When I run xmlroff on the attached fo file, I get the error, see below. I am clueless about fo files, so please let me know how I can assist in debugging this. The fo file was obtained by running xsltproc on the docbook xml file.
(process:21637): libfo-CRITICAL **: Expression evaluation error: Expression not completely evaluated: '://docbook.sourceforge.net/release/images/draft.png'
Object path: /FoTree[1]/root[1]/layout-master-set[1]/simple-page-master[38]/region-body[1]
Object path: /FoTree[1]/root[1]/layout-master-set[1]/simple-page-master[38]/region-body[1]
(process:21637): libfo-CRITICAL **: fo_object_log_or_propagate_error: assertion `src != NULL' failed
libfo-ERROR **: file fo-expr-eval.c: line 506 (parse_number): should not be reached
aborting...
Aborted
Gzipped fo file
Logged In: YES
user_id=498357
Originator: YES
Forgot to mention that this is with xmlroff version 0.4.0.