Define time as keyword.

chapters/lexicalstructure.tex

@@ -117,18 +117,18 @@ \subsection{Modelica Keywords}\label{modelica-keywords}
 The following Modelica \firstuse[keyword]{keywords} are reserved words that cannot be used where \lstinline[language=grammar]!IDENT! is expected in the language grammar (\cref{modelica-concrete-syntax}):
 \begin{center}
 \begin{tabular}{l l l l l}
-{\lstinline!algorithm!} & {\lstinline!discrete!} & {\lstinline!false!} & {\lstinline!loop!} & {\lstinline!pure!}\\ \hline
-{\lstinline!and!} & {\lstinline!each!} & {\lstinline!final!} & {\lstinline!model!} & {\lstinline!record!}\\ \hline
-{\lstinline!annotation!} & {\lstinline!else!} & {\lstinline!flow!} & {\lstinline!not!} & {\lstinline!redeclare!}\\ \hline
-& {\lstinline!elseif!} & {\lstinline!for!} & {\lstinline!operator!} & {\lstinline!replaceable!}\\ \hline
+{\lstinline!algorithm!} & {\lstinline!each!} & {\lstinline!final!} & {\lstinline!model!} & {\lstinline!record!}\\ \hline
+{\lstinline!and!} & {\lstinline!else!} & {\lstinline!flow!} & {\lstinline!not!} & {\lstinline!redeclare!}\\ \hline
+{\lstinline!annotation!} & {\lstinline!elseif!} & {\lstinline!for!} & {\lstinline!operator!} & {\lstinline!replaceable!}\\ \hline
 {\lstinline!block!} & {\lstinline!elsewhen!} & {\lstinline!function!} & {\lstinline!or!} & {\lstinline!return!}\\ \hline
 {\lstinline!break!} & {\lstinline!encapsulated!} & {\lstinline!if!} & {\lstinline!outer!} & {\lstinline!stream!}\\ \hline
 {\lstinline!class!} & {\lstinline!end!} & {\lstinline!import!} & {\lstinline!output!} & {\lstinline!then!}\\ \hline
-{\lstinline!connect!} & {\lstinline!enumeration!} & {\lstinline!impure!} & {\lstinline!package!} & {\lstinline!true!}\\ \hline
-{\lstinline!connector!} & {\lstinline!equation!} & {\lstinline!in!} & {\lstinline!parameter!} & {\lstinline!type!}\\ \hline
-{\lstinline!constant!} & {\lstinline!expandable!} & {\lstinline!initial!} & {\lstinline!partial!} & {\lstinline!when!}\\ \hline
-{\lstinline!constrainedby!} & {\lstinline!extends!} & {\lstinline!inner!} & {\lstinline!protected!} & {\lstinline!while!}\\ \hline
-{\lstinline!der!} & {\lstinline!external!} & {\lstinline!input!} & {\lstinline!public!} & {\lstinline!within!}\\
+{\lstinline!connect!} & {\lstinline!enumeration!} & {\lstinline!impure!} & {\lstinline!package!} & {\lstinline!time!}\\ \hline
+{\lstinline!connector!} & {\lstinline!equation!} & {\lstinline!in!} & {\lstinline!parameter!} & {\lstinline!true!}\\ \hline
+{\lstinline!constant!} & {\lstinline!expandable!} & {\lstinline!initial!} & {\lstinline!partial!} & {\lstinline!type!}\\ \hline
+{\lstinline!constrainedby!} & {\lstinline!extends!} & {\lstinline!inner!} & {\lstinline!protected!} & {\lstinline!when!}\\ \hline
+{\lstinline!der!} & {\lstinline!external!} & {\lstinline!input!} & {\lstinline!public!} & {\lstinline!while!}\\ \hline
+{\lstinline!discrete!} & {\lstinline!false!} & {\lstinline!loop!} & {\lstinline!pure!} & {\lstinline!within!}\\
 \end{tabular}
 \end{center}
 

chapters/operatorsandexpressions.tex

@@ -359,8 +359,8 @@ \subsection{Member Access Operator}\label{member-access-operator}
 
 \subsection{Built-in Variable time}\label{built-in-variable-time}\indexinline{time}
 
-All declared variables are functions of the independent variable \lstinline!time!.
-The variable \lstinline!time! is a built-in variable available in all models and blocks, which is treated as an input variable.
+All declared variables are functions of \lstinline!time!.
+The name \lstinline!time! is a keyword (see \cref{modelica-keywords}), and corresponds to a built-in variable available in all models and blocks, which is treated as an input variable.
 It is implicitly defined as:
 \begin{lstlisting}[language=modelica]
 input Real time (final quantity = "Time",

chapters/syntax.tex

@@ -411,6 +411,7 @@ \subsection{Expressions}\label{expressions1}
    | STRING
    | false
    | true
+   | time
    | ( component-reference | der | initial | pure ) function-call-args
    | component-reference
    | "(" output-expression-list ")" [ ( array-subscripts | "." IDENT ) ]
@@ -432,7 +433,8 @@ \subsection{Expressions}\label{expressions1}
 
 result-reference :
    component-reference
-   | der "(" component-reference [ "," UNSIGNED-INTEGER ] ")"
+   | time
+   | der "(" ( component-reference | time ) [ "," UNSIGNED-INTEGER ] ")"
 
 function-call-args :
    "(" [ function-arguments ] ")"

mlslistings.sty

@@ -53,7 +53,7 @@
 %   otherkeywords={-, =, +, [, ], (, ), \{, \}, :, *, !},%
     morekeywords=[1]{% Keywords not used to define code structure
         der,connect,assert,terminate,break,return,%
-        false,true,and,not,or,%
+        time,false,true,and,not,or,%
         final,each,%
         flow,stream,%
         input,output,%