XMLPullParserAPI类似于StAX所提供的基于指针的API，可以通过分析解析器的状态获得上一个解析事件的信息，然后移动到下一个，依此类推。

The XML Pull parser API is similar to the cursor-based API provided by StAX; the parser state can be examined for information about the last parsed event, then advanced to the next one, and so on.

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注意：如果记录集对象不支持书签或不能向后移动指针，那么将产生错误。

Note: An error will occur if the Recordset object does not support bookmarks or backward cursor movement.

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整个函数将文件指针从当前位置向前或向后移动移动到一个新的位置。

This function moves the file pointer from its current position to a new position, forward or backward, specified by the number of bytes.

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整个函数将文件指针从当前位置向前或向后移动移动到一个新的位置。

This function moves the file pointer from its current position to a new position, forward or backward, specified by the number of bytes.

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