http://hl7.org/fhir/StructureDefinition/servicerequest-questionnaireRequest|5.2.0

Reference to a specific Questionnaire Resource as an ordered item. Allows for ordering a specific questionnaire to be completed.

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