Release File Specification

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Given the RF2's history tracking capability, it is possible to perform a number of different releases of content:

Release type

   Description

Full

A full release is a release type in which the release files contain every version of every component and reference set member ever released.

Snapshot

A snapshot release is a release type in which the release files contain only the most recent version of every component and reference set member released, as at the release date. 

Delta

A delta release is a release type in which the release files contain only rows that represent component versions and reference set member versions created since the previous release date. 

Notes

  • Each row in a delta release file represents either a new component or reference set member, or a change to an existing component or reference set member since the previous release date.
  • A delta release identifies differences between two versions of the same release package. 
  • A delta release added to the previous full release is identical to the full release of the new version.
  • The previous release date, on which a delta release is based, is usually the date of the most recent previous release. However, that may not always be the case. For example, where interim releases are made between two major releases there may be a combined delta release covering a period since a previous major release. 

Please note : 

  • Delta files have been removed from the SNOMED International release package, Managed Service Extensions and Derivative packages.  However a Delta Generation Tool is available for those who need it. The Delta Generation Tool allows users to create their own Delta between two fixed release dates - you can find it here: https://github.com/IHTSDO/delta-generator-tool/releases.

There are valid use cases for each type of Release Type. Each International releasewill incorporate all three of these Release Types, allowing users to choose the most appropriate format for their needs.

A full releasewill always be available from release centers. Optionally, other Release Formatsmay also be made available. Where out of cycle releases are made, these will follow the same format as standard cycle releases.

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