更确切地说，它们侦听信道中来自用户的符合特定格式的消息。
Rather, they listen for messages from users in the channels that fit a specific format.
规范化消息格式常常需要来自不止一个物理表的数据。
Canonical message formats often require data from more than one physical table.
另一方面，生成的消息文件则以ebcdic格式存储来自导入操作的所有消息。
On the other hand, the generated messages file store all messages from the import operation in EBCDIC.
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