Output produced by Jade for TeX does not work. The TeX output contains a
line with garbage:

{^@^@}\def\sbNom%

(^@ stands for ASCII 0 here)
which causes TeX to complain.

Some input:

<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook V3.1//EN">
<chapter> <title> This is a title </title>
<sect1> <title> A section </title>
<para>
This is some text
</para>
</sect1>
</chapter>

jl1.quim.ucm.es~> jade -t tex -d \
/usr/lib/sgml/stylesheets/nwalsh-modular/print/plain.dsl -o kk.tex kk.sgml

jl1.quim.ucm.es~> jadetex kk.tex
[output omitted]
! Text line contains an invalid character.
l.203 {^^@
          ^^@}\def\sbNom%
! Text line contains an invalid character.
l.203 {^^@^^@
             }\def\sbNom%
[1.0.12] [2.0.12] (kk.aux) )
[more output omitted]



This makes docbook pretty unusable, at least for printing. Automatic
conversion from docbook to dvi or pdf, using the commands db2dvi and
db2pdf does not work for the reason above.