假设我们想要一串正的随机数字流，它比服从向后参考约束的数字流要小。

Suppose we want a stream of positive random Numbers less than one that obey a backward-looking constraint.

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这个示例中，当数字流中产生小于0.1的数字时，我们将简单地结束它。

For the examples, we will simply end the stream when a number less than 0.1 is produced.

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标识符与数字流之间的分配关系由一个分配表定义并且能够随时间而变化，由此允许进行动态复用。

The allocation of an identifier to a digital stream is defined by an allocation table and can vary over time, in such a way as to enable dynamic multiplexing.

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