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functor Make(M : sig
type key
con id :: Name
con parent :: Name
con cols :: {Type}
constraint [id] ~ [parent]
constraint [id, parent] ~ cols
val key_inj : sql_injectable_prim key
table tab : ([id = key, parent = option key] ++ cols)
end) : sig
con id = M.id
con parent = M.parent
val tree : ($([id = M.key, parent = option M.key] ++ M.cols) -> xbody)
-> option M.key
-> transaction xbody
end
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