<\body> The additional layer allows you to specify read, write and administration permissions for database entries. There are two main types of users of databases: individual users and groups. Groups may delegate permissions to individual users or other groups. In addition, there are two special users (or ) and (or ). <\explain> <|explain> Evaluate the using the permissions of the specified . <\description> >Specifies a pseudo for the user. Notice that should specify the full name. , , >Ownership and read/write permissions for an entry. , , >Delegate group permissions. <\explain> <|explain> The actions only succeed when the current user has the appropriate permissions. <\explain> <|explain> Only values are returned for which the current user has appropriate permissions. <\explain> <|explain> Check whether a user with identifier has a given permission for the entry with identifier .