DOCBOOK-APPS: XSLTproc error on processing images

I was trying to use xsltproc to convert an xml file 
to html output:

 

xsltproc file:///c:/docbook/docbook-xsl/html/docbook.xsl 
inputfile.xml > ouputfile.html

 

when I got the 
following error:

 

Error Undefined namespace prefix

xmlXPathCompiledEval: evaluation 
failed

 

whereupon xsltproc hangs and has to be terminated 
via CTRL-C, this happens also

for FO output with the exception that it does not 
hang.

 

even worse is when I try to generate chunked html 
output using:

 

xsltproc file:///c:/docbook/docbook-xsl/html/chunk.xsl 
inputfile.xml

 

which causes xsltproc to crash and windows produces a 
messagebox saying:

 

************************************************************************

* 
ProgramError                                             
            *

*    xsltproc.exe has generated 
errors and will be closed by Windows.  *

*    You will need to restart the 
program.                             
*

*                                                                      *

*    An error log is being 
created.            
                
        *

*                                                                      *

*                               [OK]                                   
*

************************************************************************

 

The commandline says the same thing:

 

Error Undefined namespace prefix

xmlXPathCompiledEval: evaluation failed

 

Before this error is thrown, xsltproc does actually manage to 
produce some output,

namely upto where I have included an image, here is the XML 
DocBook snippet:

 

    <figure><title>The Fox Fur 
Nebula</title>
      
<mediaobject>
        
<imageobject>
          
 <imagedata fileref="foxfurnebula.png" 
format="PNG"/>
        
</imageobject>
        
<imageobject>
           <imagedata 
fileref="foxfurnebula.jpg" 
format="JPG"/>
        
</imageobject>
      
</mediaobject>
    </figure>

 

So I assume that xsltproc is having problems with this section 
of my document

although it validates fine with xmllint and onsgmls so I'm 
stymied.  I have also

searched the mail archives, there is a problem that 
produces a similar error that

was to do with namespaces but I don't have a clue what 
they are about yet.

 

I would have thought that at least xsltproc should fail 
gracefully, is this a bug?

 

Regards

 

AM