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Execution Semantics – Goal-based discovery (cont')

• Input
  
  • Service requester wishes to discover a list of SWS fulfilling its requirements provides them as a goal description using WSML.
    
• Output
  
  • A set of WSML Web Service description whose capability matches the goal is returned.
    
• Process
  
  • Message containing WSML goal is received and passed to the communication manager, which takes care of message persistence.
    
  • The goal is sent to discovery activity which evaluates whether a WSML Web service from the repository is capable of fulfilling the goal. It may need data mediation as its internal step.
    
  • The selection activity may be triggered to determine which of the discovered services to return to the service requester.
    
  • WSML Web service description is returned in a form of message to the requester by relying on the Communication Manager facilities.