Expression
Base StructureDefinition for Expression Type: A expression that is evaluated in a specified context and returns a value. The context of use of the expression must specify the context in which the expression is evaluated, and how the result of the expression is used.
Complex data type in FHIR R4. Maturity: Not stated.
Elements
| Element | Type | Cardinality | Description |
|---|---|---|---|
id | string | 0..1 | Unique id for inter-element referencing |
extension | Extension | 0..* | Additional content defined by implementations |
description | string | 0..1 | Natural language description of the condition |
name | id | 0..1 | Short name assigned to expression for reuse |
language | code | 1..1 | text/cql | text/fhirpath | application/x-fhir-query | etc. |
expression | string | 0..1 | Expression in specified language |
reference | uri | 0..1 | Where the expression is found |
Reference
Official FHIR R4 specification: Expression.