The base element is "root"; under "root" are "realms" and "policy".

Under "realms" is "realm". Under "realm" are "users" and "roles".

Under "users" is "user", which contains "roles" and "permissions". "Roles" contains "role". "Permissions" contains "permission.

The "roles" link under "realm" contains "role". "role" contains "users", "roles", and "permissions". "users" contains "user". "roles" contains "role". "permissions" contains "permission." is identical to the "roles" node under "user".

Under "policy" are "principal-classes" and "permission-classes". Under "principal-classes" is "principal"; under "permission-classes" is "permission".