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This section covers several general topics related to SNOMED CT release files including:

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This section covers several general topics related to SNOMED CT release files.

The next two sections provide the detailed specifications of the release files:

3. Component Release Files Specification

Files that represent the main SNOMED CT components:

Concepts
Descriptions
Relationships

4. Reference Set Release Files Specification

Files that customize and enhance SNOMED CT by representing:

Subsets of concepts and descriptions
Maps to other code systems
Language and dialect preferences for different terms
Annotation of components
Associations between components
Other forms of configuration and extensibility

...

The DOCTSG is a separate document that includes guidance on Representing Terminology Data and Importing SNOMED CT Release Files.

Info

title	Historical Note

...

on Current and Previous Release File Formats

The standard format in which

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t	SNOMED CT

has been distributed since 2012 is known as

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t	Release Format 2

(RF2). It was developed in response to extensive feedback on the original release file format, now known as

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t	Release Format 1

(RF1), in which

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t	SNOMED CT

was distributed between its first release in 2002 and 2012. The SNOMED CT International Edition is no longer distributed in RF1. However, a conversion tool to general RF1 style files from the RF2 release files was made available during a transition period.

The key enhancements in

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t	RF2

were:

More robust and consistent version representation;
Inclusion of a moduleId and module dependency mechanism, which together enable modularization of releases while representing dependencies between modules;
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t Reference sets
to provide an extensible and versionable way to configure
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t SNOMED CT.
Including support for subsets, maps, annotations, alternative hierarchies, etc.;
Use of an added
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t hierarchy
to represent metadata about the structure of
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t SNOMED CT
itself.

In common with the earlier release format

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t	RF2

specifies files that:

Represent the components of
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t SNOMED CT:
(concepts, descriptions and relationships)

Provide standard representations for subsets, language preferences and maps to other codes and classifications.
Are distributed as tab-delimited text files - which represent character content in accordance with the Unicode UTF-8 specification;
Use
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t SNOMED CT Identifiers
as the permanent
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t Identifier
of released core components;
Support
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t extensions
to the
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t International Release
using
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t namespaces
allocated to licensees to denote the provenance of added components and to ensure
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t Identifier
uniqueness.

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