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Reference Sets can be distributed as part of the International Release, as part of a National Edition or as part of an Affiliate Edition, and the way the reference set is distributed will typically depend on how the whole Edition is distributed. However, in some situations, reference set sets may be distributed independently. 

Distributing reference sets usually involves performing any additional quality checks required to ensure that the data can be exported correctly, and then exporting the reference set from the terminology management tool. Finally, the reference set is distributed to the users, e.g. for example as release files accessed from an online library using a terminology server API. 

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The standard format for distributing SNOMED CT reference sets are the reference set format, as described in  4.2. Common Reference Set Format.  For example, an extensional definition of a subsets of components is represented as a simple reference set, and the standard format for distributing intensional definitions of concept subsets is as a query specification reference set. As part of the SNOMED CT release format, reference sets support unique identification, versioning and recognition of dependencies. 

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