error with two examples of the manual

[Alain Matthes-2]

Hello

I try to make a document with some examples of the pgfmanual (version  
2.0) and
I get an error if the first example is not in a group.

The first example is page 223 and the second is page 192. Without  
\begingroup
  and \endgroup, I get

Latex Error: ./trunk.tex:92 Package pgfkeys Error: I do not know the  
key '/tikz/trunk'
and I am going to ignore it. Perhaps you misspelled it.


The solution with a group is not completely satisfactory because I can  
not use the logo
for example in another page

I would like to know if there is another method ?

Best Regards
Alain Matthes

The code

\documentclass[11pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[upright]{fourier}
\usepackage{tikz}
\usetikzlibrary{%
   arrows,%
   calc,%
   plotmarks,%
   chains,%
   topaths,%
   trees,%
   through,%
   positioning,%
   scopes}

\begin{document}
\begingroup
\tikzset{
   ld/.style={level distance=#1},lw/.style={line width=#1},
   level 1/.style={ld=4.5mm, trunk,          lw=1ex ,sibling angle=60},
   level 2/.style={ld=3.5mm, trunk!80!leaf a,lw=.8ex,sibling angle=56},
   level 3/.style={ld=2.75mm,trunk!60!leaf a,lw=.6ex,sibling angle=52},
   level 4/.style={ld=2mm,   trunk!40!leaf a,lw=.4ex,sibling angle=48},
   level 5/.style={ld=1mm,   trunk!20!leaf a,lw=.3ex,sibling angle=44},
   level 6/.style={ld=1.75mm,leaf a,         lw=.2ex,sibling angle=40},
}
\pgfarrowsdeclare{leaf}{leaf}
   {\pgfarrowsleftextend{-2pt} \pgfarrowsrightextend{1pt}}
{
   \pgfpathmoveto{\pgfpoint{-2pt}{0pt}}
   \pgfpatharc{150}{30}{1.8pt}
   \pgfpatharc{-30}{-150}{1.8pt}
   \pgfusepathqfill
}

\newcommand{\logo}[5]
{
   \colorlet{border}{#1}
   \colorlet{trunk}{#2}
   \colorlet{leaf a}{#3}
   \colorlet{leaf b}{#4}
   \begin{tikzpicture}
     \scriptsize\scshape
     \draw[border,line width=1ex,yshift=.3cm,
           yscale=1.45,xscale=1.05,looseness=1.42]
       (1,0) to [out=90, in=0]    (0,1)  to [out=180,in=90]  (-1,0)
             to [out=-90,in=-180] (0,-1) to [out=0,  in=-90] (1,0) --  
cycle;

     \coordinate (root) [grow cyclic,rotate=90]
     child {
       child [line cap=round] foreach \a in {0,1} {
         child foreach \b in {0,1} {
           child foreach \c in {0,1} {
             child foreach \d in {0,1} {
               child foreach \leafcolor in {leaf a,leaf b}
                 { edge from parent [color=\leafcolor,-#5] }
         } } }
       } edge from parent [shorten >=-1pt,serif cm-,line cap=butt]
     };

     \node [text centered,text width=2cm,below] at (0pt,-.5ex)
     { \textcolor{border}{T}heoretical \\ \textcolor{border}{C}omputer  
\\
       \textcolor{border}{S}cience };
   \end{tikzpicture}
}
\begin{minipage}{3cm}
   \logo{green!80!black}{green!25!black}{green}{green!80}{leaf}\\
   \logo{green!50!black}{black}{green!80!black}{red!80!green}{leaf}\\
   \logo{red!75!black}{red!25!black}{red!75!black}{orange}{leaf}\\
   \logo{black!50}{black}{black!50}{black!25}{}
\end{minipage}
\endgroup

\begin{tikzpicture}
\node {root}
child {
node {left}
edge from parent
node[left] {a}
node[right] {b}
}
child {
node {right}
child {
node {child}
edge from parent
node[left] {c}
}
child {node {child}}
edge from parent
node[near end] {x}
};
\end{tikzpicture}
\end{document}

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