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Modern enterprise consists of complicate business systems. The enterprise service-oriented architecture (ESOA) becomes more and more mainstream for designing and implementing enterprise business systems. The purpose of this paper is to build a generic and abstract model of enterprise service-oriented architecture. The model consists of seven sets: services, service consumers, service data, service infrastructure, service processes, service management and service quality attributes. We formally define each set as well as relationships in ESOA and discuss their roles. Finally we conclude by comparing related models of ESOA and presenting the benefits of our model for both researchers and practitioners in ESOA.