应用程序组的概念允许将用户组存储在数据库中而不是配置的LDAP中。
Application groups concept allowing you to store user groups in a database and not in the configured ldap.
存储并执行指令的能力（存储程序的概念）是通用计算机最重要的特性。
The ability to store and execute instructions, the stored program concept, is the most important property of a general-purpose computer.
开发人员可以使用一个相对稳定应用程序概念模型工作，并将这一模型映射到多种存储架构。例如不同的数据库管理系统的实现。
Developers can work with a consistent application object model that can be mapped to various storage schemas, possibly implemented in different database management systems.
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