<userinput> causes callouts to reset sequence number

All,

I am using XML XSL, and xsltproc.

When I translate the following xml into html, I get two callouts
numbered one.  I think I should get a 1 and a 2.  Is my thinking flawed?

<?xml version='1.0' encoding='utf-8' ?>
<!DOCTYPE chapter PUBLIC '-//OASIS//DTD DocBook XML V4.2//EN'
                        
'http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd'>
<chapter id='Chapter'>
<title>Sample Chapter</title>
<screen>
<prompt>$</prompt><userinput>cp a b<co id='cp-co'
linkends='cp'/></userinput>
<prompt>$</prompt><userinput>mv a b<co id='mv-co'
linkends='mv'/></userinput>
</screen>
<calloutlist>
<callout arearefs='cp-co' id='cp'>
<para>This is a copy.</para>
</callout>
<callout arearefs='mv-co' id='mv'>
<para>This is a move.</para>
</callout>
</calloutlist>
</chapter>

If I can correct in my thinking, I will enter the bug at sf.net.

Thanks.

John