Caption on informalfigure not recognised by PDF stylesheet?

Hi there!

I came across an issue with the PDF stylesheets, but I am not sure if it is a bug nor not. Assume I have the following XML:

<section xmlns="http://docbook.org/ns/docbook" version="5.0">

	<title>Section title</title>

	<para>Some para</para>

	<informalfigure>

		<mediaobject>[…]</mediaobject>

		<caption>

			<para>Caption comes here</para>

		</caption>

	</informalfigure>

</section>

The snippet validates as valid Docbook XML but the resulting PDF however shows the caption element in red (no matching template found). I am using 1.78.1. Can someone confirm that this is a bug?

Thank you!

/Frank Arensmeier

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