This class represents the authorizations for an action. It's associated to a label, a description, the bit in which flags are saved, and obviously the authorization array which is encapsulated in the RolesAuthorizations class. The bit which is used to store the authorization is 2^n where n is the number of the place you want to use. It's recommanded to begin with 1 (2^0 = 1) then 2 (2^1 = 2) then 4 (2^2 = 4) etc... In this class the select of Visitor level is not possible.