Mapping http://docbook.sourceforge.net identifier (catalogs)

Hi,

I have some trouble of the sort

{?Could not retrieve image from 'http://docbook.sourceforge.net/release/images/draft.png': java.net.NoRouteToHostException: No route to host}

when trying to render a docbook document translated to fo with XEP. (this is 
due to the fact that we are now firewalled and use a proxy). But more 
importantly, I would like to avoid fetching things like that, as they are
locally installed in my case (eg 
/usr/share/sgml/docbook/stylesheet/xsl/nwalsh/images/draft.png).

I thought this would be taken care of by catalog files, but I couldn't find
any mapping of docbook.sourceforge.net to local files. Is there a reason ?

(NB: I am using Debian, and until now most things were automagically 
catalogued correctly).

Should I add something directly to /etc/catalogs, or how else to properly 
setup these things ?

(NB: I have compiled the little java extension from 
http://xep.xattic.com/lists/xep-support/0680.html to make catalogs available 
to XEP, so that should not be a problem).

Thanks in advance,
  Marc Baaden

-- 
 Dr. Marc Baaden  - Institut de Biologie Physico-Chimique, Paris
 mailto:      -      http://www.marc-baaden.de
 FAX: +49 697912 39550  -  Tel: +33 15841 5176 ou +33 609 843217