该调用导致清单5中提供的警告，因为您在检查清单1中的数据，其中具有一个已知的文档引用缺失。
This call results in the warning provided in Listing 5 because you are checking the data in Listing 1, which has a known document reference missing.
可能要检查存储库中一定比例的文档，记录信息不正确或缺失的情况。
Perhaps you'll examine some percentage of documents in a repository and record instances of factually incorrect or missing information.
随着 XML 模式和文档类型的引入（旨在控制条目的添加和输入以及检查缺失的元素），本文中描述的设置会变得更复杂。
The setup described in this article can become more complicated with the introduction of XML schemas and doctypes to control the addition and entry of items and to check for missing elements.
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