# Naming Conventions for Reference Sets

National Release Centres and others may create additional reference sets. A namespace is required to create a new reference set, as each reference set is defined by a concept. The concept's FSN and a synonym are used to name the reference set. Where a new reference set is created against an existing pattern, then the following naming convention should be used (where the text "*Specific name* " is to be replaced by the specific name of the reference set).

## [Attribute Value Reference Set](https://docs.snomed.org/snomed-ct-specifications/snomed-ct-release-file-specification/reference-set-release-file-specification/5.2-reference-set-types/5.2.1-content-reference-sets/5.2.1.3-attribute-value-reference-set/5.2.1.3-attribute-value-reference-set)

* FSN = *<mark style="color:blue;">Specific name</mark>* attribute value reference set (foundation metadata concept )
* PT = *<mark style="color:blue;">Specific name</mark>* attribute value map

## [Language Reference Set](https://docs.snomed.org/snomed-ct-specifications/snomed-ct-release-file-specification/reference-set-release-file-specification/5.2-reference-set-types/5.2.2.1-language-reference-set)

For a Language:

* FSN = *<mark style="color:blue;">Language name</mark>* \[International Organization for Standardization 639-1 code *<mark style="color:blue;">Language code</mark>*] language reference set (foundation metadata concept )
  * Example: <mark style="color:blue;">English</mark> \[International Organization for Standardization 639-1 code <mark style="color:blue;">en</mark>] language reference set (foundation metadata concept)
* PT = *<mark style="color:blue;">Language name</mark>*
  * Example: <mark style="color:blue;">English</mark>

For a Dialect:

* FSN = *<mark style="color:purple;">Dialect name</mark>* *<mark style="color:blue;">Language name</mark>* language reference set (foundation metadata concept )
  * Example: <mark style="color:purple;">Great Britain</mark> <mark style="color:blue;">English</mark> language reference set (foundation metadata concept)
* PT = *<mark style="color:purple;">Dialect code</mark>* *<mark style="color:blue;">Language name</mark>*
  * Example: <mark style="color:purple;">GB</mark> <mark style="color:blue;">English</mark>

## [Deprecated: Annotation Reference Set](https://docs.snomed.org/snomed-ct-specifications/snomed-ct-release-file-specification/reference-set-release-file-specification/5.2-reference-set-types/5.2.1-content-reference-sets/5.2.1.6-deprecated-annotation-reference-set)

{% hint style="warning" %}
The use of this reference set structure is now discouraged.
{% endhint %}

* FSN = *<mark style="color:blue;">Specific name</mark>* annotation reference set (foundation metadata concept )
* PT = *<mark style="color:blue;">Specific name</mark>* annotation reference set

## [Association Reference Set](https://github.com/SNOMED-Documents/snomed-release-file-specification/blob/main/5-reference-set-release-files-specification/5.2-reference-set-types/5.2.1-content-reference-sets/5.2.1.4-association-reference-set)

* FSN = *<mark style="color:blue;">Specific name</mark>* association reference set (foundation metadata concept )
* PT = *<mark style="color:blue;">Specific name</mark>* association reference set

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