With AttributeDesignator, you specify an attribute by defining its name and type.

利用AttributeDesignator，可以通过定义属性名和类型来指定一个属性。

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You can also define an extends attribute to specify a relative path to the base requirement in order to create an extension.

您还可以一个 扩展 属性，从而为创建扩展确定一个基础需求的相对路径。

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Listing 4 shows a version of the singleton that USES a method instead of an attribute to specify the appropriate class.

清单4显示了使用方法而非属性来指定适当类的单例。

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