Identifier标记为此超时请求提供唯一标识符，该值并不和节点本身的UID相关。
The identifier tag gives a unique identifier for this timeout request, which is not related to the UID of the nodes themselves.
此标识符必须在此节点部署到的代理实例内具有全局唯一性。
This identifier must be globally unique within the broker instance that this node is deployed.
您通过为两个节点配置相同的唯一标识符，从而将它们关联起来：在节点属性的Basic选项卡上指定的URL片段。
You associate the two nodes by configuring them both with the same unique identifier: a URL fragment specified on the Basic TAB of the node Properties.
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