initial import

+*.aux
+*.fdb_latexmk
+*.fls
+*.log
+*.nav
+*.out
+*.snm
+*.synctex.gz
+*~
+*.toc
+*.vrb
+/sloc

+\documentclass{beamer}
+
+\usepackage[english]{babel}
+\usepackage[utf8]{inputenc}
+\usepackage[orientation=portrait,size=a4,scale=2]{beamerposter}
+\usepackage[absolute,overlay]{textpos}
+\usepackage{url}
+
+\usepackage{tikz}
+\usetikzlibrary{shapes.callouts}
+
+\parindent=0pt
+\setbeamertemplate{navigation symbols}{}
+
+\setlength{\TPHorizModule}{1cm}
+\setlength{\TPVertModule}{1cm}
+
+\def\${\texttt{{\color{gray}\string$}}}
+
+\def\shell #1{{\setbox0\hbox{\texttt{#1\strut}}%
+    \dimen0=\dp0 \advance\dimen0 by 5pt
+    \leavevmode\raise -\dimen0 \hbox{$\smash{\tikz\node[shell]{\texttt{#1\strut}};}$}}}
+
+\tikzstyle{shell}=[rounded corners,
+  inner sep=5pt,
+  align=flush left,
+  draw=black!10,
+  fill=black!5]
+
+\tikzstyle{guide}=[line width=3pt,
+  rounded corners,
+  cap=round,
+  color=yellow!60!gray!50!white]
+
+\def\minor #1{{\small\color{gray}#1}}
+\def\remark #1{\minor{(#1)}}
+
+\def\abcdC #1{{\color{blue!50!black!60!white}\texttt{\# #1}}}
+\def\abcdK #1{{\texttt{\color{red!50!black}#1}}}
+\def\abcdR #1{{\texttt{\color{purple!50!black}#1}}}
+\def\abcdN #1{{\texttt{\color{green!50!black}#1}}}
+\def\abcdA #1{\texttt{{\color{red!50!black}[}#1{\color{red!50!black}]}}}
+\def\abcd #1{\texttt{#1}}
+\def\NT #1{\texttt{\textit{\color{blue!50!black!60!white}#1}}}
+\def\>{\texttt{~~~~}}
+
+\def\*{$\color{gray}\triangleright$ \ignorespaces}
+\def\+{$\phantom{\triangleright}$ \ignorespaces}
+\def\({\leavevmode{\setbox0\hbox{(}\hbox to \wd0{\hfil}}\ignorespaces}
+
+\begin{document}
+
+\begin{frame}[t]{}
+
+  %%
+  %% drawing grid
+  %%
+
+  %% \begin{textblock}{21}(0,0)
+  %%   \begin{tikzpicture}[yellow!70,yscale=-1]
+  %%     \draw[densely dotted] (0,0) grid (21,30);
+  %%     \foreach \x in {1,...,20} {
+  %%       \node at (\x,.5) {\x};
+  %%       }
+  %%     \foreach \y in {1,...,29} {
+  %%       \node at (.5,\y) {\y};
+  %%       }
+  %%   \end{tikzpicture}
+  %% \end{textblock}
+
+  %%
+  %% title & logos
+  %%
+
+  \begin{textblock}{19}(1,.7)
+    \begin{center}
+      \Huge\textbf{ABCD cheatsheet}
+    \end{center}
+  \end{textblock}
+
+  \begin{textblock}{1.5}(1,27.5)
+    \begin{tikzpicture}
+      \node[inner sep=0pt] (snk) {\includegraphics[width=15mm]{logo-snakes}};
+      \node[anchor=west,text width=6cm] at (snk.east)
+           {\tiny\color{gray}%
+            \copyright~2018 Franck Pommereau\\[4pt]
+            \href{mailto:franck.pommerau@univ-evry.fr}%
+                 {franck.pommerau@univ-evry.fr}\\[-4pt]
+            \href{https://snakes.ibisc.univ-evry.fr}%
+                 {snakes.ibisc.univ-evry.fr}};
+    \end{tikzpicture}
+  \end{textblock}
+
+  %%
+  %% command line interface
+  %%
+
+  \begin{textblock}{12}(1,2.7)
