如果导出操作不是单向的，则会出现响应流且该响应流必须产生一些虚设的响应，因为导入上的单向操作不会出现响应。
If the export operation was not one way there would be a response flow that would have to produce some fake response, since there is no response from the one-way operation on the import.
在清单5中，该流程提供了一个进出操作：该操作的输入消息被活动所消费，该操作的输出消息是通过活动来产生的。
In Listing 5, the process provides an in-out operation: the input message of this operation is consumed by the activity, and the output message of this operation is produced via the activity.
如果您使用Modeler的最终目标是向编排器导出自己的流程，那么您将必须在执行该导出操作之前切换到BPEL模式。
If you use the Modeler with the ultimate goal of exporting your processes to Choreographer, you will need to switch to the BPEL mode prior to performing the export operation.
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