Web services sub-team report CPPA June ’02 F2F Reston, Virginia.

Agenda Scope of the project Current sub-team WSDL overview CPA -> WSDL element mapping Rosettanet PIP3A4 example Open issues

Scope of the project Research how CPPA information can be integrated with following WS specifications* Web services description standard (WSDL) Web service messaging standard/s (SOAP, SOAP + WS Routing + WS Security, etc.) Web services choreography standard/s (IBM WSFL, MS XLANG, etc.) *in order of maturity/priority

Current sub-team Arvola Chan Dale Moberg Marty Sachs Pallavi Malu

WSDL overview Web Services Description Language similar in purpose to IDL, but in XML form Operational information about the service Service interface Access protocol Contact endpoint

WSDL overview *Where the service is located (service implementation definition) *What the service does (service interface definition) Service Implementation Definition Service Port Binding PortType Message Type Service Interface Definition

WSDL elements types: XML schema definitions used to describe the messages exchanged message: abstract definition of data being transmitted. Consists of logical parts, each of which is associated with a definition within some type system portType: set of abstract operations. Each operation refers to an input message and output messages. Support four types of operation: One-way, Request- Response, Solicit-response, Notification. binding: concrete protocol and data format specification for the operations and messages defined by a particular portType port: communication endpoint for a binding service: set of related ports from one service provider

WSDL -> CPA element mapping CPAWSDL - operations that the service can offer - operations that the service can invoke

WSDL -> CPA element mapping CPAWSDL Assumption: Vanilla SOAP binding (use of attachments will require MIME binding)

CPA -> WSDL element mapping One WSDL document per CPA CollarationRole element No element for notification and solicit/response operations Preliminary conclusion: There is sufficient information in the CPA to generate WSDL definitions for all the parties involved

Example Rosettanet PIP3A4 (from CPPA 2.0 appendices) Simplifying assumptions Asynchronous communication Acknowledgments/exceptions modeled as one- way/notification operations All operations of type one-way or notification Vanilla SOAP binding only Review example xsds

Open issues Project timeline Project deliverables Sub-team recruiting How to exploit WSDL extensibility constructs to achieve tighter integration How to deal with specifications that are not yet submitted to the standards bodies