bridgehead not allowed in variablelist?

[Tim Arnold <jtim.arnold@gmail.com>]

Hi,
I am validating using xerces, onvdl.jar with the docbook 5.1b2
docbook.nvdl (also tried the 5.0 nvdl)
I'm getting an error that says
error: elem "bridgehead" from namespace
"http://docbook.org/ns/docbook"; not allowed in this context.

However, from the spec here, I thought it is legal:
http://www.docbook.org/tdg5/en/html/bridgehead.html

Can someone help me understand the problem? example file appended below.
thanks,
--Tim Arnold


Example document xml:

<chapter xmlns="http://docbook.org/ns/docbook"; version="5.0">
  <info><title>my chapter</title></info>
  <para>
  <variablelist>
    <varlistentry>
      <term>myterm</term>
      <listitem><para>definitions</para></listitem>
    </varlistentry>
    <bridgehead> testing my header </bridgehead>
    <varlistentry>
      <term>my second term</term>
      <listitem><para> more definitions</para></listitem>
    </varlistentry>
   </variablelist>
  </para>
</chapter>