If you need to submit input data, use a tag with a real action attribute.
如果您需要提交输入数据，使用一个带真实动作属性的标记。
2
Change or differentiate the namespace only when you want to make a real, fundamental distinction that defines each element and attribute.
只有在希望对每个元素和属性的定义进行真正的、本质的区别时才改变或者区分名称空间。
3
You will notice that in many cases, the XML elements have generic name tags such as "Metric" and the real identifier is carried on the name attribute of the generic element.