In this case, the selector is the ancestor element name followed by the descendant element name.

在这种情况下，选择符是祖先元素名后面跟着后代元素名。

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The template rule simply looks in the class attribute for the ancestor element name, and renames the current element to match.

模板规则只需要查看 class 属性中的祖先元素名，然后重命名当前元素以与其匹配。

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Omit all redundant namespace declarations (those that have already been declared in an ancestor element, and have not been overridden).

省略所有多余的名称空间声明(已经在祖先元素中声明而且没有被改写的名称空间)。

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