The annotations beside each implementation document the condition (business rule) that triggers the selection of the corresponding implementation at execution time.
每个实现旁边的注释记录了在执行时触发对相应实现的选择的条件(业务规则)。
This could be used to alert an operator that a particular condition has occurred during message flow execution for example.
这可用于向操作员发出警报，例如，告诉操作员在消息流执行过程中出现了特定的情况。
Since the expected value at the selected path in the filter condition is only decided during execution, it needs to be defined as a variable.
由于过滤条件中选定的路径上的预期值是在执行时才确定的，因此需要将它定义为一个变量。
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