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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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Presentation Transcript
outline
Outline
  • “Service description”
    • WSDL next steps
    • WSDL issues
  • Choreographing Web services
wsdl relation to ebxml cpp cpa
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
issues
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?
service description moving forward
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
service description sequencing
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
service descriptions requirements
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
service description scoping
“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
orchestration
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
orchstration scoping
Orchstration Scoping
  • Scoping:
    • Static processes to dynamic processes
    • Who’s going to deal with transaction stuff
compositions as new services
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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