DOCBOOK-APPS: missing id ?!?

[camille <camille@mandrakesoft.com>]

Hi all,

I'm running through a strange behavior, on something so simple that I
hesitated a lot before posting:
 
SAXON 6.4.3
docbook-style-xsl-1.45

Thanks for your help, Camille.

------ shell interaction --------------
$ java com.icl.saxon.StyleSheet  -o test.html test.xml \
/usr/share/sgml/docbook/xsl-stylesheets/html/docbook.xsl
Error: no ID for constraint linkend: cvs.
XRef to nonexistent id: cvs
----------------------------------------

--------- test.xml -----------
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
"/usr/share/sgml/docbook/xml-dtd-4.1.2/docbookx.dtd">

<article lang="en">
  <title>MandrakeSoft</title>
  <sect1 id="cvs">
    <title>Introduction</title>

    <para>First</para>
      
  </sect1>

  <sect1>
    <title>Directions</title>

      <para> Then read <xref linkend="cvs"/>.</para>
  </sect1>

</article>
--------------------------------