Minimal Sample for Custom Workflow Style

\documentclass{article}
%
% hier zunächst die benötigten packages
\usepackage{color}
\usepackage{listings}

\definecolor{lightgray}{rgb}{.9,.9,.9}
\definecolor{darkgray}{rgb}{.4,.4,.4}
\definecolor{forestGreen}{RGB}{34,139,34}
\definecolor{orangeRed}{RGB}{255,69,0}

\lstdefinelanguage{bpel}{
morekeywords={name,linkName,isolated,parallel,partnerLink,operation,portType,inputVariable,createInstance,
variable,element,location,importType,partnerLinkType,myRole,messageType,properties,level,outputVariable,
xmlns,version,encoding}
}
\lstdefinelanguage{xaml}{
morekeywords={TypeArguments,Name,Default,DisplayName,OperationName,ServiceContractName,Key,AddressUri,
CanCreateInstance, LogName, Message, MessageNumber, Expression,CorrelationHandle,Request}
}

\lstdefinelanguage{xml}{
    basicstyle=\small,
    sensitive=false,
}

\lstdefinestyle{workflowStyle}{
language=XML,
alsolanguage=bpel,
alsolanguage=xaml,
%Formatting
basicstyle=\scriptsize,
sensitive=true,
showstringspaces=false,
numbers=left,
numberstyle=\tiny,
tabsize=4,
numbersep=3pt,
extendedchars=true,
xleftmargin=2em,
lineskip=1pt,
breaklines,
captionpos=t,
%Coloring
backgroundcolor=\color{lightgray},
morekeywords={BooleanExpression},
alsoletter={:,<,>,/,?},
morestring=[b]{"},
morecomment=[s]{<!--}{-->},keywordstyle=\color{forestGreen},
identifierstyle=\color{blue}\ttfamily,
stringstyle=\color{orangeRed}\ttfamily,
commentstyle=\color{forestGreen}\ttfamily
}


\lstnewenvironment{workflow-code}[2]{
\lstset{caption=#1,label=#2,style=workflowStyle}
}{}

\begin{document}

\begin{workflow-code}{caption}{label}
<assign name ="LogActivity">
    <trace>
        <log level="info" location="onComplete">
            <from variable="logMessage"/>
        </log>
    </trace>
    <!--copy a meaningful message to variable logMessage-->
</assign>
\end{workflow-code}

\end{document}