Publish / Subscribe scheme based on the event model ( also called Event Notification scheme ) supports many-to-many communication and provides the loose coupling of interaction in the aspects of time, space, and synchronization required in the large-scale distributed event services. 该模型支持发布者和订阅者在时间、空间和同步方面的非耦合以及多对多的通信模式,从而满足大规模分布事件通知服务的基本要求。