Nested roles are equivalent to nested groups. Nested roles enable you to create roles that contain other roles and to extend the scope of existing roles. A nested role can itself contain another nested role. Up to 30 levels of nesting are supported
A nested role lists the definition entries of other roles and combines all the members of their roles. If an entry is a member of a role that is listed in a nested role, then the entry is also a member of the nested role.