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.
虽然这么做会花费数个小时，但是通过验证可以发现任何缺失的源数据或文档，这时修复这些问题花费的代价比在将来任何时候都要小。
This may take several hours but will identify any missing source data or documentation at a time when fixing the problem will be cheaper than at any time in the future.
任何缺失的文档字段不是索引。
当然，如果某些任选信息在HTML文档中缺失，有关字段就留作空白，但这种情况在任何数据库中都是常见的。
Of course, if some optional information is missing from the HTML document, the associate fields will be left blank, but this is not uncommon in any database.
当然，如果某些任选信息在HTML文档中缺失，有关字段就留作空白，但这种情况在任何数据库中都是常见的。
Of course, if some optional information is missing from the HTML document, the associate fields will be left blank, but this is not uncommon in any database.
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