defining required attributes 定义必要属性
Cardinality adherence for element data as well as for required attributes.
元素数据以及所需属性的基数性。
The required attributes for this step's parameters can be set to false if the parameters are optional.
如果参数是可选的,可以将此步骤的参数所需的属性设置为 false。
Application Management specifies required attributes and operations of objects managed by the container.
Application Management为容器管理的对象指定必需的属性和操作。
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