Web services have not exploited sufficient semantics and approaches to dynamic service-oriented operations. Software agents have been developed for these operations. Current efforts on integrating Web services and agents are predominantly concerned with enabling the agents in existing systems to request, provide or broker Web services. This paper presents the notion of agent-based Web services (AWS) and describes an integration framework that utilizes software agents' model to construct semantic and dynamic Web services. Essential concerns about the integration have been addressed. Basic AWS meta model and model-driven integrated development environment (IDE) have been developed. The IDE has been evaluated by a case study of an e-Marketplace service, reverse auction.
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