通过将社区角色映射到域角色，可以保证将复合应用程序的一个用户分配给包含业务组件的映射的域角色。
Through the mapping of community roles to domain roles, it is guaranteed that a user of a composite application is assigned to the mapped domain roles of an included business component.
应用程序必须将用户标识映射为凭据。
The application has to map the user identity to credentials.
如果用户打算为应用程序增加其它数据库映射，则保存该字符串。
Save this string if you intend to add additional database maps to your applications.
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