Here are the classes, structs, unions and interfaces with brief descriptions:

SignOn::AuthService	Represents signon for client application
SignOn::AuthSession	Represents a session to authentication plugin/server
SignOn::ConnectionManager
SignOn::DBusInterface
SignOn::Error	Definition for Signon error handling
SignOn::Identity	Represents a database entry for a single identity
SignOn::IdentityInfo	Contains identity information
SignOn::AuthService::IdentityRegExp	The class represents a regular expression
SignOn::SessionData	Data container to hold values for authentication session