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Subject: RE: [wsbpel] implicite links of the runtime engine (was: Implicit <sequence> macro)


The point about the Pi emulation of data was clearly rhetorical ;-)

The key point I was trying to make was that minimality is in the eye of
the beholder, and does not lead to a unique result.

The merger of the block structured and graph oriented control regimes is
actually a unique and useful characteristic of BPEL in that it puts to
bed a perennial debate in this area.  I think the cost in feature
overhead is pretty minimal for that benefit.

Satish

-----Original Message-----
From: Assaf Arkin [mailto:arkin@intalio.com] 
Sent: Wednesday, June 25, 2003 8:57 AM
To: Maciej Szefler
Cc: Satish Thatte; Ron Ten-Hove; Eckenfels. Bernd;
wsbpel@lists.oasis-open.org
Subject: Re: [wsbpel] implicite links of the runtime engine (was:
Implicit <sequence> macro)

Well said.

arkin

Maciej Szefler wrote:

>There is a big difference in degree between emulation of sequence with
flow and emulation of XML using pi calculus. For one BPEL does not
express pi, so to do so would involve expanding the spec (whereas
eliminating sequence reduces the spec). Second, for the purposes of
business processes, where the notion of structured data is integral to
the definition, it is only natural to not have to model XML data using a
slew of pi processes: doing so would unnecessarily complicate the
implementation of the BPEL engines and make direct reporting against
process state impossible (while eliminating sequence marginally
simplifies implementation, and has no impact on direct reporting
capabilities). This philosophy amounts to "as simple as possible,
keeping in mind the problem domain".
>
>-Maciej Szefler
>  
>




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