restrictions on enumerations

[Guest thePete]

hi,i want to generate a xml file from a xsd file, and i was wondering if i somehow can restrict some selections, e.g. this relationship is given:vehicle type --> model --> paint --> orange | blue | rednow say, i want to restrict the car paint selection to red if the vehicle type is a car and the model is a convertible. it's blue, when it's a car and a sedan . now say it's orange, when it's a truck on all models.I'm not really sure, how i should model those constraints in a xsd file. Thanks for helping me out.