在您创建的大多数信息交换包文档(Information Exchange Package Documentation, IEPD)中，您将需要编写一个扩展架构(extension schema)，用于添加对交换是惟一的类型和属性。

In most Information exchange Package Documentations (IEPDs) you create, you will need to write an extension schema that adds types and properties that are unique to your exchange.

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