docs: def set_display_name(self, display_name):
          """Sets a display name.
  
          A display name is required and if not set, will be set by the
          provider.
  
          arg:    display_name (string): the new display name
          raise:  InvalidArgument - ``display_name`` is invalid
          raise:  NoAccess - ``Metadata.isReadonly()`` is ``true``
          raise:  NullArgument - ``display_name`` is ``null``
          *compliance: mandatory -- This method must be implemented.*
  
          """
          self._my_map['displayName'] = self._get_display_text(display_name, self.get_display_name_metadata())