模型导航器需要更改的惟一一处是告诉导航器内容何时触发此内容提供程序。
The only other part of the model navigator that needs to be changed is to tell the navigator content when this content provider can be triggered.
下面的章节详细介绍了如何访问内容和标签提供程序的数据，以及如何显示模型导航器。
The following sections detail how we can access data for the content and label providers, then how we display the model navigator.
这里涉及创建一个内容扩展，此扩展可被导航器内容服务用于显示emf域模型。
This involves creating a content extension that can be used by the navigator content service to display the EMF domain model.
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