+    \advance\baselineskip by 14pt
+    \advance\parskip by 7pt
+
+    \noindent
+    \tikz\node[shell,text width=\textwidth-10pt] {\texttt{\$ abcd
+        {\color{red!50!black}[option]\dots}
+        {\color{green!50!black}spec.abcd}\strut}};
+
+    \shell{--pnml=FILE} save net as PNML \remark{SNAKES' variant}
+
+    \shell{--dot=FILE}
+    \shell{--neato=FILE}
+    \shell{--towpi=FILE}
+    \shell{--circo=FILE}
+    \shell{--fdp=FILE} draw net using a GraphViz engine
+
+    \shell{--load=PLUGIN} load a plugin before to build net
+    \remark{may be repeated}
+
+    \shell{--simul} start interactive simulator
+  \end{textblock}
+
+  %%
+  %% source structure
+  %%
+
+  \begin{textblock}{5}(15,2.7)
+    \begin{tikzpicture}[xscale=.8,yscale=-1]
+      \node[anchor=base west] at (.2,.8) {\abcdC{a comment}};
+      \node[anchor=base west] at (.2,1.3) {\abcdC{another comment}};
+      \path[fill=red,opacity=.1] (0,1.5) rectangle (6,4);
+      \node at (3,2.7) {\color{red!50!black}declarations};
+      \path[fill=green,opacity=.1] (0,4) rectangle (6,6);
+      \node at (3,5) {\color{green!50!black}process};
+      \draw[color=gray!70,line width=2pt,rounded corners] (0,0) -- (5,0) -- (6,1) -- (6,6) -- (0,6) -- cycle;
+      \draw[color=gray!70,line width=2pt,rounded corners,cap=round,shorten <=2pt,shorten >=2pt] (5,0) |- (6,1);
+    \end{tikzpicture}
+  \end{textblock}
+
+  %%
+  %% declarations
+  %%
+
+  \begin{textblock}{6}(1,11)
+    \textbf{buffer declarations:}
+
+    \abcdK{buffer} \NT{name}\abcdK{:} \NT{type} \abcdK{= ()}\\
+    \* empty buffer
+
+    \abcdK{buffer} \NT{name}\abcdK{:} \NT{type} \abcdK{=} \NT{val}\abcdK{,} \NT{\dots}\\
+    \* buffer with initial content
+
+    \vspace*{5pt}
+    \textbf{type expressions:}
+
+    any Python type or class\\
+    \* eg, \abcdR{int}, \abcdR{str}, \abcdR{object}, \dots,\\
+    \+ or user-defined classes
+
+    \abcdK{enum(}\NT{val}\abcdK{,} \NT{val}\abcdK{,} \NT{\dots}\abcdK{)}\\
+    \* enumerated type
+
+    \NT{type} \abcdK{*} \NT{type}\\
+    \* cross-product of types
+
+    \NT{type} \abcdK{|} \NT{type}\\
+    \* union of types
+
+    \NT{type} \abcdK{\&} \NT{type}\\
+    \* intersection of types
+
+    \vspace*{5pt}
+    \textbf{types definition:}$^\star$
+
+    \abcdK{typedef} \NT{name}\abcdK{:} \NT{type}\\
+
+    \vspace*{5pt}
+    \textbf{constants:}$^\star$
+
+    \abcdK{const} \NT{name} \abcdK{=} \NT{expr}
+
+    \vspace*{5pt}
+    \textbf{symbols:}$^\star$
+
+    \abcdK{symbol} \NT{name}\abcdK{,} \NT{\dots}\\
+    \* define fresh unique values
+
+    \vspace*{5pt}
+    \textbf{Python imports:}$^\star$
+
+    \* just use regular Python imports
+
+    \vspace*{5pt}
+    \tikz[remember picture]\node[inner sep=0pt](call) {\textbf{sub-processes}};
+
+    \vspace*{5pt}
+    \minor{$\star$ global declarations only}
