--XXX XXXXXX XXXXX XXXXXXXXXXXX XXX XXX XXXXXX class XXXXX XXX XXXXXXXXXX XX XXXXXXXXXXX (black diamond). Again, XXXXXXXXXXXX owns XXXXXX. Think of it like XXXX, FleetManager XXXX --&XX; Fleets owns --> XXXXXXXX. Also the black XXXXXXX must be XX the FleetManager XXXX
--XXX, XXX XXXXXXXXXXXX for XXXXXXXXXXX XXXXXXX public class FleetManager and XXXXXX class XXXXX looks to XX: "X" XXX XXXXXXXXXXXX XXXX (XXXXX XXXX XX associated XXXX exactly 1 XXXXXXXXXXXX, can't have an unmanaged XXXXX) and "0..*" (FleetManager can XX XXXXXXXXXX XXXX 0 or more XXXXXX).