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// Here we define our base classes class Vehicle {} class Wheel {} // Here we define our subclasses class Bicycle { isA Vehicle; } class Unicycle { isA Vehicle; } // This is the "parent association" so to speak. // It defines the Vehicle to Wheel relationship // with as much abstraction as possible. association { 0..1 Vehicle vehicle -- 0..* Wheel wheel; } // Here, we'd like to extend the functionality of // the previous association to work with // subclasses of Vehicle, while utilizing as much // of the existing code as possible. // Specializations allow us to do this, since: // -> Bicycle and Unicycle extend Vehicle; // -> Wheel is part of the Wheel hierarchy; // -> The bounds on the left are not less specific // than the left bound of the parent // association; // -> The bounds on the right are not less // specific than the right bound of the parent // association; // -> Finally, the role names are the same. association { 0..1 Bicycle vehicle -- 0..2 Wheel wheel; } association { 0..1 Unicycle vehicle -- 0..1 Wheel wheel; } //$?[End_of_model]$? // Positioning class Bicycle { position 65 315 109 45; } class Unicycle { position 352 324 109 45; } class Vehicle { position 193 224 109 45; } class Wheel { position 188 35 109 45; } // @@@skipphpcompile - Skipped due to issue 701 // @@@skipcppcompile
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