Here is Larry's answer to my question as to what it means for the
application/ipp media type to be "limited use".
Sounds reasonable to me.
>Return-Path: <masinter at parc.xerox.com>
>Date: Fri, 24 Oct 1997 12:11:34 PDT
>From: Larry Masinter <masinter at parc.xerox.com>
>Organization: Xerox PARC
>To: Tom Hastings <hastings at cp10.es.xerox.com>
>Cc: Ira Mcdonald x10962 <imcdonal at eso.mc.xerox.com>
>Subject: Re: IPP> MOD - Revised 'application/ipp' MIME type
>>Uh, this was an area where I was trying to set a pointer to
>'ask a real expert'. However, 'application/ipp' is not intended
>for use in email, in server PUSH, or in arbitrary applications
>that use MIME objects. You probably shouldn't expect
>to find files labelled as 'application/ipp' sitting in a document
>repository. Since it is solely intended for use within
>the IPP protocol which is implemented by tunnelling through
>HTTP/1.1, it's applicability is limited.