Fw: input for discussion about abstract processes

[Diane Jordan <drj@us.ibm.com>]

I'm reposting to the subgroup so this
gets into the archives.  I've added Ivana and a couple others I missed
as members of the group.    

Regards, Diane
IBM  Dynamic e-business Technologies
drj@us.ibm.com
(919)254-7221 or 8-444-7221, Mobile: 919-624-5123

----- Forwarded by Diane
Jordan/Raleigh/IBM on 06/04/2004 03:55 PM -----

"Trickovic, Ivana" <ivana.trickovic@sap.com>

06/04/2004 09:25 AM

To	"'Philip.Rossomando@unisys.com'" <Philip.Rossomando@unisys.com>, Alex Yiu <alex.yiu@oracle.com>, Satish Thatte <satisht@microsoft.com>, John Evdemon <jevdemon@microsoft.com>, Diane Jordan/Raleigh/IBM@IBMUS, Frank Leymann <LEY1@de.ibm.com>, ygoland@bea.com, nickolas.kavantzas@oracle.com, Ugo Corda <UCorda@SeeBeyond.com>, "Monica J. Martin" <Monica.Martin@Sun.COM>, Ben Bloch <ben_b54@hotmail.com>, sundari.revanur@oracle.com, ashwini.surpur@oracle.com, Martin Chapman <martin.chapman@oracle.com>, Jeff Mischkinsky <jeff.mischkinsky@oracle.com>, Ismael Ghalimi <ghalimi@intalio.com>, sallystamand@yahoo.com, tony.fletcher@choreology.com, dieterkoenig@de.ibm.com, GRitzinger@novell.com, Robert.Haugen@choreology.com, frank.ryan@active-endpoints.com
cc	"Dillman, Frederick" <Frederick.Dillman@unisys.com>, "Malhotra, Sumeet S" <Sumeet.Malhotra@unisys.com>, "Trickovic, Ivana" <ivana.trickovic@sap.com>
Subject	input for discussion about abstract processes

Unfortunately, I am not able to join today's conference
call due to another appointment. Nevertheless, here is my input for the
work on BPEL abstract processes. Attached please find a document explaining
the proposed solution for issue 99.

 <<Issue99_Explanation.pdf>> 

Also I would like to briefly comment how BPEL abstract processes complement
WSDL and list a few requirements for BPEL abstract processes. 

A Web service may implement a set of operations which are not independent;
that means the ability to execute an operation may depend on the outcome
of another operation of the service. For example, a Travel Agent service
may implement operations such as makeReservation, changeReservation, and
cancelReservation, which depend on each other - a reservation may be changed/canceled
only after it is created. At the moment, WSDL is primarily used for describing
Web services, although it is adequate only for simple Web services, such
as those used for simple information retrieval (e.g. getWeatherForecast).
The language does not provide features for describing relationships between
multiple operations offered by a Web service, which is critical for complex
Web services (usually called stateful or conversational Web services).

Abstract description of behavioral aspects of Web services is needed so
service consumers can understand the way how to interact with Web services.
In this sense, these behavioral aspects complement the WSDL abstract interface.

Behavioral aspects include:
                
1.                
Order in which messages may be produced and consumed
                
2.                
Way in which the content of exchanged messages influences subsequent message
exchange(s) 
                
3.                
Mechanism for associating different messages (or message instances) to
the same conversations (since the same service may be engaged in different
conversations at the same time with the same or different services)
                
4.                
Dynamic participation - ability to identify the target Web service at run-time

The following paper ("Using BPEL4WS in a UDDI registry") looks
at the relationship between WSDL, UDDI and BPEL abstract processes and
suggests how BPEL abstract processes can be used in a UDDI registry
<http://www.oasis-open.org/apps/org/workgroup/uddi-spec/download.php/6407/uddi-spec-tc-tn-bpel-20040415.doc>


Regards,

Ivana

Issue99_Explanation.pdf