...

• Each row in a delta release file represents either a new 

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   or

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  , 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 

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  . 
• A delta release added to the previous 

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   is identical to the 

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   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,
but
• 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.

Related Links

• Glossary

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    • delta release

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      t snapshot release

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      t full view

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• Release File Specification
  • 3.2 Release Types