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Re: Choreography and REST

From: Christopher B Ferris <chrisfer@us.ibm.com>
Date: Mon, 12 Aug 2002 11:55:37 -0400
To: Paul Prescod <paul@prescod.net>
Cc: www-ws-arch@w3.org
Message-ID: <OF4A4AA949.580120A5-ON85256C13.0056A5EE-85256C13.0057695E@rchland.ibm.com>
You need to drill down a bit further than the one-sentence description
of EDOC.

I never claimed that EDOC-the-whole-thing is exclusively JUST about
choreography of process and hence can be equated to WSCI at some level.
However, business process is at the heart of what is needed to model 
distributed computing.


Christopher Ferris
Architect, Emerging e-business Industry Architecture
email: chrisfer@us.ibm.com
phone: +1 508 234 3624

Paul Prescod <paul@prescod.net> wrote on 08/12/2002 11:34:56 AM:

> Christopher B Ferris wrote:
> > 
> >...
> > 
> > My point was that you claimed that the OMG never felt the need for
> >  "choreography".
> > I believe that the EDOC RFP belies your claim.
> ????
> Let's define terms. Choreography is a way of describing the set of
> states that a multi-message stateful conversation can go through so that
> both participants know in advance what those states are.
> Now on to EDOC:
> "This RFP solicits proposals for a UML profile that supports the
> requirements for 
> driving an object-oriented design of an enterprise computing system to
> an 
> implementation in an enterprise distributed computing environment using
> an 
> enterprise-class component model." 
>  * http://cgi.omg.org/docs/ad/99-03-10.txt
> I do not see how the EDOC RFP attempts to address the "choreography
> problem". It does not even mention the problem!
> Further, I claim that CORBA does not have a choreography problem. Good
> CORBA object design will enforce correct choreography in an explicit,
> statically-checkable, design-time-available manner. With good CORBA
> object design, a standard Java or C# static type checker can prevent you
> from calling messages in the wrong order, because choreography is
> enforced by the structure of the data and Java/C# type checkers enforce
> proper data structures.
> Similarly, XML and RDF schema languages can enforce proper data
> structures *explicitly*, *at design time* and at runtime so choreography
> is not necessary.
> -- 
> "When I walk on the floor for the final execution, I'll wear a denim 
> suit. I'll walk in there like Willie Nelson, John Wayne, Will Smith 
> -- Men in Black -- James Brown. Maybe do a Michael Jackson moonwalk."
> Congressman James Traficant.
Received on Monday, 12 August 2002 11:59:04 UTC

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