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• The 

  Gloss
  t delta files GlosTerm delta release

  generated from the new release
• The

  Gloss
  t snapshot files GlosTerm snapshot release

   from the previous release

Please note: Delta files have been removed from the SNOMED International release package, but 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.

These two release artifacts enable changes to be identified, and the nature of those changes understood. The delta release files provide information about all components or reference set members which have changed since the previous release. By comparing this information to the corresponding components or reference set members in the snapshot files from the previous release, stakeholders can understand which of these changes represent additions of new components or reference set members, and which represent new versions of existing components or reference set members. For more information on the different release types please refer to the release file specification.

The table below shows how the values for the active attribute in the previous snapshot and current delta can be compared to help to determine the types of change in the release.

The types of changes that components and reference set members can undergo are inactivate, reactivate, change or add. For example, if a row (with a given id) was not present in the snapshot from the previous release, and then was present (with the same id) in the current delta release with an active value of 1, then this means that a new component or reference set member has been added. If a row (with a given id) had a value of 1 in the previous snapshot, and now has a value of 1 in the current delta, then this means that the component or reference set member has been changed.

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