Just for the record, I have seen the following in the debian-devel mailing
list:
http://lists.debian.org/debian-devel/2006/01/msg01830.html
Indeed, the xerces26 package in sarge uses CDBS to build two variants of
the package from the same source. This might be interesting for us
regarding the 2.1/2.9 split of the octave-forge package.
--
Rafael