关键词: 工作流, Web服务, 多视图, 服务质量, 模型

Abstract: Based on the workflow modeling technology, a multi-view service composition model named PRRD with personalized Qualicty of Service (QoS) requirements was proposed. The model exhibited four aspects, i.e. process model (P), service resource model (R), user requirement model (R) and relevant data of service combination (D). The process model extended the presentation capabilities of activity network diagram with the best readability. The resource model had better expansibility due to considering functions and non-functional properties. The demand model used both qualitative and quantitative descriptions to reflect overall service quality requirements with personalized characteristics. Finally, based on the PRRD model, a prototype system for Web Services composition modeling was implemented, and feasibility of the model was verified.

Key words: workflow, Web Services, multi-view, quality of service, models