class type['a]
data =object
..end
method elements : string -> 'a list
add or update element
method update_element : 'a -> unit
method remove_element : string -> unit
method t_of_cvs_info : Ocvs_types.cvs_info -> 'a
method cvs_info_of_t : 'a -> Ocvs_types.cvs_info