无需在每个复杂类型定义中显式地引用属性组。
There is no need to explicitly reference the attribute group in either complex type definition.
一个元素列表，它为属性定义一组可能使用的值
A list of elements defining a set of possible values for the property
一个活动组件可以定义一组配置属性。
An activity component can define a set of configuration properties.
定义一组扩展程序可以提供给其他组件的属性。
Define a set of properties that your extender can provide to other components.
定义一组扩展程序可以提供给其他组件的属性。
Define a set of properties that your extender can provide to other components.
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