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The pattern of a specific reference set type is described by a Descriptor Template. This means that the Descriptor Template is represented by a set of members of the
scg-expression . All Descriptor Templates present in the international Release of SNOMED CT can be found in the reference set Descriptor.
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An organization that releases reference sets should only release them without Descriptor Templates if the reference set follows a predefined pattern or if it is sure that its consumers do not require the information held within the Descriptor Template. You should note that Descriptor Templates are optional for other organizations, besides from SNOMED International, that create reference sets that do not follow a predefined pattern. However, we strongly recommend to specify the reference set descriptor template in the reference set Descriptor, to support automatic processing, validation and sharing of the reference sets.The diagram below illustrates the different reference set types and highlight some of the specific reference sets that are included in the International Edition of SNOMED CT.
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