Of course, the block of element declarations that are substitution group members can be managed in a schema module that is stored separately and included in a main schema.

当然，作为替换群成员的元素声明块可以在一个单独存储并包含在一个主模式中的模式模块中管理。

youdao

Also notice the use of group selectors, where two or more selectors are grouped together to have the same style declarations.

还要注意组选择符，也就是两个或更多的选择符组合在一起，使用相同的样式声明。

youdao