让我们开始从某个文件中读取一些行。

Start by reading some lines from a file.

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让我们编写一个输入函数来从文件中读取相应的行。

Let's write an input function to get the relevant lines from the file.

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例如，如果XML资料已内嵌于更大的文件中，且资料从文件的101行开始，您可能会想要指定读取器从100行开始。

For example, if your XML data were embedded in a larger document, and your data started on line 101 of the document, you may want to specify that the reader start at line 100.

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