The Datafeeder retrieves alert content from a content source, the Alert Engine manages the alert subscriptions and trigger conditions, and a transport layer is used as the delivery mechanism to send the alert to any device.

• 其中Datafeeder 从内容源检索警示内容，警示引擎（alert Engine）管理警示订阅和触发条件，而传输层则作为将警示信息发送到任意设备的传送机制。