I don't see your point at all. Why do you need to tell the browser? The
browser knows that the DSSSL keyword in the catalog designates a DSSSL
specification (it could include transformation specs as well as stylesheets)
the same way it knows that the SGMLDECL entry designates an SGML
specification, and the same way it would know that a type of
dsssl-specification in a SEMANTICS entry
SEMANTICS "dsssl-specification" "Stylesheet title" foo.dsl
means DSSSL specification.
James