A Header element is added, which simply identifies information about this particular validation file.
添加了Header元素，它用于识别有关此特定验证文件的信息。
These custom validators can then be invoked in the usual manner, through the XML validation file for each Action.
创建之后就可以以常规的的方式调用这些定制的验证器，即对每个 Action 执行 XML 验证文件。
It displays the results of the validation in a buffer below the file you are currently editing.
它会在当前正在编辑的文件下的缓冲区中显示验证结果。
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