404. That’s an error.

The requested URL /bookmarks/mark?op=edit&bkmk=https%3A%2F%2Fdata.bnf.fr%2Ffr%2F13901310%2Fiannis_xenakis%2F&title=Iannis+Xenakis+%281922-2001%29 was not found on this server. That’s all we know.