http://hl7.org/fhir/StructureDefinition/codesystem-use-markdown|5.2.0

If true, the definitions of the concepts should be treated and rendered as markdown for improved presentation. This extension is deprecated as the Terminology Infrastructure work group felt there wasn't a use case for the extension.
element_idtypes
Extension
Extension.extension
Extension.url
Extension.value[x]
Extension
Extension.id
Extension.extension
Extension.url
Extension.value[x]