specifies the content of each of the .

This table is followed by illustrations of each of the using the small same pattern of content development over seven release cycles. These illustrations highlight the key differences and the between the .


SNOMED CT Release Types

Full

The files representing each type of component contain every version of every component ever released.

Snapshot

The files representing each type of component contain one version of every component released up to the time of the snapshot. The version of each component contained in a snapshot is the most recent version of that component at the time of the snapshot.

Delta

The files representing each type of component contain only component versions created since the previous release. Each component version in a represents either a new component or a change to an existing component.

The seven columns in each of the following illustrations represent the content of seven releases (numbered 1-7). Each is identified by a letters (A-K). A version is represented by the identifying letter followed by a number (1-7) representing the release cycle in which that version became effective.

 shows the content of a series of . The yellow background color highlights the set of versions that are also present in the snapshot for the same ( see ). versions are shown in gray in releases versions after they have been superseded by a new version. Newly added versions, shown in red, are also present in the delta for the same (see ).

The content of the in any chosen version is identical to the combined content of all the up to and including that version. Thus adding a to the previous version of the creates the for the new version. The is derived from the by removing all except the most recent version of each .

  


Full release illustration

  


Delta release illustration

  


Snapshot release illustration


Note: In a real each of the letters A-K would be replaced by a id (a ) and each of the release cycle numbers 1-7 would be replaced by the of a .