使用notdefined属性控制组件可见性
本文介绍如何通过notdefined属性来控制特定组件或操作在某一对象类型及其子类型中的可见性和有效性。该方法允许配置文件隐藏继承自父级范围的元素。
关键词“notdefined”用来确定当前的action或component在当前的scope（即r_object_type）中是否有效，为true则无效。用来屏蔽action或component从父类型向当前子类型的应用。开发指导文档中有如下一段话：
1.About Component:
notdefined: Configurations can hide elements that are defined in the parent scope by using the
notdefined attribute. Refer to Hiding a component for specific contexts, page 252 for more information.
In the following example, the checkout component is not available for folders:
<scope type='dm_folder'>
<component id="checkout" notdefined="true"></component>
</scope>
2.About Action
If an action definition is scoped to a specific object type, the definition applies to subtypes of the type.
To turn off the action for certain subtypes, create a scoped definition for the subtype and use the
notdefined attribute. In the following example, the checkout action does not apply to folders:
<scope type='dm_folder'>
<action id="checkout" notdefined="true"></action>
</scope>
1.About Component:
notdefined: Configurations can hide elements that are defined in the parent scope by using the
notdefined attribute. Refer to Hiding a component for specific contexts, page 252 for more information.
In the following example, the checkout component is not available for folders:
<scope type='dm_folder'>
<component id="checkout" notdefined="true"></component>
</scope>
2.About Action
If an action definition is scoped to a specific object type, the definition applies to subtypes of the type.
To turn off the action for certain subtypes, create a scoped definition for the subtype and use the
notdefined attribute. In the following example, the checkout action does not apply to folders:
<scope type='dm_folder'>
<action id="checkout" notdefined="true"></action>
</scope>
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