DOCBOOK: TRADEMARK tag misbehaves

[Simos Xenitellis <S.Xenitellis@rhbnc.ac.uk>]

Hello, 
	When TRADEMARK is used, no matter what is the Class attribute,
the result is the CLASS=TRADE symbol.

That is, for test.sgml,

=========
<!DOCTYPE para PUBLIC "-//Davenport//DTD DocBook V3.0//EN" [
]>    

<PARA>
	This is a <TRADEMARK>TRADEMARK</TRADEMARK>.
	This is a <TRADEMARK CLASS=REGISTERED>REGISTERED TRADEMARK</TRADEMARK>.
	This is a <TRADEMARK CLASS=SERVICE>SERVICE TRADEMARK</TRADEMARK>.
</PARA>
=========

I get the (TM) symbol in all cases. 

Sample .dvi is included.
I have tried both db144.zip (stylesheets from cygnus) and the new ones,
db150.zip.

TIA,
Simos Xenitellis

Problematic TRADEMARK issue