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.
element_idtypes
Expression
Expression.description
Expression.name
Expression.language
Expression.expression
Expression.reference
Expression
Expression.id
Expression.extension
Expression.description
Expression.name
Expression.language
Expression.expression
Expression.reference