You will then learn how to create a more complex extension which changes the functionality of an existing Ext JS class and adds some new features.

然后，您将学习如何创建一个更复杂的扩展，可以修改一个已有 Ext JS 类的功能以及添加一些新特性。

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Listing 28 shows an example of an entry with a complex, unknown extension element.

清单28展示了一个带有复杂的未知扩展元素的条目示例。

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Another extension situation is where you have a complex type that is semantically equivalent to a NIEM type but you need to alter or add to it in some way.

另一个扩展情形是，您具有一个语义上等价于niem类型的复杂类型，但是需要在某些方面做修改或者添加内容。

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