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Requirements for Manual Enumeration

Identifying reference set members by manual enumeration is useful when the number of members required is limited or when migrating from a well-specified domain. The source information may come from a variety of sources, such as:

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Manual enumeration is also useful when the reference set should be stable over time, i.e when addition of concepts, in subsequent releases of SNOMED CT, is not required to be reflected in the reference set. 

Requirements for Intensional Definition

Identifying reference set members intensionally is useful for creating subset of concepts who share a set of common characteristics, such as:

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