The collection of behaviors you can expect from built-in types constitutes a protocol they implement.
您可以预期的内置类型的行为集合构成了它们实现的一个 协议。
Create custom components for behaviors that you can't capture with the built-in components.
创建自定义组件来捕获内置组件不能捕获的行为。
Since XML has no built-in tag behaviors, you have to have style sheets to display it at all.
由于XML没有内嵌的标志行为，故你必须有样单来显示它。
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