In this invited talk we discuss the challenges associated with composing and pricing web services. We present the results of an online experiment, where subjects were confronted with a variety of choices and decisions relating to web service markets and service composition. Our analysis shows that people expect the price of a composite web service to be lower than the sum of the prices of the e...

By definition, web-services composition works on developing merely optimum coordination among a number of available web-services to provide a new composed web-service intended to satisfy some users requirements for which a single web service is not (good) enough. In this article, the formulation of the automatic web-services composition is proposed as several set-cover problems and an approxima...

We propose a framework for managing changes in Long term Composed Services (LCSs). The key components of the proposed framework include a Web Service Change Management Language (SCML), change enactment, and change optimization. The SCML is a formal language to specify top-down changes. It is built upon a formal model which consists of a Web service ontology and a LCS schema. The Web service ont...

Abstract Purpose A wide number of research efforts have been carried out over the last decades to assess and improve system sustainability. Different methods tools are increasingly implemented in product systems; nevertheless its application services other systems, which products combined, is rather limited. In this work, an approach sustainability systems composed (P + S systems) proposed two ...

Web service composition can be adopted to integrate information systems as complex composed processes. While interfaces of services are known at composition time, the quality of the composed process may depend on the ability of component services to react to unforseen situations, such as data quality problems and coordination problems. In this work, we propose an approach to analyze the quality...

In this paper, we present an approach to solve the problem of secure execution of semantic web service composition plans. The integrated components of this approach include our OWL-S service matchmaker, OWLS-MX, the service composition planner, OWLS-XPlan, and the security checker module for formally verifying the compliance of the created composition plan to be executed with given data and ser...