Service Combinators for Web Computing
IEEE Transactions on Software Engineering
IEEE Intelligent Systems
Towards patterns of web services composition
Patterns and skeletons for parallel and distributed computing
A Petri net-based model for web service composition
ADC '03 Proceedings of the 14th Australasian database conference - Volume 17
QoS-Aware Middleware for Web Services Composition
IEEE Transactions on Software Engineering
Computer
Current Solutions for Web Service Composition
IEEE Internet Computing
Towards aspect weaving applications
Proceedings of the 27th international conference on Software engineering
Extending BPEL for Run Time Adaptability
EDOC '05 Proceedings of the Ninth IEEE International EDOC Enterprise Computing Conference
Towards a Policy-Driven Framework for Adaptive Web Services Composition
NWESP '05 Proceedings of the International Conference on Next Generation Web Services Practices
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Web services have played an important role in the development of distributed systems. In particular, the possibility of composing already implemented web services in order to provide a new functionality is an interesting approach for building distributed applications and business processes. The possibility of dynamically composing web services is also apparent. Current approaches address to this point, but they do not adopt established specifications, like WS-BPEL, as they usually propose modifications in the rules of business process specifications by imposing more difficulties to implement the system. This paper proposes a policy-driven approach for enabling web service adaptability through a semantic modification in the invocation primitive of WS-BPEL, whilst mantains its syntax unaffected. Hence, programmers may define dynamic web service compositions without changing the source code. The approach has been applied to a loan approval system in order to illustrate it.