OGoBase
                                  | 
   +----------+-------------------+
   |          |                   |
 OGoServer    |                   |
              |             OGoManager
     OGoDocument             |
     |         |             +-OGoAppointmentManager
     |  OGoOwnedDocument     +-OGoProjectManager
     |   |                   +-OGoPersonManager
     |   |                   +-OGoEnterpriseManager
     |   +-+                 +-OGoTaskManager
     |   | |                 +-OGoTeamManager
     |   | +-OGoAppointment  +-OGoAccountManager
     |   | +-OGoProject
     |   |
     |   OGoContact    
     |    |
     |    +-OGoPerson
     |    +-OGoEnterprise
     |
     +-OGoTask 
     +-OGoTaskHistory
     +-OGoTeam
     +-OGoAccount