[xml] [QUESTION] DocBook v5.0CR1 document does not validate using xmllint v2.6.27

[Kevin Ruscoe <kevin sapphireoflondon org>]

Hi all

I am getting a validation error when using DocBook v5.0CR1 with xmllint 
v2.6.27.
Given the following document, for example:

==================================================================
test.dbk
--------
<?xml version="1.0" encoding="utf-8"?>
<article xmlns="http://docbook.org/ns/docbook"; version="5.0">
<info><title>Internals</title></info>

<section xml:id="Standards">
  <info><title>Standards</title></info>

  <para>
    <link xmlns:xlink="http://www.w3.org/1999/xlink";
          xmlns="http://docbook.org/ns/docbook";
          xlink:href="http://www.w3.org/TR/xml/";>
      <inlinemediaobject>
        <imageobject>
          <imagedata fileref="foo.png" format="PNG"/>
        </imageobject>
      </inlinemediaobject>
    </link>
  </para>
</section>
</article>
==================================================================
$ xmllint --noout --relaxng [snip]/docbook/rng/docbook.rng test.dbk

produces the following output:

==================================================================
$ xmllint --noout --relaxng 
/home/ruscoekm/my_tree/links/my_project/links/docbook/rng/docbook.rng 
test.dbk
test.dbk:5: element section: Relax-NG validity error : Did not expect 
element section there
test.dbk:5: element section: Relax-NG validity error : Expecting element 
example, got section
test.dbk:5: element section: Relax-NG validity error : Expecting element 
bridgehead, got section
test.dbk:8: element para: Relax-NG validity error : Did not expect 
element para there
test.dbk:8: element para: Relax-NG validity error : Expecting element 
example, got para
test.dbk:5: element section: Relax-NG validity error : Element article 
failed to validate content
test.dbk fails to validate
==================================================================

If I remove the inlinemedia object, the document validates successfully.

The same document validates successfully using the following tools:
* Jing (docbook.rng and docbook.rnc)
* Emacs nXML mode (docbook.rnc)

If people agree that this is a bug, I will raise a new ticket in Bugzilla.

Regards
Kevin