The relations do not impose any direction of evaluation and can be executed in multiple directions, which can be useful when you're dealing with round-tripping issues.
关联没有指定评估的任何方向，它们可以在多个方向下执行，这在你处理双向问题时是很有用的。
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This enables a standard, straightforward, round-trip friendly environment for business analysts as well as engineers dealing with the runtime representation of a process.