Currently, the mime type for xbel files is
(notice the two 'l' at the end)
It should either be application/xbel or application /x-xbel
(I dunno which one of the two though :(
The only place where application/xbel is used seem to be gnome-mime-data. klibs
are using application/x-xbel.
From gnome-mime-data changelog:
2002-05-28 Ricardo Fernández Pascual <email@example.com>
* gnome-vfs.mime: Added entries for xbel, netscape and mozilla
bookmarks formats. (Modified by Bastien Nocera <firstname.lastname@example.org>,
we should use x- prefixes for non IANA mime-types)
Bastien corrected netscape/mozilla types but not xbel, I couldnt find any trace
of in the IANA mime list though.