'a
service_method
`Service
`AttachedCoservice
`NonattachedCoservice
non_ocaml_service
Eliom_registration.kind
`Registrable
Eliom_service.preapply
<select>
('a, 'b) server_function
`External
`Post
`WithSuffix
Eliom_parameter.suffix
Eliom_parameter.suffix_prod