这些元素可以让聚合feed的消费者能轻易通过程序判定一个聚合的每个组件的特征。
These elements allow consumers of Aggregate feeds an easy way to programmatically determine the characteristics of each component of an aggregate.
Web 浏览器和其他客户机使用这些元数据决定如何处理该文件，比如判定本身能否显示它还是要传递给帮助器程序。
Web browsers and other clients use this metadata to decide how to process the file -- for example, to determine whether they can display it natively or have to pass it to a helper application.
应用程序服务器作出基本内容判定，并且在不等待客户机请求的情况下将数据推到手持设备。
The application server makes basic content decisions and pushes data to the handheld device without waiting for the client s request.
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