我不理解以下代码中的标签":<>"。
clojure re-frame todomvc
(defn todo-app
[]
[:<>
[:section#todoapp
[task-entry]
(when (seq @(subscribe [:todos]))
[task-list])
[footer-controls]]
[:footer#info
[:p "Double-click to edit a todo"]]])
有人能帮我解决这个问题吗?