DOCBOOK-APPS: ?? in TOC

[Tim =?iso-8859-15?q?Terleg=E5rd?= <tim@se.linux.org>]

Hi, the table of contents in my document shows mostly '??' instead of page 
numbers, but some page numbers are actually shown. I decided to see if I had 
any tag errors, so I made a new small file, but it shows the same thing.

This little SGML file below results in a TOC showing these ??. The PDF of the 
SGML file below is at http://www-und.ida.liu.se/docbook.pdf
I guess the problem is when transforming SGML to LaTeX, because the .dvi file 
also has the ??. I use OpenJade and the DSSSL stylesheet that OpenJade 1.3 
offers.
-----
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook V3.1//EN">

<book>
  <title>Some title</title>

  <chapter>
    <title>Introduction</title>
    <para>
    Introduction
    </para>

    <sect1>
      <title>Sect1</title>
      <para>
      some text
      </para>
    </sect1>
  </chapter>
</book>
-----

Is this problem known?

Thanks,

Tim
tim@se.linux.org