%% 
%%  A DANTE-Edition example
%% 
%%  Example 16-02-13 on page 232.
%% 
%%  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.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{177.70511pt}
\setlength\parindent{0pt}

\usepackage{pstricks,pst-node}

\begin{document}
\cnode(0.5,0){.5cm}{root}%
\cnode*(3,1){4pt}{A}\cnode*(3,0){4pt}{B}%
\cnode*(3,-1){4pt}{C}
\psset{nodesep=3pt}
\ncline{root}{A}  \ncput*{above}
\ncline{root}{B}  \ncput*{on}
\ncline{root}{C}  \ncput*{below}
\par\vspace{3cm}
\cnode(.5,0){.5cm}{root}\cnode*(3,1){4pt}{A}%
\cnode*(3,0){4pt}{B}\cnode*(3,-1){4pt}{C}
\psset{nodesep=3pt}
\ncline{root}{A}  \ncput*[ref=rt]{above}
\ncline{root}{B}  \ncput*[ref=lb]{on}
\ncline{root}{C}  \ncput*[ref=lt]{below}
\end{document}