+  \end{textblock}
+
+  %%
+  %% atomic actions
+  %%
+
+  \begin{textblock}{6}(14,9.9)
+    \textbf{atomic actions:}
+
+    \abcdA{\abcdR{True}}\\
+    \* no-op non-blocking action
+
+    \abcdA{\abcdR{False}}\\
+    \* always-blocking action
+
+    \abcdA{\NT{accesses}}\\
+    \* unguarded action
+
+    \abcdA{\NT{accesses} \abcdK{if} \NT{expr}}\\
+    \* guarded action
+
+    \vspace*{5pt}
+    \textbf{accesses:}
+
+    \abcdN{buff}\abcdK{-(}\NT{val}\abcdK{)}\\
+    \* consume \NT{val} from \abcdN{buff}
+
+    \abcdN{buff}\abcdK{-(}\NT{var}\abcdK{)}\\
+    \* consume a value from \abcdN{buff}\\
+    \+ and binds it to \NT{var}
+
+    \abcdN{buff}\abcdK{+(}\NT{expr}\abcdK{)}\\
+    \* produce a value into \abcdN{buff}
+
+    \abcdN{buff}\abcdK{?(}\NT{val}\abcdK{)}\\
+    \* test for \NT{val} in \abcdN{buff}
+
+    \abcdN{buff}\abcdK{?(}\NT{var}\abcdK{)}\\
+    \* test for a value in \abcdN{buff}\\
+    \+ and binds it to \NT{var}
+
+    \abcdN{buff}\abcdK{>>(}\NT{var}\abcdK{)}\\
+    \* flush \abcdN{buff} into \NT{var}
+
+    \abcdN{buff}\abcdK{<<(}\NT{var}\abcdK{)}\\
+    \* add the values contained in\\
+    \+ \NT{var} to \abcdN{buff}
+
+    \abcdN{buff}\abcdK{<>(}\NT{val}\abcdK{=}\NT{expr}\abcdK{)}\\
+    \* replace \NT{val} in \abcdN{buff}\\
+    \+ with \NT{expr}
+
+    \abcdN{buff}\abcdK{<>(}\NT{var}\abcdK{=}\NT{expr}\abcdK{)}\\
+    \* replace \NT{var} in \abcdN{buff}\\
+    \+ with \NT{expr}
+
+    \vspace*{5pt}
+    \remark{a comma-separated list of accesses\\[-2pt]
+      \( is performed atomically}
+  \end{textblock}
+
+  %%
+  %% control flow
+  %%
+
+  \begin{textblock}{5}(8,11.7)
+    \textbf{control flow:}
+
+    \NT{process} \abcdK{;} \NT{process}\\
+    \* sequential composition
+
+    \NT{process} \abcdK{*} \NT{process}\\
+    \* non-deterministic choice\\
+    \+ \remark{use opposite guards to\\[-2pt]
+      \+\( make it deterministic}
+
+    \NT{process} \abcdK{*} \NT{process}\\
+    \* iterate left-hand-side and\\
+    \+ exit with right-hand-side
+
+    \NT{process} \abcdK{|} \NT{process}\\
+    \* parallel composition
+
+    \vspace*{5pt}
+    \remark{no priorities $\Rightarrow$ use parentheses}
+
+    \vspace*{5pt}
+    \textbf{sub-process instances:}
+
+    \NT{name}\abcdK{(}\NT{args}\abcdK{)}\\
+    \* substitute \NT{args} in net \NT{name}\\
+    \+ scope its local buffers\\
+    \+ insert the net
+
+    \tikz\draw[guide,dashed,dash pattern=on 12pt off 6pt](0,0) -- (5,0);
+
+    \vspace*{5pt}
+    \leavevmode\hbox to 0pt{\tikz[remember picture]\node[inner sep=3pt](suite){};\hss}%
+    \textbf{sub-process declarations:}
+
+    \abcdK{net} \NT{name} \abcdK{(}\NT{params}\abcdK{):}\\[-4pt]
+    \begin{tikzpicture}[yscale=-1]
+      \node[fill=red,opacity=.1,text opacity=1,minimum width=4cm,minimum height=1cm]
