Refine index entries.

chapters/classes.tex

@@ -337,23 +337,23 @@ \subsection{Acyclic Bindings of Constants and Parameters}\label{acyclic-bindings
 
 \subsection{Component Variability Prefixes discrete, parameter, constant}\label{component-variability-prefixes-discrete-parameter-constant}
 
-The prefixes \lstinline!discrete!, \lstinline!parameter!, \lstinline!constant! of a component declaration are called \firstuse{variability prefixes}\index{variability!prefix}\index{declared variability}\index{variability!declared|see{declared variability}} and define in which situation the variable values of a component are initialized (see \cref{events-and-synchronization} and \cref{initialization-initial-equation-and-initial-algorithm}) and when they are changed in transient analysis (= solution of initial value problem of the hybrid DAE):
+The prefixes \lstinline!discrete!, \lstinline!parameter!, \lstinline!constant! of a component declaration are called \firstuse{variability prefixes}\index{variability!prefix}\index{component variability}\index{declared variability}\index{variability!declared|see{declared variability}} and define in which situation the variable values of a component are initialized (see \cref{events-and-synchronization} and \cref{initialization-initial-equation-and-initial-algorithm}) and when they are changed in transient analysis (= solution of initial value problem of the hybrid DAE):
 \begin{itemize}
 \item
   A variable \lstinline!vc! declared with \lstinline!constant!\indexinline{constant} prefix remains constant during transient analysis, with a value that is unaffected by the initialization problem.
-  This is called a \firstuse{constant}, or \firstuse{constant variable}\index{constant variable}\index{component variability!constant}.
+  This is called a \firstuse{constant}, or \firstuse{constant!variable}\index{constant!variable}\index{component variability!constant}.
 \item
   A variable \lstinline!vc! declared with the \lstinline!parameter!\indexinline{parameter} prefix remains constant during transient analysis, with a value determined by the initialization problem.
-  This is called a \firstuse{parameter}, or \firstuse{parameter variable}\index{parameter variable}\index{component variability!parameter}.
+  This is called a \firstuse{parameter}, or \firstuse{parameter!variable}\index{parameter!variable}\index{component variability!parameter}.
 \item
-  A \emph{discrete-time} variable \lstinline!vd! is a variable that is discrete-valued (that is, not of \lstinline!Real! type) or assigned in a \lstinline!when!-clause.
+  A \emph{discrete-time}\index{discrete-time!variable}\index{component variability!discrete-time} variable \lstinline!vd! is a variable that is discrete-valued (that is, not of \lstinline!Real! type) or assigned in a \lstinline!when!-clause.
   The \lstinline!discrete!\indexinline{discrete} prefix may be used to clarify that a variable is discrete-time.
   It has a vanishing time derivative between events.
   Note that this is not the same as saying that \lstinline!der(vd)=0! almost everywhere, as the derivative is not even defined at the events.
   It is not allowed to apply \lstinline!der! to discrete-time variables.
   During transient analysis the variable can only change its value at event instants (see \cref{events-and-synchronization}).
 \item
-  A \emph{continuous-time} variable is a \lstinline!Real! variable without any prefix that is not assigned in a \lstinline!when!-clause.
+  A \emph{continuous-time}\index{continuous-time!variable}\index{component variability!continuous-time} variable is a \lstinline!Real! variable without any prefix that is not assigned in a \lstinline!when!-clause.
   A continuous-time variable \lstinline!vn! may have a non-vanishing time derivative (\lstinline!der(vn)<>0! possible) and may also change its value discontinuously at any time during transient analysis (see \cref{events-and-synchronization}).
   If there are any discontinuities the variable is not differentiable.
 \end{itemize}

chapters/operatorsandexpressions.tex

@@ -1386,7 +1386,7 @@ \section{Variability of Expressions}\label{variability-of-expressions}
 
 \subsection{Constant Expressions}\label{constant-expressions}
 
-Constant expressions\index{constant expression}\index{expression variability!constant} are:
+Constant expressions\index{constant!expression}\index{expression variability!constant} are:
 \begin{itemize}
 \item
   \lstinline!Real!, \lstinline!Integer!, \lstinline!Boolean!, \lstinline!String!, and \lstinline!enumeration! literals.
@@ -1407,7 +1407,7 @@ \subsection{Constant Expressions}\label{constant-expressions}
 
 \subsection{Parameter Expressions}\label{parameter-expressions}
 
-Parameter expressions\index{parameter expression}\index{expression variability!parameter}\index{parametric variability|see{parameter expression}} are:
+Parameter expressions\index{parameter!expression}\index{expression variability!parameter}\index{parametric variability|see{parameter, expression}} are:
 \begin{itemize}
 \item
   Constant expressions.
@@ -1437,7 +1437,7 @@ \subsection{Parameter Expressions}\label{parameter-expressions}
 
 \subsection{Discrete-Time Expressions}\label{discrete-time-expressions}
 
-Discrete-time expressions\index{discrete-time expression}\index{expression variability!discrete-time} are:
+Discrete-time expressions\index{discrete-time!expression}\index{expression variability!discrete-time} are:
 \begin{itemize}
 \item
   Parameter expressions.