johnfoconnor

-module(my_behaviour)

-export_type([my_data_type/1]).

-type my_data_type(Type) :: {ok, Type} | {error, atom()}.

-callback my_custom_function() -> my_data_type(term()).

johnfoconnor

my_app.complex_list.buzz.type = person
my_app.complex_list.buzz.age  = 25
my_app.complex_list.fido.type = dog
my_app.complex_list.fido.opts.special_value = biz

johnfoconnor

my_app.complex_list = {buzz, person}, {fido, dog}