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The 

Notes: 

1. The modiferId field has been included at this stage as the

   Gloss
   SpacePreSpace truefalse t RF2

   format is likely to be stable for at least a five year period, without addition or deletion of fields. Within that period it is anticipated that other 

   Specref
   RefType (field) t modifierId

    values will be added. Therefore, although not fully implemented at this stage, this field has been included in the initial RF2 specification as it represents an integral part of the

   Gloss
   SpacePreSpace truefalse t Description Logic

   used by

   Gloss
   PreSpace false t SNOMED CT.

2. Any expansion of

   Gloss
   SpacePreSpace truefalse t SNOMED CT

   to include

   Gloss
   SpacePreSpace truefalse t relationships

   with a 

   Specref
   RefType (field) t modifierId

    set to a value other than

   Concept
   t 900000000000451002|Some| ShowFormat inline

   will be discussed with

   Gloss
   SpacePreSpace truefalse t Members

   prior to introduction.

3. Changes have been made to the "Immutability" values shown in the above table in the 2014-07-31 version. These changes reflect the fact that the values in the following columns of a uniquely identified relationship have occurred in historical data and in these cases tracking the history of these changes is of greater value that insisting on immutability. 

   • relationshipGroup: The number can change though the logical content of the group represented should not change. Additionally no significance should be read into the relationshipGroup value of an inactive

     Gloss
     PreSpace false t relationship;

   • characteristicType: This has changed in historical data but should not change in future;
   • modifierId: Since there is currently only one value for this no changes are possible but if the permitted values are extended as suggested above then it is likely that changes would be required.