gnus-define-group-parameter

gnus-define-group-parameter is a Lisp macro in `gnus.el'.

(gnus-define-group-parameter PARAM &rest REST)

Define a group parameter PARAM.
REST is a plist of following:
:type One of `bool', `list' or nil.
:function The name of the function.
:function-document The documentation of the function.
:parameter-type The type for customizing the parameter.
:parameter-document The documentation for the parameter.
:variable The name of the variable.
:variable-document The documentation for the variable.
:variable-group The group for customizing the variable.
:variable-type The type for customizing the variable.
:variable-default The default value of the variable.