Release File Specification

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This section includes information about covers several general topics related to SNOMED CT release file

Gloss
trelease packages
and
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trelease files
including:

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The following two sections provide detailed specification specifications of release file is provided in the two section that follow this one: the release files.

  • Section 4 3. Component Release Files SpecificationFiles  contains details of release files that represent the main SNOMED CT components:

    • Concepts

    • Descriptions

    • Relationships
    4.
  • Section 5 Reference Set Release Files Specification
    Files that can be used to  contains details of release 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

...


 


Info
titleHistorical Note on Current and Previous Release File Formats

The standard format in which 

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tSNOMED CT
has been distributed since 2012 is known as 
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tRelease Format 2
(RF2). It was developed in response to extensive feedback on the original release file format, now known as
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tRelease Format 1
(RF1), in which
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tSNOMED CT
was distributed between its first release in 2002 and 2012. The SNOMED CT International Edition RF1 format is now deprecated and no longer supported or distributed in RF1. However, a conversion tool to general RF1 style files from the RF2 release files is available.

The key enhancements in

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tRF2
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;

  • Gloss
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    tReference sets
    to provide an extensible and versionable way to configure 
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    tSNOMED CT.
    Including support for subsets, maps, annotations, alternative hierarchies, etc.;

  • Use of an added

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    thierarchy
    to represent metadata about the structure of
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    tSNOMED CT
    itself.

In common with the earlier release format

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tRF2
specifies files that: 

  • Represent the components of

    Gloss
    tSNOMED CT:
    : 

    • Gloss
      tConcepts

    • Gloss
      tDescriptions

    • Gloss
      tRelationships

  • 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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    tSNOMED CT Identifiers
    as the permanent
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    tIdentifier
    of released core components;

    • Support
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    textensions
    to the
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    tInternational Release
    using
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    tnamespaces
    allocated to licensees to denote the provenance of added components and to ensure
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    tIdentifier
    uniqueness.

    .


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