本文介绍了一个基于工作流的web 服务组合系统，这个系统为说明组合服务的流模型和用户对组合服务约束提供了环境。在web 服务资源分配的约束下进行工作流建模和进度安排，并扩展它使其具有发现服务的功能。在组合服务建模中，系统引导用户选择相关的服务类型。在引导功能和发现服务阶段都利用了基于本体的语义服务信息。关键词：动态web 服务组合，资源选择，约束满意问题，语义web 服务Abstract：In this work, we present a web service composition system that provides an nvironment for specifying the flow model of the composite service and the user's constraints on he composite service. We adopt our previous work on workflow modeling and scheduling under esource allocation constraints for web service composition and extend it with service discovery unctionalities. In modeling the composite service, the system guides the user for selecting the elevant service types. In both guiding functionality and the service discovery phase, ntologybased semantic information of the services is utilized.Keywords：Dynamic Web Service Composition, Resource Selection, Constraint SatisfactionProblem, Semantic Web Services
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