subset

subset

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.

Examples

• A subset of SNOMED CT concepts from all of the concepts in a particular version of a SNOMED CT edition.

• A subset of SNOMED CT descriptions from all the descriptions in a particular version of a SNOMED CT edition.

Related Links

• Glossary

  • Extensional subset definition

  • Intensional subset definition

  • Reference set

• Reference Sets Practical Guide

  • 2.1. Subset

• Wikipedia

  • Subset

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