% Requirements table
\newenvironment{reqtable}{
	\begin{tabular}{| p{0.05\linewidth} | p{0.35\linewidth} | p{0.5\linewidth} |}
        \hline
        \rowcolor{zcgray}
	\textbf{Nr.} & \textbf{Anforderung} & \textbf{Erläuterung}\\ \hline
}{
	\hline
	\end{tabular}
}

% table listing keys with values/descriptions
% parameters:
% 1 - the column name of the key
% 2 - the column name of the description/value 
\newenvironment{keyvaluetable}[2]{
	\begin{tabular}{| p{0.25\linewidth} | p{0.75\linewidth} |}
        \hline
        \rowcolor{zcgray}
	\textbf{#1} & \textbf{#2}\\ \hline
}{
	\hline
\end{tabular}
}