(add-to-list props 'markchars))
(font-lock-add-keywords nil markchars-used-keywords))
(font-lock-remove-keywords nil markchars-used-keywords))
(add-to-list props 'markchars))
(font-lock-add-keywords nil markchars-used-keywords))
(font-lock-remove-keywords nil markchars-used-keywords))