Open Assembly diagram, and addEcho for both interface and reference.
打开组装关系图,同时为接口和引用添加echo。
2
To this, add a sequence activity that will be the outermost structural element required in the Echo process.
为此,请添加一个sequence活动,它将成为回送流程所要求的最外层的结构元素。
3
For the echo process, you need some steps to be taken in a certain sequence, so you add a sequence as the top-level activity activity and then populate it with a receive and reply later.