Problems generating PDF from FO DOM with SVG in code.

Question

Colleagues,
I am using FOP 0.20.5rc to render an FO DOM I have in a javax.xml.transform.dom.DOMResult into a PDF output stream destined ultimately for an attachment to an email. The FO DOM contains SVG generated from a JPEG image.
If dump the FO DOM to a file and then generate the PDF using FOP from the command line I get the image in the document.
If I pass the FO DOM to a FOP Driver in code I get the document but no image!
I'm obviously missing some vital configuration option in code but for the life of me I can't see it.
Any help would be gratefully received,
Peter
PS. Some of the code:
Driver driver = new Driver();
driver.setLogger(new org.apache.avalon.framework.logger.NullLogger());
driver.setRenderer(Driver.RENDER_PDF);
driver.setOutputStream(new java.io.FileOutputStream("c:\\temp\\out.pdf"));
driver.render((Document)foDOM.getNode());

Answer 1

Output from run with a ConsoleLogger instead of a NullLogger:
[java] [INFO] building formatting object tree
[java] [WARNING] Screen logger not set - Using ConsoleLogger.
[java] [INFO] setting up fonts
[java] [INFO] [1]
[java] [DEBUG] Last page-sequence produced 1 pages.
[java] [INFO] Parsing of document complete, stopping renderer
[java] [DEBUG] Initial heap size: 2434Kb
[java] [DEBUG] Current heap size: 2142Kb
[java] [DEBUG] Total memory used: -292Kb
[java] [DEBUG] Memory use is indicative; no GC was performed
[java] [DEBUG] These figures should not be used comparatively
[java] [DEBUG] Total time used: 781ms
[java] [DEBUG] Pages rendered: 1
[java] [DEBUG] Avg render time: 781ms/page
As far as I can tell, it's not complaining about anything,
Peter