Publishers typically add a topic header to the message that classifies the message according to the topic model or classification scheme of the notifications.
发布者通常向消息添加一个主题头部，根据通知的主题模型或分类模式确定该消息的类别。
The Administration API allows you to load definitions of state machines to be used to model the life cycle of governed entities, and to load classification systems described in OWL.
该管理API允许您加载将用于对所治理实体的生命周期建模的状态机定义，以及加载owl中描述的分类系统。
If you remember from the classification method, only a subset of the attributes are used in the model.
在分类方法中，只有属性的一个子集用在了模型中。
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