Also forbid protected

chapters/classes.tex

@@ -745,7 +745,7 @@ \subsection{Short Class Definitions}\label{short-class-definitions}
 
 \subsection{Combining Base Classes and Other Elements}\label{restriction-on-combining-base-classes-and-other-elements}\label{combining-base-classes-and-other-elements}
 
-It is not legal to combine equations, algorithms, components, or base classes with an extends from an array class, a class with non-empty \lstinline[language=grammar]!base-prefix!, a \firstuse{simple type} (\lstinline!Real!, \lstinline!Boolean!, \lstinline!Integer!, \lstinline!String! and enumeration types), or any class transitively extending from an array class, a class with non-empty \lstinline[language=grammar]!base-prefix!, or a simple type.
+It is not legal to combine equations, algorithms, components, base classes, or protected elements with an extends from an array class, a class with non-empty \lstinline[language=grammar]!base-prefix!, a \firstuse{simple type} (\lstinline!Real!, \lstinline!Boolean!, \lstinline!Integer!, \lstinline!String! and enumeration types), or any class transitively extending from an array class, a class with non-empty \lstinline[language=grammar]!base-prefix!, or a simple type.
 
 \begin{example}
 \begin{lstlisting}[language=modelica]