Jürgen Spitzmüller schrieb:
What you could do is the following:\usepackage{ifthen} % used for tables with dashed lines \newboolean{arydshln} \IfFileExists{arydshln}{% \usepackage{arydshln} \setboolean{arydshln}{true} }{\setboolean{arydshln}{false}} and then wrap section 2.12.5 into \ifarydshln ...
This seems to be a smart solution. I'll have a closer look and implement this. Thanks for the hint, I wasn't aware that there is a \setboolean command.
best regards Uwe