指定复合属性，见图10。输入CUSTOMER作为Business object name。

Specify the composite properties as shown in Figure 10. Type CUSTOMER for the Business object name.

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该模型引入复合属性表达式和复合权限的概念，制定授权约束规则，为用户分配多组角色。

It introduces notions of composite attribute expression and composite permission, defines different multiple role groups and makes a finite set of rules to assign user to roles.

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聚合属性对于复合属性集非常重要：它必须要为类的属性设置成 Composition 并且为元类的原型类型设置为 Shared 。

The Aggregation property is important for complex types: it has to be set to Composition for attributes of a class type and Shared for attributes of metaclass or stereotype.

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