The poll results and the real-time trading data are dynamic elements that are unknown until run time, but elements that should be added or updated when the server side sends a signal.
We signal the CNF when we will be able to display the domain model we described in our classes by adding and elements to the navigator content extension.
通过将和元素添加到导航器内容扩展中，当能够显示类中所描述的域模型时，我们可以向CNF发出通知。
3
Even if the sour-sensing cells signal that the carbonation is sour, there are more elements to the process of actually tasting, say, soda water.