第二个操作符从不同的xml节点提取一些关系列值。
The second operator extracts a number of relational column values from various XML nodes.
为了在两个进程之间发送消息，您可使用修改后的消息传递操作符，在其中包含节点名称以及接收方的进程id。
To send messages between the two processes you use a modification of the messaging operator that includes the node name in addition to process id of the recipient.
为了在两个进程之间发送消息，您可使用修改后的消息传递操作符，在其中包含节点名称以及接收方的进程id。
To send messages between the two processes you use a modification of the messaging operator that includes the node name in addition to process id of the recipient.
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