The service requester needs to set this property value before invoking the service.
服务请求者需要在调用这个服务之前设置这个属性值。
The value of a promoted configurable property is set only on the promoted instance.
升级过的可配置特性的值只可在升级过的实例中设置。
To make the extension required, set the value of the lower property to 1; to make it non-required, set it to 0.
要使扩展成为必须的,设置下面的属性值为 1; 要设置它为非必须的,设置值为0。
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