@abc.abstractmethod<EOL><INDENT>def set_journal_comment(self, comment):<DEDENT>
pass<EOL>
Sets a comment.

        :param comment: the new comment
        :type comment: ``string``
        :raise: ``InvalidArgument`` -- ``comment`` is invalid
        :raise: ``NoAccess`` -- ``Metadata.isReadonly()`` is ``true``
        :raise: ``NullArgument`` -- ``comment`` is ``null``

        *compliance: mandatory -- This method must be implemented.*