The matched function is like our prior visitor functions but takes a node type to search for at the beginning.
所匹配的函数类似于我们之前的访问者函数,但在开始时会获取一个要搜索的节点类型。
A split node indicates the beginning of the parallel routes.
一个分离节点表示平行路线的开始。
The additional start node visualizes the process beginning more clearly.
附加的开始节点能更清楚地显示流程的开始部分。
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