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WSDL / Business Process Stuff Breakout

WSDL / Business Process Stuff Breakout. Outline. “Service description” WSDL next steps WSDL issues Choreographing Web services. WSDL Relation to ebXML CPP/CPA. tpaML “interface definition” Binding Security / QoS “orchestration”

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WSDL / Business Process Stuff Breakout

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  1. WSDL / Business Process Stuff Breakout

  2. Outline • “Service description” • WSDL next steps • WSDL issues • Choreographing Web services

  3. WSDL Relation to ebXML CPP/CPA • tpaML • “interface definition” • Binding • Security / QoS • “orchestration” • tpaML is in the same space as WSDL + “WSEL” + business processs stuff + agreements • CPP/CPA = evolution of tpaML • CPP = Collaborating Protocol Profile, CPA = Coll. Protocol Agreement

  4. Issues • Boundary from top-down and bottom-up w.r.t. service descriptions • What’s horizontal vs. vertical • “Atoms” vs “molecules” • Overlap of CPP/CPA with UDDI • Are service descriptions queriable? • How do service descriptions relate to other W3C work items?

  5. Service Description: Moving Forward • Start with ebXML TP vs start with WSDL • ebXML TP has had a lot of work done on it • Bottom up approach is more likely to get adoption in the “Web” community • Need to identify high level approach and then look at options • Consensus on need for a service description WG

  6. Service Description & Sequencing • Service descriptions need to include information about proper usage of the service (w.r.t. sequencing) • Separate service interface descriptions from service usage

  7. Service Descriptions Requirements • What is core and what is an extension? • What extensions are “standard” extensions vs private extensions? • Description of a feature does not mean anything about how it will be supported by a specific service implementation

  8. “Service Description” Scoping • “Interface” definition • Sequencing • Does not indicate what happens; only possible usage of a set of operations of a service • Orchestration of services (both “local” and remote) • Defines a specific sequence or flow of activities

  9. Orchestration • Issues: • How do we get this to work without locking into QoS problems • Need flexible business transaction models for service orchestration to work • How do the various business transactions activities relate to transactional properties of business processes

  10. Orchstration Scoping • Scoping: • Static processes to dynamic processes • Who’s going to deal with transaction stuff

  11. Compositions as new services • What do services need to provide so that they can be composed? • Can behavior of compositions be described in an extensible way (not special case on failures for example)

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