Now you can go ahead and add a sequence element to the process.
现在，您可以继续前进，向process添加sequence元素。
It has an empty content model because of its empty xs: sequence element.
它有一个空的内容模型，因为它的xs： sequence元素为空。
This is achieved by defining all operations called in a sequence within the sequence element, as shown in Listing 2 below.
这是通过在顺序元素中定义所有操作的顺序来完成的，如以下清单2所示。
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