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+\section{Table structures}\label{s:structs}
+
+This section only documents table structures shared among multiple modules. API-specific table structures are documented in the corresponding sections.
+
+\subsection{Signal aspect table}\label{s:sigasp}
+Signal aspect tables may contain the following members:
+\begin{apidoc}{Signal aspect table}
+\item \apifield{main} The aspect of the main signal.
+\item \apifield{type} The type of signal. Please refer to section \ref{s:srtypes} for more information.
+\item \apifield{dst} The aspect of the next main signal.
+\item \apifield{shunt} Whether shunting is allowed.
+\item \apifield{proceed\_as\_main} When shunting is not allowed, whether to let the train continue with shunt mode disabled.
+\end{apidoc}
+
+The \texttt{main} and \texttt{dst} fields may contain one of the following:
+\begin{itemize}
+\item $n \geq 0$, which changes the speed limit of the corresponding type to $n$, or (for distant signals) indicates the speed limit for the upcoming main signal.
+\item $-1$, which lifts the speed limit of the corresponding type, or (for distant signals) indicates that the speed limit is lifted at the upcoming main signal.
+\item \luanil, which keeps the speed limit unchanged.
+\end{itemize}
+
+\subsection{Train speed restriction table}
+The speed restriction table for trains includes the speed limits for a train, where the key is the type of speed limit and the value is the speed limit itself.
+
+%%% Local Variables:
+%%% TeX-master: "a4manual"
+%%% End:
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