让我们看看一些Web应用程序的定义，以及这些定义的共同点。
Let's look at a couple of definitions of a Web application and see what's common among them. Here are three definitions obtained from an Internet search.
IBM portlet API将一个portlet应用程序的定义划分为一个portlet - app以及一个concrete - portlet - app，然而JSR 168 API仅仅定义了一个portlet - app。
While the IBM portlet API divides a portlet application definition into a portlet-app and a concrete-portlet-app, the JSR 168 API defines only one portlet-app.
您可以根据应用程序的需要定义任何角色。
You can define any roles you like, according to your application requirements.
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