包含输入流，从最初可选的输入数据开始。

Contains an input stream, positioned at the start of the optional input data.

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假定某个用户需要从XML输入流中获得第一个人的元素值，AXIOM构建的对象模型将一直包含到元素结束的内容，而让其他内容保留在流中。

Suppose a user needs to get the value of element of the first person from an XML input stream, AXIOM builds the object model up to the end of element and leaves the rest in the stream.

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