Cannot validate a UTF-8 document with <mediaobject>

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.