@utilities.arguments_not_none<EOL><INDENT>def add_display_name(self, display_name):<DEDENT>
if self.get_display_names_metadata().is_read_only():<EOL><INDENT>raise NoAccess()<EOL><DEDENT>if not isinstance(display_name, DisplayText):<EOL><INDENT>raise InvalidArgument('<STR_LIT>')<EOL><DEDENT>self.add_or_replace_value('<STR_LIT>', display_name)<EOL>
Adds a display_name.

        arg:    display_name (displayText): 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.*