http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-collapsible|4.0.0-ballot

Indicates whether the child items of a group or question item is displayed in collapsible form.

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