ebXML versus an enveloping approach that uses CDATA Sections

I am dealing with a vertical standards initiative that is suggesting the use
of CDATA sections to contain the message within their envelope instead of
the approach that ebXML uses which I would describe as MIME content
identifiers.

Can anyone provide me information about the reason not to take this
approach? The best that I've come up with is the impact of this on security
and authentication checking.

Thanks

Arthur Colman
Drybridge Consulting (www.drybridge.com)
Phone: 617.803.2546
Fax: 208.730.4596