Bug#606421: More rendering issues with the refcard
Quoting "Osamu Aoki" <firstname.lastname@example.org>:
XMLROFF may not stop build but that does not mean they build usable
page for CJK (i.e., zh). That was the reason I am using DBLATEX
(DocBook XML to Latex using XeTeX backend) for DDP projects.
In fact, the Makefile for the refcard choses between dblatex and
xmlroff on a per-language base. In general, dblatex gives nicer
output, but in some cases xmlroff works better. Try to play with
the switches in Makefile and compare the results...