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Re: question: relation between WS-CDL and WSCI

From: Titi Roman <dumitru.roman@deri.ie>
Date: Sat, 17 Apr 2004 06:02:22 +0300
Message-ID: <017401c42428$68d68ec0$b96c9ad5@titi>
To: "Nickolas Kavantzas" <nickolas.kavantzas@oracle.com>
Cc: "WS-Choreography List" <public-ws-chor@w3.org>

Hi Nick,
Thanks for your answer. See just some questions/comments in-line that just
crossed my mind.

----- Original Message -----
From: Nickolas Kavantzas <nickolas.kavantzas@oracle.com>
To: Titi Roman <dumitru.roman@deri.ie>
Cc: Assaf Arkin <arkin@intalio.com>; WS-Choreography List
Sent: Thursday, April 15, 2004 8:14 PM
Subject: Re: question: relation between WS-CDL and WSCI

> See comments about WS-CDL below.
> --
> Nick
> >
> > As far as I understood and please correct me if I am wrong, WS-CDL
> > only "global model"(i.e. the multi-participant view of the overall
> > exchange) - this sounds to me as a static linking between web services.
> > about the dynamic linking between ws from the point of view if
> > coneversation?
> Why does the global model implies static linking? I am not sure I
understand this.
> And what is the dynamic linking between ws from the point of view of the
> coneversation? Can you elaborate on this more?

What I meant by this was that when you specify a choreography all the
participants are known a-priori (static linking).
What I miss is: I want to make a service accessible through the internet and
I want to describe in a language (hopefully WS-CDL) how it behaves when
someone uses it - note that I do not need a "global model" to do this since
I do not care who will use it (e.g. a "credit check" service will offer its
service to potentially thousands of travel agents - it is not the job of the
"credit check" service to conform to the thousands choreographies of the
travel agents, but is the job of the travel agents to discover the "credit
check" service and adapt their choreographies to the "non-global model"
choreography of the "credit check" service (i.e. dynamic linking)) - is it
possible to describe the way "credit check" service behaves in my scenario
in WS-CDL?
if yes, I personally find it very unintuitive in this, I suppose, very
realistic scenario(I understood from your mail that you and Steve have a
proposal related to this issue - is it possible for me to have access to
As you can see my example is in the context of section " Variation
2" of your current draft on requirements - while it can be the case for the
"credit check"  service (new credit bureau) to "join" the travel agent
choreography, it can also be the case (and I personally believe that it is
very realistic) for the travel agent to join the "non-global model"
choreography of the "credit check" service(which I tried to point out in the
above example).
Then why not just add another requirement(e.g. "A sub-choreography must be
generated and integrated in the "global model" choreography for each service
discovered and used o the fly") and try to tackle also this, I believe very
natural problem, in the choreography language?

Thanks a lot and I will surely read carefully the other comments from you
and Steve's last email and I'll come up with new questions ;-).
Titi Roman

> > What about the view of the overall message exchange as seen
> > from one participant? Isn't WS-CDL supposed to support also this view?
> >
> I have filled an issue for this in the Cambridge F2F and myself and Steve
> an action item to present our proposal to the group.
Received on Thursday, 15 April 2004 22:57:22 UTC

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