+        at (2.6,0) {\color{red!50!black}declarations};
+      \node[fill=green,opacity=.1,text opacity=1,minimum width=4cm,minimum height=1cm]
+        at (2.6,1) {\color{green!50!black}process};
+      \node[rotate=90,text width=2cm,text centered,opacity=.3] at (0,.5) {\small indented\\[-5pt] block};
+    \end{tikzpicture}
+
+    \vspace*{5pt}
+    \textbf{sub-process parameters:}
+
+    \NT{name}\\
+    \* a value is expected
+
+    \NT{name}\abcdK{: buffer}\\
+    \* a buffer name is expected
+
+  \end{textblock}
+
+  %%
+  %% guide lines
+  %%
+
+  \begin{textblock}{21}(0,-.3)
+    \begin{tikzpicture}[overlay,remember picture,yscale=-1]
+      \draw[guide,->] (3.6,3.8) -- +(0,.7);
+      \draw[guide,->] (6.7,3.8) |- +(8.35,.6);
+      \draw[guide,->] (16.2,5.8) -| (14,9) -- (10,10.5) -| (3,11.2);
+      \draw[guide,->] (17.5,8.3) |- (15.5,9.5) -- (15.5,10.2);
+      \draw[guide,->] (16,9.5) -- (14,9.5) -- (9.5,11.2) -- (9.5,11.9);
+      \draw[guide,->,shorten >=3pt,shorten <=3pt] (call) -| (7.5,25) |- (suite);
+    \end{tikzpicture}
+  \end{textblock}
+
+\end{frame}
+\end{document}

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+113.602 5.234 m f
+Q Q
+showpage
+%%Trailer
+count op_count sub {pop} repeat
+countdictstack dict_count sub {end} repeat
+cairo_eps_state restore
+%%EOF

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+\documentclass{beamer}
+
+\usepackage[english]{babel}
+\usepackage[latin1]{inputenc}
+\usepackage[orientation=portrait,size=a0,scale=2]{beamerposter}
+\usepackage{textpos}
+\usepackage{picins}
+\usepackage{url}
+\usepackage{fancyvrb}
+\usepackage{relsize}
+
+\usepackage{tikz}
+\usetikzlibrary{shapes.callouts}
+
+\parindent=0pt
+\setbeamertemplate{navigation symbols}{}
+
+\def\smallskip{\vspace{5mm}}
+\def\medskip{\vspace{10mm}}
+\def\bigskip{\vspace{20mm}}
+
+\colorlet{title}{black!10}
+\colorlet{minor}{black!65}
+\colorlet{snakes}{green!30!black}
+\colorlet{python}{blue!30!black}
+\definecolor{popup}{rgb}{.6,1,.5}
+
+\def\*{\raise-.65ex\hbox{$\smash{
+      \includegraphics[height=1em]{snake-shadow.pdf}}$}}
+
+\def\section#1{\noindent\colorbox{title}{%
+    \hbox to \textwidth{\bfseries #1\hfill\strut\*}}\smallskip}
+
+\def\endparitem{\endgraf\egroup}
+\def\>{\par\bgroup
+  \let\par=\endparitem
+  \leftskip=1.4em\parindent=-1.4em
+  \indent\hbox to 1.4em{\hss
+    $\smash{\includegraphics[width=1em]{cartoon-python.pdf}}$
+  }\ignorespaces}
+\def\+{\par\bgroup
+  \let\par=\endparitem
+  \leftskip=2.8em\parindent=-1.4em
+  \indent\hbox to 1.4em{\hss
+    $\color{snakes}\smash{\bullet}$
+  }\ignorespaces}
+
+\def\PYk #1{{\color{snakes}#1}}
+\def\PYn #1{{\color{python}#1}}
+\def\PYc #1{{\color{minor}#1}}
+
+\begin{document}
+\begin{frame}[fragile]{}
+
+%%
+%% title & logos
+%%
+
+\begin{textblock}{14.4}(.5,.5)
