DOCBOOK-APPS: FOP: "No ImageReader" when using PDF as vector format

[Joachim Ziegler <ziegler at mpi-sb dot mpg dot de>]

Hello,

Bob Stayton writes in "Using the XSLT Sheets" that
FOP can handle PDF as a vector format:

Table 16.6. FO processor supported graphics formats
FO Processor Bitmap formats Vector formats
FOP PNG JPEG SVG PDF


But I get the following error from FOP 0.20.5rc2

[ERROR] Error while creating area : No ImageReader for this type of 
image (file:/KM/usr/ziegler/LEDA/Tutorial/pdf/Pictures/ArrayOfChar.pdf)


My DocBook source is the following:

  <mediaobject>
    <imageobject  role="html">
      <imagedata  align="center" format="PNG" 
fileref="Pictures/ArrayOfChar.png"/>
  </imageobject>

    <imageobject  role="fo">
      <imagedata  align="center" format="PDF" 
fileref="Pictures/ArrayOfChar.pdf"/>
    </imageobject>
  </mediaobject>


Can someone please help me? I've already browsed through the mailinglist 
archive and the bug reports of FOP, but I haven't found anything.


I'm using java version "1.3.1", DocBook Stylesheets 1.60.1


Greetings,
Joachim