Sensible quoting.

chapters/packages.tex

@@ -145,15 +145,15 @@ \section{The Modelica Library Path -- MODELICAPATH}\label{the-modelica-library-p
 If during lookup a top-level name is not found in the unnamed top-level scope, the search continues in the package hierarchies stored in these directories.
 
 \begin{example}
-\Cref{fig:roots} below shows an example \lstinline!MODELICAPATH! = \filename{"C:\textbackslash{}library;C:\textbackslash{}lib1;C:\textbackslash{}lib2"}, with three directories containing the roots of the package hierarchies \lstinline!Modelica!, \lstinline!MyLib!, and \lstinline!ComplexNumbers!.
+\Cref{fig:roots} below shows an example \lstinline!MODELICAPATH! = \filename{C:\textbackslash{}library;C:\textbackslash{}lib1;C:\textbackslash{}lib2}, with three directories containing the roots of the package hierarchies \lstinline!Modelica!, \lstinline!MyLib!, and \lstinline!ComplexNumbers!.
 The first two are represented as the subdirectories \filename{C:\textbackslash{}library\textbackslash{}Modelica} and \filename{C:\textbackslash{}lib1\textbackslash{}MyLib}, whereas the third is stored as the file \filename{C:\textbackslash{}lib2\textbackslash{}ComplexNumbers.mo}.
 
 \begin{figure}[H]
   \begin{center}
     \includegraphics{modelicapath}
   \end{center}
   \caption{Roots of package hierarchies, e.g., \lstinline!Modelica!, \lstinline!MyLib!, and \lstinline!ComplexNumbers! in
-  \lstinline!MODELICAPATH! = \filename{"C:\textbackslash{}library;C:\textbackslash{}lib1;C:\textbackslash{}lib2"}.}
+  \lstinline!MODELICAPATH! = \filename{C:\textbackslash{}library;C:\textbackslash{}lib1;C:\textbackslash{}lib2}.}
   \label{fig:roots}
 \end{figure}
 
@@ -171,6 +171,8 @@ \section{The Modelica Library Path -- MODELICAPATH}\label{the-modelica-library-p
 This subdirectory must have a file \filename{package.mo} containing a definition of the package \lstinline!MyLib!, according to the Modelica rules on how to map a package hierarchy to the file system.
 The subpackage \lstinline!Pack2! is stored in its own subdirectory or file in the subdirectory \filename{MyLib}.
 In this case the search succeeds and the package \lstinline!MyLib.Pack2! is loaded into the environment.
+
+Note that if you use the environment variable \lstinline!MODELICAPATH! in Modelica the value is a string which implies that it is quoted, i.e., \lstinline!"C:\\library;C:\\lib1;C:\\lib2"!.
 \end{example}