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Release Types

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

Versioned Views

A versioned view is formally defined as:

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.


  • 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.

The three main versioned views are:

There are two distinct types of snapshot view:

There are two distinct types of delta view:

See also 4.6. Enabling Versioned Views

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