DOCBOOK-APPS: "Undefined namespace prefix" when processing images

Hi,

When creating HTML with xsltproc and either docbook xsl 1.51.1 or 1.52.2, I
receive the following error:
    Error Undefined namespace prefix
    xmlXPathCompiledEval: evaluation failed
An HTML file gets created but the document only goes up to the point where
the image is defined. Here's where it's stoping:

   <para><figure float="1" pgwide="0">
   <mediaobject>
	    <imageobject>
	      <imagedata fileref="datamodel.gif" format="GIF"/>
	    </imageobject>
	  </mediaobject>
	    <title>XML Processing Model</title>
	  </figure>
   </para>

This problem does not occur with FO --> PDF.

I saw an earlier post about this in the archives but no answers were in the
archive.

Philip Glaser
Principal and Software Architect
Sustainable Software Solutions, LLC

www.sustainsoft.com
973-951-9522