doc/runtime.tex: Demote the object-system support stuff to a section.

There will be more sections later.

diff --git a/doc/runtime.tex b/doc/runtime.tex
index c1b009fdf9536fc2d9aece285b528c679b6138fa..8b8e080141eb08fc4d387f868a1c220bfa2bba72 100644 (file)
--- a/doc/runtime.tex
+++ b/doc/runtime.tex
@@ -25,17 +25,29 @@
 
 \chapter{The runtime library} \label{ch:runtime}
 
-This chapter describes the runtime support macros and functions defined in
-the @|<sod/sod.h>| header file.  The corresponding types are defined in
-\xref{ch:structures}.
+This chapter describes the runtime support macros and functions provided by
+the Sod library.  The common structure of object instances and classes is
+described in \xref{ch:structures}.
+
+%%%--------------------------------------------------------------------------
+\section{Object system support} \label{sec:runtime.object}
+
+This section describes the macros and functions exposed in the @|<sod/sod.h>|
+header file which provide assistance for working with Sod classes and
+objects.
 
 The runtime support functionality defined here generally expects that
 instances and classes inherit from the standard @|SodObject| root object.
 While the translator can (at some effort) support alternative roots, they
 will require different run-time support machinery.
 
-%%%--------------------------------------------------------------------------
-\section{Infrastructure macros} \label{ch:runtime.infra}
+
+\subsection{Infrastructure macros} \label{ch:runtime.object.infra}
+
+The runtime support functionality defined here generally expects that
+instances and classes inherit from the standard @|SodObject| root object.
+While the translator can (at some effort) support alternative roots, they
+will require different run-time support machinery.
 
 These macros are mostly intended for use in code generated by the Sod
 translator.  Others may find them useful for special effects, but they can be
@@ -87,8 +99,8 @@ general use.
   @|SOD_INSTBASE| macro (described below) is more suited to general use.
 \end{describe}
 
-%%%--------------------------------------------------------------------------
-\section{Utility macros} \label{sec:runtime.utility}
+
+\subsection{Utility macros} \label{sec:runtime.object.utility}
 
 The following macros are expected to be useful in Sod method definitions and
 client code.
@@ -144,8 +156,8 @@ client code.
   invalid when control exits the scope of the declaration.
 \end{describe}
 
-%%%--------------------------------------------------------------------------
-\section{Functions} \label{sec:runtime.functions}
+
+\subsection{Functions} \label{sec:runtime.object.functions}
 
 The following functions are provided in @|libsod|.