DOCBOOK-APPS: Registered Trademark as Superscript

Hi!

I'm using the DocBook style sheets 1.70 in conjunction with JadeTeX
3.10. My DSSSL customization layer contains:

(element trademark
  (make sequence
    ($charseq$)
    (cond
     ((equal? (attribute-string "class") (normalize "copyright"))
      (literal "\copyright-sign;"))
     ((equal? (attribute-string "class") (normalize "registered"))
      ($ss-seq$ + (literal "\registered-sign;")))
     ((equal? (attribute-string "class") (normalize "service"))
      ($ss-seq$ + (literal "SM")))
     (else
      (literal "\trade-mark-sign;")))))

I changed the definition for class="registered" to read

($ss-seq$ + (literal "\registered-sign;")))

in order to get a superscript Registered Trademark sign. This approach
works nicely for the main text. In tables, however, the sign is NOT shown
in superscript. It is aligned to the baseline of the current font
instead. Why is this the case? Is it a JadeTeX bug?

Thanks for any advice!

Regards,

	Holger