Ambiguous rule match varlistentry/term vs. *[@xlink:href]

[jtojnar]

When converting the following reference into a manual page using xsltproc --nonet "http://docbook.sourceforge.net/release/xsl-ns/current/manpages/docbook.xsl" "man-pages-combined.xml (libxslt 1.1.35, docbook-xsl 1.79.2), there is an ambiguous match, causing the appstream.enable to be printed twice.

<?xml version="1.0"?>
<reference xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <title>NixOS Reference Pages</title>
 <info>
  <author>
   <personname>
    <firstname>Eelco</firstname>
    <surname>Dolstra</surname>
   </personname>
   <contrib>Author</contrib>
  </author>
  </info>
 <refentry>
  <refmeta>
   <refentrytitle>
    <filename>configuration.nix</filename>
   </refentrytitle>
   <manvolnum>5</manvolnum>
   <refmiscinfo class="source">NixOS</refmiscinfo>
  </refmeta>
  <refnamediv>
   <refname>
    <filename>configuration.nix</filename>
   </refname>
   <refpurpose>NixOS system configuration specification</refpurpose>
  </refnamediv>
  <refsection>
   <title>Options</title>
   <variablelist>
    <varlistentry>
     <term xlink:href="#opt-appstream.enable" xml:id="opt-appstream.enable">
      <option>appstream.enable</option>
     </term>
     <listitem>
      <para>Whether to install files to support the AppStream metadata specification.</para>
     </listitem>
    </varlistentry>
   </variablelist>
  </refsection>
 </refentry>
</reference>

This did not happen with libxslt 1.1.34 because it was not following the specification properly. libxslt 1.1.35 fixed the compliance thus revealing the issue.

We get the same result using saxon man-pages-combined.xml "http://docbook.sourceforge.net/release/xsl-ns/current/manpages/docbook.xsl" (saxon 6.5.3) and it gives more info:

Recoverable error
Ambiguous rule match for /reference[1]/refentry[1]/refsection[1]/variablelist[1]/varlistentry[1]/term[1]
Matches both "d:varlistentry/d:term" on line 115 of http://docbook.sourceforge.net/release/xsl-ns/current/manpages/lists.xsl
and "*[@xlink:href]|d:ulink   |d:imagedata|d:audiodata|d:videodata   |d:footnote[not(ancestor::d:table)]   |d:annotation|d:alt" on line 182 of http://docbook.sourceforge.net/release/xsl-ns/current/manpages/endnotes.xsl