Notice that there are no standard HTML structure tags.
请注意，这里没有标准的HTML结构标签。
and arethe new structure tags, which define the different sections of a webpage, andcome with their own and support standard and event HTML5 attributes.
和是新增的结构标签，用来定义页面的不同部分，支持独有的HTML5标准属性和事件属性。
XML documents are valid when the structure of the tags and their content is validated by an external schema file.
当 XML 文档的标记结构和内容得到外部模式文件的验证后，XML 文档就是正确的。
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