http://hl7.org/fhir/StructureDefinition/Expression|5.0.0

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.
NameFlagsCardTypeDescription & Constraints
Expression
0..*An expression that can be used to generate a value
 
description
Σ
0..1stringNatural language description of the condition
 
name
Σ
0..1codeShort name assigned to expression for reuse
 
language
Σ
0..1codetext/cql | text/fhirpath | application/x-fhir-query | etc. ExpressionLanguage (extensible)
 
expression
Σ
0..1stringExpression in specified language
 
reference
Σ
0..1uriWhere the expression is found