Research has to be
done to find a system of evaluation of QoS (e.g., estimated response time, reliability,
expected output), combined with the financial evaluation.
Security.System
Related to the accounting system and its QoS, is the security system. Is the called
agent or Web service, really what it is supposed to be? In the static way of finding
and using Web services, the programmer checks the credentials of the called Web
service. In the case of, for example, dynamic workflows, the calling Web service
has to figure itself out if the called Web service is the right one. Therefore authentication
and authorisation should be managed by approved independent ???certifying???
0 Rabaey, Tromp, Vandenborre, Vand jck, and T mmerman
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agencies, so that the calling Web service can be sure that it will be using the right
(called) Web service.
Conclusion
The question was, by adding semantics to Web services, are dynamic executable
workflows possible? Can BPEL4WS be made dynamic, so that ad hoc, productive,
and administrative workflows can be designed and executed with the same
technology?
First the capability approach was discussed, and SOA is well suited to adopt this
approach.
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