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).
For a Language:
Example: 900000000000507009 English [International Organization for Standardization 639-
Example: 900000000000507009 |English|
For a Dialect:
Example: 900000000000508004 |GB English|