+  \parpic{\includegraphics[height=13cm]{logo-snakes}\quad}
+  {\Large\bfseries a high-level Petri nets library}\\[15pt]
+  {\large Franck Pommereau}\\[30pt]
+  \small
+  IBISC/COSMO, university of vry/Paris-Saclay\\
+  23 boulevard de France, 91037 vry Cedex France\\[20pt]
+  \url{franck.pommereau@ibisc.univ-evry.fr}\\
+  \url{http://www.ibisc.univ-evry.fr/~fpommereau/SNAKES/}
+\end{textblock}
+
+\begin{textblock}{14.4}(.7,.5)
+  \null\hfill
+  \begin{tikzpicture}[xscale=4,yscale=4]
+    \node at (-2,0) {\includegraphics[width=150mm, height=150mm,
+      keepaspectratio=true]{logo-ibisc}};
+    \node at (1,1) {\includegraphics[width=58mm, height=58mm,
+      keepaspectratio=true]{logo-ueve}};
+    \node at (1,-1) {\includegraphics[width=65mm, height=65mm,
+      keepaspectratio=true]{logo-genopole}};
+  \end{tikzpicture}
+\end{textblock}
+
+%%
+%% left column
+%%
+
+\begin{textblock}{9}(.5,2.85)
+\section{SNAKES in a nutshell}
+
+\tikzstyle{popup}=[draw,rectangle callout,rounded corners=15,
+  text width=10cm,align=center,callout pointer width=7mm,
+  callout absolute pointer={(70:.5)},fill=popup]
+
+\begin{center}
+\begin{tikzpicture}[scale=12]
+  \node at (0,0) {\scalebox{-1}[1]{%
+      \includegraphics[scale=3]{oroborus.pdf}}};
+  \node[popup,callout relative pointer={(-70:2)}] at (90:1)
+    {SNAKES is a Python library};
+  \node[popup,callout relative pointer={(-150:2)}] at (40:1.4)
+    {Define and manipulate Petri nets};
+  \node[popup,callout relative pointer={(170:3)}] at (10:1.3)
+    {Very generic Petri net definition};
+  \node[popup,callout relative pointer={(150:4)}] at (-25:1.3)
+    {Annotations are Python expressions};
+  \node[popup,callout relative pointer={(80:4)}] at (-90:1)
+    {Tokens are Python objects};
+  \node[popup,cloud callout,cloud puffs=15,aspect=2.5,inner sep=-20pt,
+    cloud puff arc=120,callout relative pointer={(170:3)},
+    fill=blue!20,rounded corners=0] at (-45:1.7)
+    {\small Even SNAKES'\\[-20pt] net objects};
+  \node[popup,callout relative pointer={(50:4.5)}] at (-150:1.2)
+    {Fully reflexive for maximal flexibility};
+  \node[popup,cloud callout,cloud puffs=12,aspect=2.6,inner sep=-50pt,
+    cloud puff arc=140,callout relative pointer={(50:2)},
+    fill=blue!20,rounded corners=0] at (-130:1.5)
+    {\small Inspired\\[-20pt] by Emacs};
+  \node[popup,callout relative pointer={(10:3)}] at (170:1.2)
+    {Extensible with plugins};
+  \node at (0,0) {\includegraphics[scale=.5]{python-powered.pdf}};
+\end{tikzpicture}
+\end{center}
+
+%%
+%%
+%%
+
+\medskip
+\section{Plugins}
+
+\> {\color{snakes}\texttt{gv}}: draw Petri nets using GraphViz
+\> {\color{snakes}\texttt{ops}}: algebras of Petri nets compositions 
+   {\small\color{minor}(PBC, PNA, M-nets, \dots)} 
+\> {\color{snakes}\texttt{pids}}: dynamic processes creation and
+   destruction
