Nomenclature with Sections

[Wolfgang Engelmann]

I would like to have parts of the nomenclature as a separate section, 
namely Abbreviations and Mathematical Symbols (see ##>> below).
I found this in the net, but don't know how to realize it so that both 
appear in the pdf output printed as sections.

%usepackage{ifthen}
%Creating Nomenclature with Sections
%\renewcommand{\nomname}{Glossary}

%\renewcommand{\nomgroup}[1]{%
%\ifthenelse{\equal{#1}{A}}{\item[\textbf{Roman Symbols}]}{%
%\ifthenelse{\equal{#1}{G}}{\item[\textbf{Greek Symbols}]}{%
##>>%\ifthenelse{\equal{#1}{C}}{\item[\textbf{Abbreviations}]}{%
%\ifthenelse{\equal{#1}{S}}{\item[\textbf{Subscripts}]}{%
##>>%\ifthenelse{\equal{#1}{Z}}{\item[\textbf{Mathematical Symbols}]}
%{}
%}% matches mathematical symbols
%}% matches Subscripts
%}% matches Abbreviations
%}% matches Greek Symbols
%}% matches Roman Symbols

%\def\nompreamble{\addcontentsline{toc}{section}{\nomname}\markboth{\nomname}{\nomname}}

Wolfgang