http://hl7.org/fhir/StructureDefinition/valueset-supplement|4.0.1

This extension declares that a value set depends on a particular supplement and should not be used in its absence.

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