From: Eric Burger <[EMAIL PROTECTED]>

   In the e-mail world, the ;handling property was created for gateways  
   (B2BUA's), so the gateway could know whether dropping a body part,  
   because the connected network/protocol could not handle that body  
   part, would render the message useless. For example, if I am using an  
   old version of Outlook, and I send you a Word file, the Word body part  
   is required for the relay, but the application/tnef (proprietary  
   Outlook stuff) is optional and the gateway can silently drop the part.

Ah!  This is an interesting difference, as the concept is that the
handling property is "global", that is, if a part labeled "required"
is necessary for successful processing of the entire message.  (As
opposed to the "local" concept, where it is only neccessary for the
successful processing of the containing multipart, whose processing
might not be necessary for processing the entire message.)

Of course, with one-level nesting, the two are equivalent.

Dale
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