custom class attributes

Is there a way to get "custom class attributes" as described in 
"http://www.sagehill.net/docbookxsl/UsingCSS.html#CustomClass" 
for other elements than the mentioned "emphasis, entry, para, 
and phrase"?

I want to markup some deeply nested <section>s as <bridgehead> (to not
get section numbers for these) but want to pass down a class attribute
to be used in my CSS.

Michael
-- 
                              http://www.miwie.org