This specifies a simple element content model that you can see matches the sample exchange in Listing 1 and Listing 2.
这指定了一个简单元素内容模型，与您在清单1和清单2中可以看到的示例交换相一致。
The specialized content model should always identify elements through the element entity rather than directly by name.
专门化内容模型应该总是通过元素实体而不是直接通过名称来标识元素。
To define an element is to define its name and content model.
定义元素就是定义元素的名字和内容模型。
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