http://hl7.org/fhir/StructureDefinition/designNote|5.2.0

Information captured by the author/maintainer of the questionnaire for development purposes, not intended to be seen by users.

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