可以将资源直接嵌入应用程序，或从外部文件加载它们。
You can embed them directly in the app or you can load them from an external file.
甚至可以从位于用户机器或者服务器上的外部XML文件中加载数据模型实例。
You can even load data model instances from external XML files loaded on the user's machine or the server.
它还会触发额外请求来加载外部引用。
It also triggers additional requests to load the external references.
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