An <appendix> that contains only a <glossary> is not valid (db5_rc7)

["Francesco Pretto" <ceztkoml@gmail.com>]

Following excerpt is not valid (unfinished element):

<?xml version="1.0" encoding="UTF-8"?>
<appendix xmlns="http://docbook.org/ns/docbook";
	      version="5.0"
	      xml:id="glossary"
	      xreflabel="Glossary">
	
<title>Glossary</title>

<glossary></glossary>

</appendix>

While this one is valid:

<?xml version="1.0" encoding="UTF-8"?>
<appendix xmlns="http://docbook.org/ns/docbook";
	      version="5.0"
	      xml:id="glossary"
	      xreflabel="Glossary">
	
<title>Glossary</title>

<glossary></glossary>
<para></para>

</appendix>

Bug?

Thanks,
Francesco