服务本身不是该模型中接受版本管理的实体。
图1表明服务规范是该模型中接受版本管理的实体。
Figure 1 shows that the service specification is a versioned entity in the model.
实现MBean类通常非常直接明了，因为MBean接口要反映现有实体或服务的属性和管理操作。
Implementing the MBean class is usually fairly straightforward, as the MBean interface is supposed to reflect the properties and management operations of an existing entity or service.
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