val mem : 'a key -> t -> boolval add : 'a key -> 'a -> t -> tval add_if_some : 'a key -> 'a option -> t -> tval tag : unit key -> t -> tval rem : 'a key -> t -> tval find : 'a key -> t -> 'a optionval find_binding_by_name : string -> t -> binding optionval get : 'a key -> t -> 'aval get_binding_by_name : string -> t -> bindingval fold : (binding -> 'a -> 'a) -> t -> 'a -> 'aval authors : string list keyval description : string keyval homepage : string keyval licenses : string list keyval maintainers : string list keyval online_doc : string keyval synopsis : string keyval exe_name : string key