just one file. Details of content path(s) are used for:
\begin{itemize}
-\item Presentation to the user.
-\item Actually opening the files to decode / examine them.
-\item UI to `find' missing content.
+\item \emph{[UI]} Presentation to the user.
+\item \emph{[UI]} UI to `find' missing content.
+\item \emph{[Back-end]} Actually opening the files to decode / examine them.
\end{itemize}
+If we create the coalesced \texttt{Content} on building the pieces for
+the player, it will never appear in the user interface. This means
+that it needs only the \emph{[back-end]} interfaces.
+
+However, it seems silly to create a specialised different
+\texttt{FFmpegContent}-like type to express the tiny difference
+between single- and multi-file.
+
+This suggests that the `shame' above is not a big deal.
+
\end{document}