继而可以使用原型中的属性和函数，甚或重定义函数和属性。

You can then use the attributes and functions in your prototype, or even redefine the functions or attributes.

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对面向目标属性的最后一点重要说明是，一个良好的虚拟化系统应能够根据最终用户的特性来定义目标。

A final critical comment on goal orientation is that a proper virtualization system will enable goals to be defined in terms of end user characteristics.

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重定义和 include 很相似，但是如名称所暗示的，它允许重定义简单类型、复杂类型、元素组和属性组。

Redefine works much like include, but, as its name indicates, it allows you to redefine simple types, complex types, element groups, and attribute groups.

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