最后，用时态映射定义的元组对双时态关系进行定义，并由此给出双时态关系代数运算的形式化描述。
Finally, bitemporal relation is defined as the set of the temporal mapping tuple, and the bitemporal relational algebra operations are described formally.
Erwin讨论了在领域模型中实现双时态(bi - temporality)的设计选择：使用一个时态数据库(temporal Database)或编写自己的代码。
Erwin discussed the design options for implementing bi-temporality in domain models by using a temporal Database or writing custom code.
同时针对双事件时态关联规则挖掘提出一个增量算法，并给出了实验结果。
To mine temporal association rules in two events, we propose a new increment algorithm. Moreover, their experiment results are given.
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