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

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

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

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

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

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

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