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我发现在以前的考试中,他要求我们写 DTD:
“传感器系统元素内部只有一个速度元素,紧接着是两个具有强制性位置属性的温度元素”
所以它是
<!ELEMENT sensor-system(velcoity,temperature+)>
他怎么会想要这么多温度?这甚至可能吗?我可以写吗还是不正确
<!ELEMENT sensor-system(velcoity,temperature,temperature)>
是的,别忘了像这样声明你的温度元素:
<!ELEMENT temperature (location)>