ok, that's what I thought. I tried with the xml.dcl included with openjade. (1.3.1 built from source) and it spews a whole load of errors:

booklet# make
/usr/local/bin/openjade -g -G -t rtf -o playlists.rtf -V '%scale-4up' -V '(define %tune-limit 2)' -V '(define %mixed-tune-ratio 0.5)' -d empeg.dsl /home/shared/empeg/booklet/xml.dcl playlists.xml
/usr/local/bin/openjade:playlists.xml:100:51:E: non SGML character number 0
/usr/local/bin/openjade:playlists.xml:100:51: open elements: player playlist[1] attribute[1] (#PCDATA[1])
/usr/local/bin/openjade:playlists.xml:351:57:E: non SGML character number 0
/usr/local/bin/openjade:playlists.xml:351:57: open elements: player playlist[1] attribute[1] (#PCDATA[1])
/usr/local/bin/openjade:playlists.xml:411:63:E: non SGML character number 0
/usr/local/bin/openjade:playlists.xml:411:63: open elements: player playlist[1] attribute[1] (#PCDATA[1])
/usr/local/bin/openjade:playlists.xml:804:53:E: non SGML character number 0
/usr/local/bin/openjade:playlists.xml:804:53: open elements: player playlist[1]
...
and so on.

I guess there's come version dependancies somewhere.