I'm reading a book about DDD and i see an example domain that involves cars, engines, wheels and tires .
Above is the model as it is in the book . Customer is also aggregate root .
Having that model , there might be a case where the engine could have height, width and length attributes.
What happens when you need to attach a big engine on a small car ? The engine could not fit .
Is it a problem if the car checks for the engine attributes and allows it or not to be a part of the car ?
The engine has global identity (like you know each engine has a serial/manufacturer number). Maybe the engines need to be tracked by the manufacturer .
So I'm asking again , is it a problem if the car is using the engine's attributes to fit it inside (to allow it or not to be part of it) ?