DOCBOOK-APPS: multiple graphics in a mediaobject

[Shawn <javajunkie@koyuru.com>]

Hello,

I consulted Robert Stayton's Example 16.1. Multiple graphics in a
mediaobject and tried:

<mediaobject  id="conceptual_diagram_database">  
  <imageobject  role="html">
    <imagedata  format="PNG" 
fileref="images/figures/Customer_list.png"/>
  </imageobject>
  <imageobject>
    <imagedata role="fo" format="PDF" 
fileref="images/figures/Customer_list.pdf"/>
  </imageobject>
</mediaobject>

But I get the following error:

Attribute "format" with value "PDF" must have a value from the list "BMP
CGM-CHAR CGM-BINARY CGM-CLEAR DITROFF DVI EPS EQN FAX GIF GIF87a GIF89a
JPG JPEG IGES PCX PIC PNG PS SGML TBL TEX TIFF WMF WPG SVG linespecific
". [62]

How can I get multilpe output formats with images?????????

If I try and PNG format, nothing appears (using either a PNG or PDF
formatted graphic)

Considerately,
 

-- 
Shawn <javajunkie@koyuru.com>

PS  apologies if this is posted twice