\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{tikz}
\usepackage[T1]{fontenc}
%\usepackage{fontspec}
% http://www.texample.net/tikz/examples/diagram-chains/
\usetikzlibrary{%
arrows,%
calc,
shapes,
arrows,
shapes.misc,% wg. rounded rectangle
shapes.arrows,%
chains,%
matrix,%
positioning,% wg. " of "
scopes,%
decorations.pathmorphing,% /pgf/decoration/random steps | erste Graphik
shadows%
}
\usepackage{amsmath}
\usepackage{relsize}
\begin{document}
\input{uml2-activity-diagram}
\input{block-diagram}
\end{document}
