可是，也有一些忧虑是出自一些使用数字9999标记文件结束的数字系统。

But there were also worries because some data systems used the digits 9999 to mark the end of a file.

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——写入 node 属性描述的一个节点的内容（XML 文件中开始和结束标记之间的文本）。

writes the content (the text between the start and end tag in an XML file) for the one node described by its node attribute.

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您可以在测试文件上进行实践，去掉开始和结束标记，熟悉因此显示的错误消息。

You might wish to experiment with your test files, and move the end tags and beginning tags, to become familiar with the resulting error messages.

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