这个扩展点还用于定义类型映射器、标签提供程序和属性类别。

Also defined with this extension point are a type mapper, a label provider, and property categories.

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扩展了Flex UIComponent基类的Flex组件允许作为内联属性设置常见样式—换言之，即在MXML组件声明标签内(参见清单1)。

Flex components that extend the Flex UIComponent base class allow you to set common styles as properties inline-in other words, within the MXML component declaration tag (see Listing 1).

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