There are lots of systems that follow this pattern, where you write some modules / components in source code then describe how they are connected using an external config file.
许多系统都遵循这种模式，在这些系统中，你编写一些模块/组件，然后通过一个外部配置文件定义他们之间的连接。
More often than not, you will deal with XML data originating from an external source-perhaps a flat file, perhaps a Web service, perhaps something else.
很多情况下您都需要处理来自外部源的XML数据——可能来自平面文件、Web服务或其他源等。
You may notice from the source code that the data in our model is coming from an external XML file.
您可能注意到了，在源代码中模型中的数据来自外部XML文件。
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