A Dynamic Web Service Composition Process Definition Meta-Model and its Application
动态服务聚合流程定义元模型及其应用

One of important issues of process-driven dynamic Web Services composition is supporting dynamic variation of Web Services.To satisfy this request the designing model of traditional workflow must be improved.This paper proposes the concept of SN and SG to adapt to the dynamic variation of Web Services,and proposes a meta-model of Web Services composition process definition to satisfy the need of dynamic Web Services composition process modeling.According to the meta-model,a new Web Services Composition Process/Resource model(WSCP/R-net)is proposed based on extended Workflow-net.WSCP/R-net effectively resolves the problems on uncertain activity option and dynamic variation of service in process model.The application of WSCP/R-net in Web service composition process modeling is illustrated in city emergency disposal project.