1. Liaison Report to WS-BPEL Technical Committee of Oasis
Martin Chapman,
Steve Ross-Talbot
7th December 2003

2. Divergent
We have spent about 6 months (from March to August) in a divergent phase.
Requirements gathering
Use case harvesting
Scoping
7th December 2003

3. Convergent
We have spent about 4 months (from August to December) in a convergent phase.
Requirements publication
What is a CDL? How would I use a CDL? Use cases, CSF analysis, requirements
Appointment of spec editing team
Meta model
Basic language design
Mapping to requirements
7th December 2003

4. What is it a CDL? A CDL is a choreography description language
A multi-party contract between services are the users of those services
A contract is a technical contract that describes external observable behaviour
A client that conforms to a contract is guaranteed to interoperate correctly
7th December 2003

5. What can I use a CDL for?
Generation of the necessary executable code skeletons
Aid the testing of Web Services through the generation of test messages
To police multi-party contractual behavior
To show the absence (or presence) of deadlocks and livelocks in the behavioral contract
7th December 2003

6. What benefits do I get from a CDL?
enable more robust Web Services to be constructed
effective interoperability of Web Services through behavioral multi-party contracts
reduce the cost of implementing Web Services by ensuring conformance to expected behaviour
increase the utility of Web Services as they will be able to be shown to meet contractual behavior
7th December 2003

7. W3C Choreography
We have moved significantly further forward with respect to requirements and language design
We expect to deliver a revised draft of the requirements document before the year end (in review)
We expect to deliver a base specification early next year (in review)
7th December 2003