...是一种特殊的分组。这种方式的流分组意味着由元组的生产者决定元组的消费者的接收元组的任务。直接分组只能在已经声明为直接流（Direct Stream）的流中使用，并且元组必须使用emitDirect方法来发射。
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直接流端口和直接关系的最优化代码，以最优化初始化和为这些构建生成代码的数量。
Optimized code for direct flow ports and direct relationships to optimize the initialization and amount of code that generates for these constructs.
因为解析器已经直接连接了用户，AXIOM退出了，就是说所有信息都从低层的流直接流向用户。
Since the parser has thus far been connected directly to the user, AXIOM has been out of the loop — meaning all information has been flowing directly from the underlying stream to the user.
所有的状态信息可以直接从流读取器获得，不需要创建额外的对象。
All state information is available directly from the stream reader and no extra objects are created.
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