The characteristics and the attributes of EP and CL are analyzed which are static parts of a service and REL and RL are described by directed graphs which model all possible behavior of the service.

• 分析了端点、通信链接的特征与属性，二者属于业务的静态元素；使用有向图描述用户与通信链接的关联、通信链接之间的关联，二者构成业务的动态行为。