http://hl7.org/fhir/StructureDefinition/codesystem-conceptOrder|4.0.1

Identifies the relative order in which concepts within the value set should be presented to a user.
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Extension
typehttp://hl7.org/fhir/StructureDefinition/Extension
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/integer