For one thing, missing data is not explicitly indicated, but is simply marked by an absent line and time stamp.

一方面，没有显式地标明丢失的数据，而只是通过不存在的行和时间戳进行了简单的标记。

If a file is completely missing, data is garbled beyond recovery, or an essential element is absent in an XML document, that is when you interrupt your user's work.

如果一个文件完全丢失了，数据已经篡改而无法修复，或在XML文档中缺少必需元素，这时可以中断用户的工作。

Absent any other tables, you'd have to scan all the entries and test each data item.

没有任何其他表，你必须扫描所有条目和测试每个数据项。