Reference Sets Practical Guide

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A query contained in the reference set is run against the content of SNOMED CT (the

Gloss
tsubstrate
) to produce a subset of concepts, descriptions or relationships (the expansion). The query is referred to as an intensional definition of the subset. It can be run against new releases of SNOMED CT to generate an updated set of subset members. Additionally, the members of the 
Gloss
texpansion
 may also be represented in an enumerated form as a  simple reference set. An enumerated representation of a subset is referred to as an  extensional definition of a subset. The diagram below illustrates the relation between the query specification reference set and the simple reference set. The intensional definition is represented in the 'query' attribute, and the identifier for the expansion's simple reference set is represented by the concept referenced in the 'referencedComponentId' attribute. 

The two tables below illustrate the relationship between the query specification type reference set and the simple reference set. The referencedComponentId in the query specification type reference set references a concept which represent the  simple type reference set, which is used to hold the expansion of the intensional definition.

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The  Expression Constraint Language is the recommended language for specifying queries over SNOMED CT content. This language allows for a consistent and machine-readable representation of sets of clinical meanings. This means that a set of expression constraints can be used to specify the intensional definition of a range of subsets used in a particular context. The use cases for the subset generated from the queries within a query specification reference set are similar to the use cases for  simple reference sets. However, the query specification reference set type can be used anywhere a set of queries needs to be managed. 

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Field

Data type

Purpose

Specref
RefTypefield
treferencedComponentId

SCTID

The identifier (

Specref
RefTypefield
trefsetId
) of the  reference set for which members are to be generated.

Specref
RefTypefield
tquery

Specref
RefTypedata type
tString

The serialised

Specref
RefTypefield
tquery
 that can be used to (re-)generate the  reference set members.

The SNOMED CT Query Language is a formal language for representing computable queries over SNOMED CT content. 

Tip

See specification: 5.2.8 1.7 Query Specification Reference Set

 

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