Lookup for FHIR R5 BackboneType for use in FHIR R4

Source ElementUsageTarget
BackboneTypeUseExtensionhttp://hl7.org/fhir/5.0/StructureDefinition/extension-BackboneType
BackboneType.idUseExtensionFromAncestor-
BackboneType.extensionUseExtensionFromAncestor-
BackboneType.modifierExtensionUseExtensionFromAncestor-