+ @@| "" @ | @is the root@ | @
+ @@| "[.]" @ | @is an element of the submenu given by . If is omitted, this refers to an element in the root@ | @
+ @@| "[.]end" @ | @refers to the item past the last item of the submenu given by or root@ | @
+ @@| "[.]begin" @ | @refers to the first item of the submenu given by or root@ | @
+ @@| "[.]#" @ | @refers to the nth item of the submenu given by or root (n is an integer number)@ | @
+ @
+
+ Menu items can be put into groups. The path strings of each group can be obtained with the
+ "group" method. An item is put into a group by appending ":