proper support for "isabelle update -D DIR": avoid accidental exclusion of select_dirs (amending e5dafe9e120f);
(* Title: HOL/ZF/MainZF.thy
Author: Steven Obua
Starting point for using HOLZF.
See "Partizan Games in Isabelle/HOLZF", available from http://www4.in.tum.de/~obua/partizan
*)
theory MainZF
imports Zet LProd
begin
end