%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  1. Auflage
%% 
%%  Beispiel 15-02-53 auf Seite 763.
%% 
%%  Copyright (C) 2011 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
verbatimtex
%% 
\documentclass[]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{textcomp}
\begin{document}
etex
% --- start of displayed preamble in the book ---
input metaobj;
% --- end of displayed preamble in the book ---
beginfig(1)
newCircle.Start("Start");newBox.Ende("Ende");
Start.c=origin; Ende.c=Start.c+(2cm,1cm);
ncline(Start)(Ende);
nccurve(Start)(Ende) "arrows(<-)", "angleA(90)",
  "posA(nw)", "posB(w)";
nccurve(Ende)(Start) "arrows(<-)", "posA(e)",
 "angleA(0)", "posB(e)", "angleB(180)";
drawObj(Start,Ende);
endfig;
end;
\end{document}