Create a DTD for catalog of cars, where each car has the child elements make, model, year, color, engine, no_of_doors, transmission_type and accessories. The engine element has child elements no_of cylinders and fuel system. The accessories element has attributes radio, air-conditioning, power-windows, power_steering and power_brakes. Each of which is required and has possible values yes and no.Entites must be declared for the names of popular car makes.

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