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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)
Web services composition has been gaining interest over the last years as it leverages the capabilities to offer complex operations resulting from the aggregation of Web services offered by different organizations. As composite Web services are often long-running, loosely coupled and cross-organizational applications, advanced transactional support is(More)
An important problem in Web services composition process is optimal selection of services meeting the user functional requirements (tasks of a workflow) and ensuring a reliable execution of the composition. Therefore, non-functional properties of services such as their transactional behavior as well as their Quality of Service (QoS) must be considered. In(More)
Building applications dynamically from individual services offered by different organizations is one of the opportunities that Service-oriented Architecture (SoA) provides. With increasing number of providers, there is a choice among several functionally equivalent services resulting in a need to select the most appropriate ones in terms of Quality of(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)
• Let be Q = (I Q , O Q , R Q) a user query with:-I Q a set of input attributes,-O Q a set of output attributes and,-R Q an execution risk indicating if the obtained results can be compensated (semantically undone) or not by the user. • In the registry, each Web service (WS) is described (using OWLS) by its:-functional property (i.e. set of input and output(More)
Web service composition is the capability to recursively construct a value added service by means of picking up existing services. An important step in the composition process is the selection step, which includes choosing services located in repositories. The selection approaches of Web services need to consider their specifics which raises important(More)
The recent approaches for Web services composition tend to integrate heterogeneous business processes executed in Peer-to-Peer networks. In such networks, component Web services are invoked on independent peers and are orchestrated according to the transactional requirements defined by the designers or the users of the composite Web service. Since component(More)