Hi,
I cannot reproduce it on Debian.
What is the output of
nsgmls -p t/data-20/test2-normalized.sgml
and
nsgmls -p t/data-20/test2.sgml
The output should be empty (and commands should be successful).
If it is not the case, the problem is probably that you are missing the
docbook sgml DTD
Best Regards,
--
Nekral