DOCBOOK-APPS: openjade vs. jade

["A.R. (Tom) Peters" <tpeters@xs4all.nl>]

When I process my DocBook XML file with the command:

jade -t tex -V tex-backend \
     -d /usr/share/sgml/docbook/stylesheet/dsssl/modular/print/docbook.dsl \
     /usr/share/sgml/declaration/xml.dcl \
     book.xml

Then I get reasonable output.

I got the recommendation to use openjade instead.  However, if I do, I get
loads of messages like:

openjade:/usr/share/sgml/docbook/dtd/xml/3.1.7/docbook.cat:27:0:W: DTDDECL
catalog entries are not supported
openjade:/usr/share/sgml/docbook/stylesheet/dsssl/modular/catalog:28:0:W:
DTDDECL catalog entries are not supported

So openjade is not a drop-in replacement of jade?  Any caveats?
What is going on, what might be wrong with DTDDECL's?

--
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	Tom "thriving on chaos" Peters
		NL-1062 KD nr 149	tel.    +31-204080204
 			Amsterdam	e-mail  tpeters@xs4all.nl