The reference set example tables on this page have been revised as follows to aid clarity and understanding:

• The first four columns which are present in all release files are not shown. The omitted columns (

  Specref
  RefType (field) t id

  , 

  Specref
  RefType (field) t effectiveTime

  , 

  Specref
  RefType (field) t active

  , 

  Specref
  t moduleId

  ) are used in the same way in all referenced sets to support identification, versioning and packaging. They do not directly affect the specific features of a particular reference set or reference set type.
• Reference set columns that contains contain SNOMED CT identifiers are expanded to show details of the concept or description referenced by that identifier. In some cases, the term is shown in the same column using the expression syntax, in other cases an additional column with a name suffix '_term' has been added. In the standard reference set files only the identifier is present as in the column and there is no added column for the term. When using reference sets, the term and other details of the component are , where necessary, looked up from the relevant component release filefiles.