RE: [ebxml-dev] CPPA Message Packaging

[Dale Moberg <dmoberg@cyclonecommerce.com>]

OK, here is a short example using
a standard use case (which I am
uncertain is actually used anywhere!)

The normal ebXML Request message has
a MIME structure that consists of
a "multipart/related" MIME entity
that in turn consists of two MIME
entities: a SOAP envelope (text/xml)
and a payload (with a MIME type typically
of text/xml, application/xml, or
some other xml flavored MIME type,
such as application/something+xml.)

An extension might be to add a third
MIME entity within the multipart/related
of (making this up) application/cadcam-drawing.

This extension would be used in an industry
in which a Purchase Order might be accompanied
by a machine-readable specification for the
items(s) being purchased. A CPA template or CPP
for this "extension" could then indicate
how this PO+cadcam request was packaged.

The MIME packaging procedure is inherently extensible in this
way. MIME specifies a default processing mode for any
multipart/subtypes, which is to just fall back to multipart/mixed
handling, which then just processes each bodypart in accordance
with its MIME handler, or with the default handler
(a handler that might just store the bodypart in a file). 

The multipart/related type is, however, one in which
some richer semantics for processing is indicated. How do we
tell whether this semantics is supported or not? We could call
up the other side once we knew all the details!  Or,
better/faster/cheaper, we could rely on a more automated process 
to set up this richer connection when possible. That is one thing 
CPPA related approaches are trying to do. 

If you are actually interested in XML text of a
Packaging element with extensions beyond those of
ebXML messaging, you can find some
(a little outdated) in the ebXML Technical Architecture
Security Risk support, in  one of the appendices.

Dale Moberg

-----Original Message-----
From: Laura McLean [mailto:laura.mclean@briyante.com]
Sent: Friday, January 04, 2002 11:44 AM
To: Dale Moberg; ebxml-dev@lists.ebxml.org
Subject: RE: [ebxml-dev] CPPA Message Packaging


Dale,

Thanks alot for your help.  I have a couple more questions based on your
response.
Can you define "extensions" and "MIME structure", what do  you mean and
what's the difference between the two?  Also, can you give me an example
where the CPA specifies extensions?

Thanks again,

Laura McLean

-----Original Message-----
From: Dale Moberg [mailto:dmoberg@cyclonecommerce.com]
Sent: January 4, 2002 10:02 AM
To: laura.mclean@briyante.com; ebxml-dev@lists.ebxml.org
Subject: RE: [ebxml-dev] CPPA Message Packaging


Here is a short start:

The CPPA notation provides a way to document
what packaging will be used in the implementation
of a business process. The MIME structures of the
messages are described.

The Messaging group specifies what the ebXML 
packages are and what are the ways to extend or combine
these packaging options. 

The Messaging specification describes specific MIME
structures for packaging using the "multipart/related"
type. Because extensions are possible, the CPPA group
allows parties to disclose to other parties or discover 
from other parties the extensions they support.
They then agree on the actual extensions to be used,
if any.

Even when basic ebXML packaging is used, there
are options in how messages return information. For
example, when using HTTP, one message may return
messaging level signals "synchronously", while
another message may independently and "asynchronously"
return business signals and business response. The
possible combinations and options supported 
in this area can be documented
in CPPs and the ones to be used 
can be agreed to in a CPA for the 
business process of interest.


-----Original Message-----
From: Laura McLean [mailto:laura.mclean@briyante.com]
Sent: Friday, January 04, 2002 10:31 AM
To: ebxml-dev@lists.ebxml.org
Subject: [ebxml-dev] CPPA Message Packaging


Both the ebXML CPPA and TRP specifications use message packaging.  I am
not
sure what the purpose of the packaging in the CPP/CPA is, and what the
relationship between the CPP/CPA and TRP packaging is.  Can anyone clear
this up for me?

Thanks for your help,

Laura McLean




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