Media type encoding parameter?

While writing the interoperability section of the media type, I
realized that there may be a need for an additional optional parameter
on the SOAP media type for specifying the encoding style[1].

The reason I think it would be useful is that it would help a
receiving processor know whether or not they could process the message
without breaking into the body, as with action/SOAPAction.

Usage;

 Content-Type; application/soap+xml; encoding="http://.."

Issues;
- good idea or not?
- name?  "encoding"?  "encodingstyle"?  "encstyle"?  "soapenc"?

 [1] http://www.w3.org/TR/soap12-part1/#soapencattr

MB
-- 
Mark Baker, Chief Science Officer, Planetfred, Inc.
Ottawa, Ontario, CANADA.      mbaker@planetfred.com
http://www.markbaker.ca   http://www.planetfred.com