imageobject is not displayed with any backend other than HTML

["John Lumby" <johnlumby@hotmail.com>]

I am trying to include a graphics object in a document that I format using 
pdf backend (pdfjadetex).     I have tried every imagainable variation on a 
basic theme of

<inlinemediaobject>
<imageobject role="fo">
<imagedata fileref="diagram.pdf"  format="PDF">
</imageobject>
</inlinemediaobject>

I have tried with different formats of the diagram file including JPG and 
PS.   I have tried specifying positioning and sizing attributes such as 
contentwidth="5in" contentdepth="7in" width="6in" depth="8in" on imagedata.  
       I get blanks space if the backend is pdf or ps or tex.   It works 
fine and the diagram is displayed if I format for html.

My dtd is 4.5CR3:
<!doctype article PUBLIC "-//OASIS//DTD DocBook V4.5CR3//EN" [
]>

I format like so:
jw -s /usr/local/share/sgml -f 
/usr/local/share/sgml/docbook/utils-0.6.14/frontends/docbook -b pdf -p 
/usr/local/bin/openjade -o <mydir> document.sgml

I see no errors from the parser or from pdfjadetex.     But no diagram.      
Since the diagram appears in an html backend document, the above 
image-related docbook elements can't be completely wrong (and I took them 
from examples in the definitive guide anyway).

I see plenty of references to other people doing this but not this problem.  
    Can anyone suggest what I am missing?

BTW I discovered that I could make the document appear by formatting to 
backend tex, editing the document.tex and adding some tex commands to
\includegraphics{diagram.pdf}
and then pdfjadetex'ing it.

But there must be a better way ???

John

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