code: def clear_display_name(self):
          
          if (self.get_display_name_metadata().is_read_only() or
                  self.get_display_name_metadata().is_required()):
              raise errors.NoAccess()
          self._my_map['displayName'] = dict(self._display_name_default)
docs: Clears the display name.
  
          raise:  NoAccess - ``Metadata.isRequired()`` or
                  ``Metadata.isReadOnly()`` is ``true``
          *compliance: mandatory -- This method must be implemented.*