In our work we have a Netscape/IE plug-in which receives downloaded
XML and stylesheet data, and sends a resulting HTML stream to the
browser rendering engine. We have certainly found it useful on occasion
to include sections of HTML data which are skipped by the XML parser
and sent without modification to the browser. Our browser is set, for
the moment, to accept both <HTML> </HTML> sections within XML,
and also <XML> </XML> sections within HTML sections.
It would seem to me that when browsers are able to operate in either
HTML, or XML + XSL modes, then being able to switch modes within
a document (being able, in effect, to embed in either direction) could
indeed become quite relevant and useful.
Boris Moore
RivCom
"Publishing Structured Information"
www.rivcom.com