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Re: Messaging Service Layer

From: Mark Baker <distobj@acm.org>
Date: Sun, 16 Feb 2003 00:02:13 -0500
To: "Cutler, Roger (RogerCutler)" <RogerCutler@ChevronTexaco.com>
Cc: www-ws-arch@w3.org
Message-ID: <20030216000213.B15741@www.markbaker.ca>

On Fri, Feb 14, 2003 at 02:00:06PM -0600, Cutler, Roger (RogerCutler) wrote:
> The application layer is above the messaging layer, the transport layer
> below.  Examples of inhabitants of the application layer include ERP
> systems (like SAP), office applications (like Excel or InfoPath) and Web
> applications (like an ASP or JSP).  Examples of messaging layer
> implementations include Web services and ebXML.  Examples of transport
> layer implementations include HTTP and SMTP./

In addition to comparing this stack to ebXML, I think it would be useful
to compare it to the stack used in the IETF.

In that stack, as with the one described above, the top dog is the
application layer.  Beneath it is an oft-specified, yet unnamed layer
which roughly corresponds to OSI layers 5 and 6, and from what I can
tell, isn't too far from the common view of the "messaging layer".
Beneath that layer, is the transport layer.

That may not sound very different than what's described above, except
when you actually take a look at what IETF technologies fit where.
Consider, from top to bottom;

- HTTP is at the application layer
- BEEP is at the "messaging" layer
- TCP is at the transport layer

MB
-- 
Mark Baker.   Ottawa, Ontario, CANADA.        http://www.markbaker.ca
Web architecture consulting, technical reports, evaluation & analysis
Received on Saturday, 15 February 2003 23:59:33 GMT

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