next and nextto ,a built-in Tcl command, in TclOO allow a method to call an upstream method which it has overridden.
In TclOO/Tcl 8.6:
next in TclOO is inspired by XOTcl's eponymous comand, and the semantics are slightly different. TclOO's next effectively does an uplevel inside itself).
nextto selects the method according to class.