\documentclass{scrartcl}
\usepackage{ifxetex}
\usepackage{ifluatex}
\ifxetex\else\ifluatex\else
\usepackage{selinput}\SelectInputMappings{adieresis={ä},germandbls={ß}}
\usepackage[T1]{fontenc}
\fi\fi
\usepackage{svg}
\usepackage{relsize}
\usepackage{hyperref}
