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—Web Services are the most famous implementation of service oriented architectures that has brought some challenging research issues. One of these is the composition, i.e. the capability to recursively construct a composite Web service as a workflow of other existing Web services, which are developed by different organizations and offer diverse(More)
With the increasing number of services, the need to locate relevant services remains essential. To satisfy the query of a service re-quester, available service providers has first to be discovered. This task has been heavily investigated from both industrial and academic perspectives based essentially on registers. However, they completely ignore the(More)
In this work we address the issue of selecting and composing Web Services (WSs) considering functional requirements and transactional properties. We formalize the WS composition problem using the user query, the transactional properties of WSs and the composite WSs definition. We extends Colored Petri Net (CPN) formalism to incorporate transactional WSs(More)
Service discovery and selection approaches are often done using a centralized registry-based technique, which only captures common Quality of Service criteria. With more and more services offered via social networks, these approaches are not able to evaluate trust in service providers and often fail to comply with new requester's expectations. This is(More)