Abstract
Most methods that have been proposed to solve the problem of web service composition only consider input and output parameters of services in order to solve the composition problem. However, there are other factors that affect composition and execution of composite services such as constraints. Constraints can be used to express customer requirements on services features. Additionally, most real-world web services have constraints that specify their limitations and use restrictions. Constraint verification has significant impact on composition and execution of composite services. In particular, run time verification of service constraints can result in the failure of the execution of composite services and eventually waste computational resources. Such failures can not always be predicted as the verification of some services depends on execution effects of other services inside a composite plan. In this paper, we focus on verification of constraints during the composition and execution of composite services.
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