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RE: Dubray paper comments + questions

From: Assaf Arkin <arkin@intalio.com>
Date: Tue, 25 Feb 2003 19:56:15 -0800
To: <jdart@tibco.com>, <public-ws-chor@w3.org>

> -----Original Message-----
> From: public-ws-chor-request@w3.org
> [mailto:public-ws-chor-request@w3.org]On Behalf Of Jon Dart
> Sent: Tuesday, February 25, 2003 3:25 PM
> To: public-ws-chor@w3.org
> Subject: Dubray paper comments + questions
> It would be interesting to see in more detail whether, and how,
> something like BPEL4WS could be fit into this framework - I understand
> that they're fundamentally different approaches, but to the extent
> that they're attacking the same problem, it ought to be possible to
> take a BPEL4WS model and re-express its essentials in this framework.

That of course depends on what you mean by BPEL4WS. Are you talking about
the orcherstration part? I believe JJ will confirm that BPEL4WS could be
used for the orchestration part, but then I guess his intention is to allow
any number of implementations (BPEL, BPML, Java, C++, etc).

If you are talking about the choreography part then there's some mismatch
between the model used by BPEL4WS (and also other specs) and JJ's proposal
(and also BPSS).

BPEL4WS, BPML, WSCI, etc are based on processes defined for each
communicating agent, dating back to the model proposed in CSP and later
refined in pi-calculus and other works in that space. BPSS and EBPML prefer
to express processes as a centralized sequence of exchanges and then each
agent has to derive its process by extracting all activities related to some

I think there's conversion from one to the other, but I don't have evidence
that you can move from the CSP model to the centralized one and back without
losing some information.


> There is mention at the end of the paper of three planned followup
> papers - are any of these available?
> --Jon
Received on Tuesday, 25 February 2003 22:57:43 UTC

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