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The basic 

Gloss
t reference set

 file structure enables representation of subsets fo SNOMED CT components. However, the reference set format is extensible, allowing it to be used for a wide range of other purposes. For more details about the requirements that reference sets can address please see the Practical Guide to Reference Sets. 

The basic reference set structure can be extended by adding one or more fields. Each of these fields will hold additional specific values related to each member. Three general data types are supported in the additional columns. These are

• Specref
  t Integer

• Specref
  RefType (data type) t String

   and

• Gloss
  t Component

   (a reference to a 

  Gloss
  PreSpace false t SNOMED CT component

  )

Finer grained interpretation of these data types can also be specified using a special metadata

Gloss
t reference set

 known as the 

Concept
t 900000000000456007 Reference set descriptor

.

The 

Gloss
t reference Set

 patterns that are supported as part of the 

Gloss
t International Edition

 are documented in 5.2 Reference Set Types. Additional 

Gloss
t reference set

 patterns can also be created as part of an extension to support additional use case (see 45524353).

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