val add :
Eliom_common.page_table_key ->
(Node.t option * (params, result) Eliom_common.service list) ->
t ->
tval find :
Eliom_common.page_table_key ->
t ->
Node.t option * (params, result) Eliom_common.service listval remove : Eliom_common.page_table_key -> t -> t