+\newenvironment{xlist}[1][\rule{0em}{0em}]{%
+ \begin{list}{}{%
+ \settowidth{\labelwidth}{#1:}
+ \setlength{\labelsep}{0.5cm}
+ \setlength{\leftmargin}{\labelwidth}
+ \addtolength{\leftmargin}{\labelsep}
+ \setlength{\rightmargin}{0pt}
+ \setlength{\parsep}{0.5ex plus 0.2ex minus 0.1ex}
+ \setlength{\itemsep}{0 ex plus 0.2ex}
+ \renewcommand{\makelabel}[1]{##1:\hfil}
+ }
+ }
+{\end{list}}
+