Cannot validate a UTF-8 document with <mediaobject>

[Shlomi Fish <shlomif@gmail.com>]

Hi all!

I cannot seem to validate the attached document using:

{{{
xmllint --relaxng http://www.docbook.org/xml/5.0/rng/docbook.rng
hebrew-html-tutorial.xml
}}}

I'm on Mandriva Linux Cooker. When I comment out the <mediaobject> it
validates. My question is why? What am I doing wrong?

Regards,

-- Shlomi Fish

-- 
------------------------------------------
Shlomi Fish http://www.shlomifish.org/

Electrical Engineering studies. In the Technion. Been there. Done
that. Forgot a lot. Remember too much.
<?xml version='1.0' ?>


<book xmlns="http://docbook.org/ns/docbook"; xmlns:xlink="http://www.w3.org/1999/xlink"; version="5.0" xml:id="index" xml:lang="he">
    <info>
        <title>המדריך העברי ל-HTML תקני</title>
        <author>
            <personname>
                <firstname>Shlomi</firstname>
                <surname>Fish</surname>
            </personname>
            <affiliation>
                <address>
                    <email>shlomif@iglu.org.il</email>
                </address>
            </affiliation>
        </author>
        <copyright>
            <year>2008</year>
            <holder>Shlomi Fish</holder>
        </copyright>
        <legalnotice xml:lang="en">
            <!-- Ci vis pacem -->
            <para>
                <!-- belum. ;-) -->
                This document was written by Shlomi Fish and is available
                under the terms of either the:
            </para>
            <orderedlist>
                <listitem>
                    <para>
                        <link xlink:href="http://creativecommons.org/licenses/publicdomain/";>The Public Domain</link>,
                        as defined by the Creative Commons or your local
                        jurisdication.
                    </para>
                </listitem>
                <listitem>
                    <para>
                        <link xlink:href="http://creativecommons.org/licenses/by/3.0/";>The Creative Commons Attribution License (CC-by) version 3.0</link>
                        (or at your option any later version of the same
                        license.)
                    </para>
                </listitem>
                <listitem>
                    <para>
                        The 
                        <link
                            xlink:href="http://www.opensource.org/licenses/mit-license.php";>MIT
                            X11 License</link>.
                    </para>
                </listitem>
            </orderedlist>
        </legalnotice>
        <revhistory>
            <revision>
                <revnumber>2780</revnumber>
                <date>27 April 2008</date>
                <authorinitials>shlomif</authorinitials>
                <revremark>
                    Started working on this document after forking the template
                    of an older one.
                </revremark>
            </revision>
        </revhistory>
    </info>

    <chapter xml:id="basic-html">
        <info>
            <title>HTML בסיסי</title>
        </info>
    <section xml:id="more-HTML-tags">
        <info>
            <title>תגי HTML נוספים</title>
        </info>
        <para>
            בפרק זה נכיר תגי HTML נוספים ושימושיים.
        </para>
        <section xml:id="headings">
            <info>
                <title>כותרות - h1, h2, h3</title>
            </info>

            <para>
                וכך זה נראה:
            </para>

            <mediaobject>
                <imageobject>
                    <imagedata 
                        fileref="images/h1-h2-example.png" format="PNG"
                        />
                </imageobject>
            </mediaobject>


            <para>
                Foo.
            </para>

        </section>
    </section>

    </chapter>
</book>