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In a web service composition, an electronic contract (e-contract) regulates how the services participating in the composition should behave, including the restrictions that these services must fulfill, such as real-time constraints. In this work we present a visual model that allows us to specify e-contracts in a user friendly way, including conditional behavior and realtime constraints. A case study...
As the consensus of using web services as an alternative to traditional deployment models has been growing during the last years, also new techniques to face the new arisen problems have been developed. In this work, we present the design of a conference management system by using a composition of web services as deployment model. We bring our attention about the management of contributions observing...
This paper presents an enhanced derivation procedure to obtain a system of services, from a given choreography. In addition to the basic framework, we introduce several situations where nondeterminism appears and it is resolved by using a dynamic prioritized system. The priority policy is based on several parameters such as the request dispatching, the response time, the quality of the response, etc...
A Web Service is a self-describing, self-contained modular application that can be published, located, and invoked over a network, e.g. the Internet. Web Services composition provides a way to obtain value-added services by combining several Web Services. The composition of Web Services is, therefore, suitable to support enterprise application integration. WS-CDL (Web Services Choreography Description...
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