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

If the questionnaire-unit-open extension indicates that additional units other than the set of options provided for the question are allowed, this indicates the code system those units are expected to be drawn from. This extension SHOULD be present on any question where questionnaire-unit-open allows additional coded values.

Structure JSON Dependencies FHIRSchema Other Versions Dependant (0)Elements Summary

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