Optional Readonlymethodwhether the member is a function, i.e. a method rather than a field (R6/RC, where both share one list)
ReadonlynameOptional Readonlytypethe member's declared type, when one is stated (S4/RC/S7); R6 declares no types
Optional Readonlyvisibility
One declared member of a class: an S4 slot, an S7 property, an RC field, or an R6 public/private entry.