You can identify a primary subject with the href attribute of the topicsubject element, which also contains subjectref elements for the secondary subjects.
可以用topicsubject元素的hre f属性来表示主要主题，这个元素还包含subjectref元素来表示次要主题。
You cite the public identifier of the subject with the subjectdef element and identify the subject definition format with the format attribute.
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。
Notice that value specified for realm under run-as-subject matches the name attribute of the realm element in Listing 11.
请注意，为run - as - subject下的realm指定的值与清单11中的realm元素的name属性匹配。
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