interface Animal {

  // A simple attribute that can be set to any string value.
  readonly attribute DOMString name;
};

interface Person : Animal {

  // An attribute whose value cannot be assigned to.
  readonly attribute unsigned short age;

  // An attribute that can raise an exception if it is set to an invalid value.
  // Its getter behavior is inherited from Animal, and need not be specified
  // the description of Person.
  inherit attribute DOMString name;
};