A subset is defined as a set of members all of which are members of another set (from set theory in mathematics).
Notes
- In SNOMED CT, the definition of subset applies to SNOMED CT components as follows:
A subset of SNOMED CT concepts is a set of concepts taken from a wider set of concepts.
A subset of SNOMED CT descriptions is a set of descriptions taken from a wider set of descriptions.
- The members of a subset can be defined in one of two ways:
- Extensionally, by enumeration, with a simple reference set as the standard distribution format.
- Intensionally, using rules to determine inclusion, with a query reference set as the standard distribution format.
Subset Example
The diagram below shows an example of a subset. The English vowels are a subset of the set of alphabet characters included in the English alphabet
Figure 2.1-1: Subset example
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