此顺序是在引用主题中允许结构的子集，它允许语法、属性和部分的任何顺序。
This sequence is a subset of the allowable structures in a reference topic, which allows any sequence of syntax, properties, and sections.
主题DTD中的多数元素都包含一组统一的属性，使元素可以用作选择器、过滤器、内容引用基础设施和多语言支持。
Most elements in the topic DTD contain a set of universal attributes that enable the elements to be used as selectors, filters, content referencing infrastructure, and multi-language support.
使用subjectdef元素引用主题的公开标识，并用format属性指定主题定义格式。
You cite the public identifier of the subject with the subjectdef element and identify the subject definition format with the format attribute.
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