+\> {\color{snakes}\texttt{labels}}: arbitrary objects annotations
+\> {\color{snakes}\texttt{let}}: variables assignation during computation 
+\> \dots {\color{minor}(your plugin here: try, it's easy)}
+
+%%
+%%
+%%
+
+\bigskip
+\section{ABCD for friendly modelling}
+
+\> process algebra with friendly Python-like syntax
+\> embeds full Python
+\> compiler shipped with SNAKES library
+\> generates Petri nets objects
+\> export to pictures or PNML files
+\> simulation and reachability analysis
+
+\vbox to 0pt{\vss\null\hfill
+  \includegraphics[width=18cm]{abcd-simul}
+  \vspace*{.2\baselineskip}}
+\vspace*{-\baselineskip}
+
+%%
+%%
+%%
+
+\bigskip
+\section{Neco for fast analysis}
+
+\> \L ukasz Fronc's companion tool {\small\color{minor}(available
+  separately at \url{https://code.google.com/p/neco-net-compiler/})}
+\> Neco compiles SNAKES Petri nets into fast native code
+  \+ optimised marking structure
+  \+ per-transition optimised firing
+\> reads PNML, ABCD, or net objects
+\> process-symmetries reductions
+\> state space exploration and LTL model-checking
+   {\small\color{minor}(using SPOT)}
+\> awarded at the \emph{model-checking contest\/} 2013
+  {\small\color{minor}(PETRI NETS conf.)}
+
+\vbox to 0pt{\vss\null\hfill
+  \begin{tikzpicture}
+    \node[inner sep=0pt] (neco) {\includegraphics[width=18cm]{neco.pdf}};
+    \node[below=-6pt] at (neco.south) {\scalebox{2.1}[1]{net
+        compiler\hskip 9pt\null}};
+  \end{tikzpicture}\hspace*{-12mm}
+  \vspace*{2.8\baselineskip}}
+
+%%
+%%
+%%
+
+\end{textblock}
+
+%%
+%% right column
+%%
+
+\def\section#1{\noindent{\bfseries #1}\smallskip}
+
+\begin{textblock}{5}(10,2.85)
+  \begin{tikzpicture}
+    \path[fill=title] (0,0) rectangle (40,100);
+  \end{tikzpicture}
+\end{textblock}
+
+\begin{textblock}{5}(10.2,3)
+
+%%
+%%
+%%
+
+\section{About SNAKES}
+
+\> free \& open source {\small (GNU LGPL)}
+\> works out of the box
+\> 81.5k lines of portable Python
+\> maintained for 10\texttt{+} years
+\> one permanent developer/user
+\> online documentation has\qquad 300\texttt{+} visitors per month
+
+%%
+%%
+%%
+
+\bigskip
+\section{SNAKES  vs GitHub's top 10 Python projects$^*$
+  {\color{minor}\small(on Nov. 2013)}}
+
+\vskip -1ex
+\begin{tikzpicture}[xscale=3.4,yscale=-2.5]
+\tikzstyle{project}=[left,anchor=base east,inner sep=0pt]
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+\tikzstyle{price}=[right,anchor=base west]
+\node[project] at (0,1) {\small django\;};
+\node[bar,text width=530] at (0,1) {\small\strut};
+\node[price,anchor=base east] at (bar.base east)
+  {\raise -.1ex\hbox{\small\$5.3M (432)}};
+\node[project] at (0,2) {\small\color{snakes}snakes\;};
+\node[bar,text width=270] at (0,2) {\small\strut};
+\begin{scope}[color=snakes]
+  \draw[clip] (bar.north west) rectangle (bar.south east)
