次序规则是各种取代基按照优先顺序排列的规则
指定一个约束规则，确定属性之间的次序和选项。
Specify a constraining rule that determines the order and choice between attributes.
这些规则定义哪些元素是有效的、文档中元素的次序、属性的数据类型、一个元素是必需的还是可选的等等。
These rules describe, for example, which elements are valid, the order of elements within a document, the data types of attributes, whether an element is required or optional, and so on.
保持该次序是极其重要的，因为记号赋予器规则在文件中出现的次序就是应用标记规则的次序。
It is important to preserve this ordering because the order that tokenizer rules appear in the file are the order in which token rules are applied.
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