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.*

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())