Returns the relation type name.returnthe relation type name.
Returns the role info (RoleInfo object) for the given role info name (null if not found).paramtheRoleInfoName role info namereturnRoleInfo object providing role definition does not existexceptionIllegalArgumentException if null parameterexceptionRoleInfoNotFoundException if no role info with that name in relation type.
Returns the list of role definitions (ArrayList of RoleInfo objects).returnan {@link ArrayList} of {@link RoleInfo}.