这些对象实例就是Service规范类中的订货方和运送方属性。
These object instances are the orderer and shipper properties in the Service specification class.
该服务规范包括两个角色：发货方和订货方。
The service specification consists of two roles: invoicer and orderer.
服务规范中的 InvoicingService 活动为使用服务操作指定了协议，在订货方和发货方角色之间能够发生的实际交流。
The InvoicingService activity in the service specification specifies the protocol for using the service operations, the actual communication that can occur between the orderer and invoicer roles.
应用推荐