An XML document can have some empty tags that do not have anything inside and can be expressed as a single tag instead of as a set of beginning and end tags.
XML文档可以使用内部不包含任何内容的空标记，这些标记可以表示为单个标记，而不是一组开始和结束标记。
An XML document can have some empty tags that do not have anything inside and can be expressed as a single tag instead of as a set of beginning and end tags.
XML文档可以使用内部不包含任何内容的空标记，这些标记可以表示为单个标记，而不是一组开始和结束标记。
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