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+type t
+
+(* TODO: For now the description is completely detached from actual
+ types and domains. Later figure out a way to represent the links
+ without strings. *)
+type multigroup_description = string BatMap.String.t
+type relation_description = string BatMap.String.t
+type tuple_description = {relation: relation_description; attributes: string BatMap.String.t}
+
+type description =
+ | Multigroup of multigroup_description
+ | Relation of relation_description
+ | Tuple of tuple_description
+
+class type implementation = object
+ method describe : unit -> (description, Concepts.Condition.condition) result
+end
+
+val make : #implementation -> Handle.protocol
+val from : Handle.t -> t Handle.interface option
+val describe : t Handle.interface -> (description, Concepts.Condition.condition) result