http://hl7.org/fhir/StructureDefinition/Expression|4.0.1

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.
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Element
typehttp://hl7.org/fhir/StructureDefinition/Expression
Expression.description.typehttp://hl7.org/fhir/StructureDefinition/string
Expression.name.typehttp://hl7.org/fhir/StructureDefinition/id
Expression.language.typehttp://hl7.org/fhir/StructureDefinition/code
Expression.language.binding.valueSethttp://hl7.org/fhir/ValueSet/expression-language
Expression.expression.typehttp://hl7.org/fhir/StructureDefinition/string
Expression.reference.typehttp://hl7.org/fhir/StructureDefinition/uri