它必须出现在其下方。
如果它必须出现在模型中,但又被抑制了,那么要考虑在该级别上使用汇总函数。
If it has to be in the model and it is suppressed consider using the summarizing function on the level above.
它必须出现在文档的开始(即,在第一个元素之前),并且包含几个所谓的伪属性。
It must appear in the prologue of the document (before the first element, that is), and it contains several so-called pseudo-attributes.
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