要支持多个组，必须创建一个父组并在TRANSITION元素中指定该父组。

Multiple groups are supported only by creating a parent group and specifying that parent group in the TRANSITION element.

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组内的所有成员都以父节点所描述的方式相关吗？

Are all members of the group related in a way the parent nodes describe?

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例如，如果一个子元素继承自父元素，子元素的架构树将包含一个基于其类型的父元素组。

For example, if an element child inherits from element parent, the schema tree for child will include a group for parent that is based on its type.

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