Expression

complex type

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.

Official spec

Path	Card.	Type	Description & Constraints
Expression	0..*	—	An expression that can be used to generate a value
.id	0..1	String	Unique id for inter-element referencing
.extension	0..*	Extension	Additional content defined by implementations
.descriptionΣ	0..1	string	Natural language description of the condition
.nameΣ	0..1	id	Short name assigned to expression for reuse
.languageΣ	1..1	code	text/cql \| text/fhirpath \| application/x-fhir-query \| etc. Bindingexpression-language(extensible)
.expressionΣ	0..1	string	Expression in specified language
.referenceΣ	0..1	uri	Where the expression is found