Deploying the ADF Application - Oracle ADF 11gR2 Development Beginner's Guide - page 240

We create users in the server for applicaion roles. The users deined in the jazn-data.xml
file are displayed in the Users secion as shown in the following screenshot:
For example, the user John from the Operations
department is given an EMPLOYEE role that has the privilege
to view all the employee informaion, but modify only his
informaion. However, an employee Victor with an HR role
can view and edit informaion related to any employee except
deleing an employee record. An Employee named Matt
who is given an HR_ADMIN role can view, edit, and delete
any record from the employee database.
The permission for each of the iles in the applicaion is also conigured in jazn-data.xml .
jazn-data.xml is merged with the server as system-jazn-data.xml , which holds the
informaion related to the user roles, applicaion roles, and enterprise roles. If the organizaion
is huge then LDAP or other powerful user profile directories are used.