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2.1. Subset

Created by Anne Randorff Højen on 2019-Jan-31

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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

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