Ex 7.1 xml document

<?xml version = "1.0" encoding = "Utf-8"?>
<!DOCTYPE cars SYSTEM "cars.dtd">
<cars>
 <ad>
   <make>Toyoto</make>
   <model>Corolla</model>
   <year>2000</year>
   <color>black</color>
   <engine>
        <number_of_cylinders>2</number_of_cylinders>
        <fuel_system>4 stroke petrol</fuel_system>
   </engine>
   <number_of_doors>4</number_of_doors>
   <transmission_type>continously variable</transmission_type>
  
   <accessories radio = "yes"
                air_conditioner = "yes"
                power_window = "no"
                power_steering = "no"
                power_brake = "no">accessories </accessories>
 </ad>

 <ad>
   <make>Cheverlet</make>
   <model>Tavera</model>
   <year>2000</year>
   <color>red</color>
   <engine>
        <number_of_cylinders>4</number_of_cylinders>
        <fuel_system>4 stroke diesel</fuel_system>
   </engine>
   <number_of_doors>4</number_of_doors>
   <transmission_type>dual clutch</transmission_type>
  
   <accessories radio = "yes"
                air_conditioner = "yes"
                power_window = "yes"
                power_steering = "no"
                power_brake = "no">accessories</accessories>
 </ad>
</cars>