http://hl7.org/fhir/StructureDefinition/cqf-expression|5.2.0

An expression that, when evaluated, provides the value for the element on which it appears.

element_id	types
Extension
Extension.extension
Extension.url
Extension.value[x]	Expression
Extension
Extension.id	http://hl7.org/fhirpath/System.String
Extension.extension	Extension
Extension.url	http://hl7.org/fhirpath/System.String
Extension.value[x]	Expression