These backups can be used to restore databases to their proper state after data corruption events, such as software failures, hardware failures, bad application logic, and user errors.
当发生数据毁坏事故，例如软件故障、硬件故障、错误的应用程序逻辑和用户错误后，可以使用这些备份将数据库恢复到适当的状态。
An application's reliance on XML documents for data exchange and relational databases for data persistence are characteristics of the application's business logic (that is, its model).
应用程序依赖XML文件来进行数据交换以及关系数据库来提供数据永久性都是应用程序业务逻辑(也就是其模式)的特征。
To implement application logic by extracting subsets of data and sorting and rearranging this data, relational databases have SQL, and XML has XSLT and XQuery.
要通过抽取数据子集、排序并重新排列数据而实现应用程序逻辑，关系数据库具有 SQL，XML 具有 XSLT 和 XQuery。
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