db4-upgrade.xsl dropping <title> elements from <refsynopsisdiv>

[Jon Leech <jon@alumni.caltech.edu>]

    If I convert the attached Docbook 4 file via e.g.

xsltproc /usr/share/xml/docbook/stylesheet/docbook5/db4-upgrade.xsl db4.xml > db5.xml

    the resulting Docbook 5 file drops the <title> element from the
<refsynopsisdiv> section (but not from the converted <refsect1> section).
This seems like a bug in the conversion, but I wanted to check that I
wasn't missing something before filing a bug against the Sourceforge
project. The db4-upgrade.xsl version is

# Release: $Id: db4-upgrade.xsl 7660 2008-02-06 13:48:36Z nwalsh $

    Thanks,
    Jon Leech

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
              "http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd";>
<refentry id="glGetError">
    <refmeta>
        <refentrytitle>glGetError</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>glGetError</refname>
        <refpurpose>return error information</refpurpose>
    </refnamediv>
    <refsynopsisdiv>
        <title>Refsynopsisdiv Title</title>
        <para> A paragraph </para>
    </refsynopsisdiv>
    <refsect1>
        <title>Refsect1 Title</title>
        <para> A paragraph </para>
    </refsect1>
</refentry>

<!-- Converted by db4-upgrade version 1.0 -->

<refentry xmlns="http://docbook.org/ns/docbook"; version="5.0" xml:id="glGetError">
    <refmeta>
        <refentrytitle>glGetError</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>glGetError</refname>
        <refpurpose>return error information</refpurpose>
    </refnamediv>
    <refsynopsisdiv>
        
        <para> A paragraph </para>
    </refsynopsisdiv>
    <refsection><info><title>Refsect1 Title</title></info>
        
        <para> A paragraph </para>
    </refsection>
</refentry>