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A series of business processes, based on Wf-XML, executing cooperatively and sharing information among customers, suppliers and business partners are used in electronic commerce. Wf-XML (Workflow-XML) is an asynchronous Web service protocol. A language defining XML-based protocol is suggested for the mutual linkage of the workflow engine. In this paper, the model is proposed to model the UML diagram on the resource model provided in Wf-XML to link different workflow engines. It facilitates understanding workflow for links and cooperation between enterprises.