/**
  * Constructor
  * @param string $name name of the corresponding class
  * @param string $type either "has" or "composed_of"
  * @param string $class the name of the class related
  * @param epClassMap
  */
 public function __construct($name, $type, $class, $is_many = false, $inverse = false, $class_map = false)
 {
     parent::__construct($name, $type, $class_map);
     $this->setIsMany($is_many);
     $this->setClass($class);
     $this->setInverse($inverse);
 }