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RE: Simple Choreography composition suggestion

From: Burdett, David <david.burdett@commerceone.com>
Date: Fri, 18 Jul 2003 14:02:53 -0700
Message-ID: <C1E0143CD365A445A4417083BF6F42CC053D1C10@C1plenaexm07.commerceone.com>
To: "'Ugo Corda'" <UCorda@SeeBeyond.com>, "Burdett, David" <david.burdett@commerceone.com>
Cc: public-ws-chor@w3.org

Ugo

My guess is that the supplier, and only the supplier, decides when to invoke
the invoice, scheduling and shipping web services. If this is the case then
the supplier is in control and the supplier, who is implementing the service
will know it.

The real question is does the purchaser need to know anything about the
invoice, scheduling and shipping services directly (i.e. not via the
supplier), if they do, then they are one choreography, if only the supplier
has the whole picture then the supplier is in control.

Not sure this is answering your question, but really I am saying that you
understand the implementation of the services that you implement, i.e. the
supplier knows about the services the supplier implements.

David

-----Original Message-----
From: Ugo Corda [mailto:UCorda@SeeBeyond.com]
Sent: Friday, July 18, 2003 1:48 PM
To: Burdett, David
Cc: public-ws-chor@w3.org
Subject: RE: Simple Choreography composition suggestion


David,

> This all boils down to what I see as being the key differentiator of a
> choreography from a (business) process which is that with a choreography
> there is no single process that is in complete control - therefore the
> processes involved have to "cooperate". On the other hand with a process
> there is a single entity in control and therefore you have a business
> process instead which can be implemented using languages such as BPEL.

What if I just look at the supplier, invoice, scheduling and shipping web
services exchanging messages among them. How do I know that the supplier is
in charge (assuming I don't know it's actually implemented as a BPEL
process)?

Your distinction seems to be based on knowing the internal implementation of
the web services involved, which I thought was outside of choreography's
scope.

Ugo
 
Received on Friday, 18 July 2003 17:02:55 GMT

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