如果函数需要在一系列调用期间维持某些数据的状态，比如工作缓存或指针，那么调用者应该提供此数据。

If a function needs to maintain the state of some data over successive calls, such as a working buffer or a pointer, the caller should provide this data.

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语义缓存由互不相交的语义区域组成，每一个语义区域包括语义描述及其数据指针。

The semantic cache consists of disjoint semantic regions, and each semantic region includes a description and a corresponding data pointer.

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返回一个指向缓存中下一个数据的指针。

Apointr to the next data in the buffer is returned.

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返回一个指向缓存中下一个数据的指针。

Apointr to the next data in the buffer is returned.

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