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(** a relation computed from other relations. [within] gives the same
relation read against another directory of relations, so a snapshot
of the tree can hand out its derived relations as they were, or as
they would be, at that moment. *)
type t
class type implementation = object
method within : Handle.t -> (Handle.t, Concepts.Condition.condition) result
end
val make : #implementation -> Handle.protocol
val from : Handle.t -> t Handle.interface option
val within : t Handle.interface -> Handle.t -> (Handle.t, Concepts.Condition.condition) result
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