release File Representations

References

Concepts

Each concept is represented by a row in the

Specref

RefType	file
t	concept

release file.

4.2.1 Concept File Specification

Descriptions

Each description is represented by a row in the

Specref

RefType	file
t	description

release file.

4.2.2 Description File Specification

Stated Concept Definitions

Each stated

Gloss

t	concept definition

is represented by a set of rows in the

Specref

t	OWL axiom reference set file

, which follows the format of an OWL Expression Reference Set. Each row contains an

Gloss

t	axiom

that forms part of the definition of the

Gloss

t	concept

identified by the referencedComponentId.

Notes:

As well as representing the definitions of individual concepts, the
Specref
RefType file
t OWL axiom reference set
represents characteristics of
Gloss
t attributes
including transitivity, reflexivity and property chains.
The
Specref
RefType file
t OWL ontology reference set
also follows the OWL Expression Reference Set pattern. It contains general information about the terminology, which is required by a
Gloss
t description logic classifier
but is not subject to significant changes between release versions.

Note

title	Change Note

This representation was introduced in July 2018 and, following a transitional period, now fully represents all stated concept definitions.

5.2.21 1.9 OWL Expression Reference Set

DOCOWL

DOCLPS

Inferred Concept Definitions

Each inferred

Gloss

t	concept definition

is represented by a set of rows in the

Specref

RefType	file
t	relationship

release file. Each row in the set that defines a concept, represents a necessary, defining relationship with another concept. The

Specref

t	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

Specref

RefType	file
t	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

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Footnote block

Prior to July 2018 the
Gloss
t stated view
of concept definitions were represented by relationships in the
Specref
RefType file
t stated relationship file
. During a transitional period between July 2018 and July 2019 the OWL reference sets were introduced. Since the end of that transitional period in July 2019, the stated relationship file is no longer maintained or distributed.
The representation of the
Gloss
t inferred view
of concept definitions is unchanged from the perspective of the release file structure. However, the nature and quality of the inferred relationships changed as a result of inferences derived from the enhanced definitions represented as axioms in the OWL axiom reference set.
More information on these changes is available in this document in Section 5.2.1.21 9 OWL Expression Reference Set and a historical note on Representation of the Logical Model - Before July 2018. Detailed information about the representation of SNOMED CT definitions using OWL axioms is provided by the SNOMED CT OWL Guide and SNOMED CT Logic Profile Specification.
The SNOMED CT E-Learning Presentation Updates to Support Advanced Description Logic also provides an overview of the reasons for these changes.

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