+    node at (bar.center) {\includegraphics[scale=.2]{python-skin}};
+\end{scope}
+\node[price] at (bar.base east) {\small\$2.7M (2)};
+\node[project] at (0,3) {\small sick-beard\;};
+\node[bar,text width=260] at (0,3) {\small\strut};
+\node[price] at (bar.base east) {\small\$2.6M (110)};
+\node[project] at (0,4) {\small ipython\;};
+\node[bar,text width=230] at (0,4) {\small\strut};
+\node[price] at (bar.base east) {\small\$2.3M (236)};
+\node[project] at (0,5) {\small boto\;};
+\node[bar,text width=210] at (0,5) {\small\strut};
+\node[price] at (bar.base east) {\small\$2.1M (314)};
+\node[project] at (0,6) {\small reddit\;};
+\node[bar,text width=150] at (0,6) {\small\strut};
+\node[price] at (bar.base east) {\small\$1.5M (87)};
+\node[project] at (0,7) {\small sentry\;};
+\node[bar,text width=130] at (0,7) {\small\strut};
+\node[price] at (bar.base east) {\small\$1.3M (166)};
+\node[project] at (0,8) {\small tornado\;};
+\node[bar,text width=60] at (0,8) {\small\strut};
+\node[price] at (bar.base east) {\small\$0.6M (120)};
+\node[project] at (0,9) {\small requests\;};
+\node[bar,text width=30] at (0,9) {\small\strut};
+\node[price] at (bar.base east) {\small\$0.3M (275)};
+\node[project] at (0,10) {\small flask\;};
+\node[bar,text width=20] at (0,10) {\small\strut};
+\node[price] at (bar.base east) {\small\$0.2M (159)};
+\node[project] at (0,11) {\small httpie\;};
+\node[bar,text width=10] at (0,11) {\small\strut};
+\node[price] at (bar.base east) {\small\$0.1M (22)};
+\end{tikzpicture}
+
+estimated cost to develop {\color{minor}\small(generated using David A.
+  Wheeler's ``SLOCCount'')} and number of contributors
+  
+\hbox to \textwidth{\null\hfill\color{minor}\small $^*$ 10 most forked
+  or followed Python projects}
+
+%%
+%%
+%%
+
+\bigskip
+\section{Using SNAKES out of Python}
+
+\> write a binding in Cython
+
+\begin{Verbatim}[commandchars=\\\{\},fontsize=\small,xleftmargin=1.4em,
+  numbers=left,numbersep=30pt]
+\PYc{# this is Cython code}
+\PYk{cdef} \PYk{public} \PYk{int} \PYn{foo} (...):
+    \PYc{# Python with SNAKES here}
+\end{Verbatim}
+
+\> Cython compiles to C/C\texttt{++} \qquad with a \texttt{.h} file:
+
+\begin{Verbatim}[commandchars=\\\{\},fontsize=\small,xleftmargin=1.4em,
+  numbers=left,numbersep=30pt]
+\PYc{// this is C/C++ code}
+\PYk{extern} \PYk{int} \PYn{foo}(...);
+\end{Verbatim}
+
+\> use this API in your project
+
+%%
+%%
+%%
+
+\bigskip
+\section{Isn't Python slow?}
+
+\> {\color{snakes}no} for handling nets {\small\color{minor}even large
+   ones}
+\> {\color{red!30!black}yes} for firing transitions
+\> \raise -.1ex\hbox{\includegraphics[height=.9em]{neco.pdf}} is fast
+   at that! {;-)}
+
+%%
+%%
+%%
+
+\end{textblock}
+
+%%
+%% flush top
+%%
+
+\vspace*{150cm}
+\end{frame}
+\end{document}
\ No newline at end of file