An input event might be raised by any inputprimitive, such as a mouse device, a stylus, or a finger.
输入事件可以由任何输入基元(如鼠标设备、触笔或手指)引发。
2
In the Request flow, drag a MessageElementSetter primitive onto the canvas and wire the inputprimitive to its input terminal and its output terminal to the callout node.
When building a mediation flow, there are instances where the output message structure from one primitive does not match the input message structure for the next primitive.