XML CSS Ordered lists and Mozilla

[Phil Weston <phil700@xmsg.com>]

Hi

I'm displaying my XML using CSS in Mozilla (IE is useless for this work) with some success but am having trouble getting <orderedlist>s to display

with:
<?xml version = "1.0" encoding = "UTF-8"?>
<?xml-stylesheet type="text/css" href="css/docbook.css"?>
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" "docbookx.dtd" []>
<book>
   <preface>
      <title>Preface</title>
      <itemizedlist mark = "opencircle">
         <listitem><para>b1</para></listitem>
         <listitem><para>b2</para></listitem>
         <listitem><para>b3</para></listitem>
      </itemizedlist>
      <orderedlist numeration = "arabic">
         <listitem><para>arabic1</para></listitem>
         <listitem><para>arabic2</para></listitem>
         <listitem><para>arabic3</para></listitem>
      </orderedlist>
   </preface>
</book>

where docbook.css contains:

itemizedlist {display: block;}
itemizedlist[mark="opencircle"] listitem{
  margin-left: 25pt;
  display: list-item;
  list-style-type: circle;}
orderedlist{display: block;}
orderedlist[numeration="arabic"] listitem {
  margin-left: 25pt;
  display: list-item;
  list-style-type: decimal;
}

My itemized lists work fine (so I guess my code syntax is correct) however my ordered list items all come out as 0., 0., 0. rather than 1., 2., 3., 

Anyone got any suggestions?

Cheers
P.