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Enhancing WSDL for Service Descriptions and Orchestration in Business Processes

This document outlines advanced strategies for defining service descriptions using WSDL, focusing on orchestration, security, and the relationship with ebXML CPP/CPA and tpaML. We explore the evolution of collaborations through various frameworks, emphasizing the need for clear interface definitions and sequencing of service usage. The paper addresses critical issues in service orchestration, including QoS challenges and the necessity for flexible transaction models. Insight is provided on refining service descriptions to distinguish core features from extensions, alongside clarifying querying capabilities and aligning with other W3C work items.

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Enhancing WSDL for Service Descriptions and Orchestration in Business Processes

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Presentation Transcript

  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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