documentation bug: customization type `option'

[Roland Winkler]

Symptoms:




In GNU Emacs 21.3.50.6 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2004-06-06 on tfkp07
configured using `configure '--prefix=/nfs/common' 
'--libexecdir=/nfs/common/lib' 
'--bindir=/nfs/common/lib/emacs/21.1/bin/i686-Linux' 
'--mandir=/nfs/common/share/man' '--infodir=/nfs/common/share/info' 
'--with-gcc' '--with-pop' '--with-x' '--with-x-toolkit=athena' 
'--x-libraries=/usr/X11R6/lib''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: POSIX
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t


In bibtex.el the declaration of bibtex-user-optional-fields as a
customizable user option variable contains the custamization type
`option'. It seems to me that this custamization type is not
documented anywhere. I can't find it in the appropriate part of the
elisp manual (nodes `Simple Types' or `Composite Types') nor can I
find it in the info file for the emacs widget library.

The particular thing I want to know is whether (how) one can specify
the default value `unselected' for the checkbox of an option.

Thanks,

Roland


PS: I know, I am the maintainer of bibtex.el... But the declaration
of bibtex-user-optional-fields is due to one of my predecessors.