Is text/html registered with IANA?

Todd Inglett <tinglett@VNET.IBM.COM>
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Date: Thu, 23 Jun 1994 20:10:59 +0200
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From: Todd Inglett <tinglett@VNET.IBM.COM>
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Subject: Is text/html registered with IANA?
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[BTW, How does one find out if something is registered with the Internet
Assigned Numbers Authority?]

I assume that someone has registered text/html as an official MIME
content type.  What about something like message/external-body type=url;
 name=http://whatever.xx.x/xxx?  It would be nice if some e-mail (or
part of a multipart message) could be posted as a url.

-todd inglett