Appendix C: Release Types and Versioned Views

Release Types

SNOMED CT release packages include the following three distinct representations of the terminology content.

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

See also C.2. Release Type Support for Versioned Views.

Versioned Views

A versioned view is formally defined as: A set of component versions and reference set member versions defined by characteristics of their effectiveTimes. From a practical perspective, a versioned view is the result of filtering the full release files based on criteria that return a consistent representation of the content of these files as it was (or would have been) at a particular point in time.	Notes Versioned views and release types are closely related. A release type is a physical representation of a particular versioned view. Some versioned views are not instantiated as release types but all valid versioned views of a SNOMED CT edition can be generated from a full release of that edition. A delta view is a view of SNOMED CT that contains only rows that represent changes to components and reference set members since a specified date or between two specified dates in the past. A full view is a view of SNOMED CT that includes all versions of all components and reference set members in a full release. A snapshot view is a view of SNOMED CT that includes the most recent version of all components and reference set members at a specified point in time.
*The three main versioned views* are:**
The full view, which is a view of SNOMED CT that includes all versions of all components and reference set members in a full release.
A snapshot view which is a view of SNOMED CT that includes the most recent version of all components and reference set members at a specified point in time.	*There are two distinct types of snapshot view:* A current snapshot view, which is a snapshot view for the date of the most recent release. A retrospective snapshot view, which is a snapshot view for a specified snapshot date.
A delta view, which is a view of SNOMED CT that contains only rows that represent changes to components and reference set members since a specified date or between two specified dates in the past.	*There are two distinct types of delta view:* The current delta view, which is a delta view for the date range between the most recent release date and the immediately preceding release date. A retrospective delta view, which is a delta view for a specified date range.

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Release Types

Versioned Views

Notes